Gemini 3 Advent Calendar 2025

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Category：AI & ML & Data Science

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@tsuzuki_takaaki

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2025年11月、Google から新しい AI モデルである「Gemini 3」が発表されました！

そして、同時に AI IDE である「Google Antigravity」もリリースされました！

このカレンダーは、「Gemini 3」と「Google Antigravity」に関する話題を扱う Advent Calendar です！

技術的な深掘りはもちろん、他ツールとの比較、トラブルシューティング、そして純粋な体験レポートも大歓迎です！

How to join the calendar

You can join the calendar by selecting an available date and registering the URL of the article you wish to link to. If a slot is available, you can go back to a past date to join!

Series 1

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@inukai-masanori 「純全帯幺九（ジュンチャン）、難易度の割に安すぎないか？」という麻雀の疑問をGemini 3に聞いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Isaka-code Nano Banana Proは画像からフォーマットそのままで翻訳することができる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Takaraya Gemini3の評価をChatGPTに聞いてみた（ポエム） Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ELIXIR [TRPGリプレイ風] Antigravityとの開発風景 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Yukidarusan 【脱・予約忘れ Vol.3】GASの中に「キャンプ専用Gem」を埋め込む。最新Gemini 3.0 Proで完全自動化へ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ohakutsu GeminiアプリでGoogleのAIが生成した画像かどうかを見分けれるようになったので試す Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@hchonan 素の状態のGemini 3 Proは、現代社会に適合できるのか？ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@shibuchaaaan Antigravityのブラウザ連携に感動した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kuromoriken AntigravityでAntigravity（SNS）を作った Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@P-SiZK 何か書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiでハリネズミと遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Isaka-code 【初心者向け🔰】最新のAIモデルを手軽に評価する方法5選 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tsuzuki_takaaki 何か書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@nori-channel Geminiでコジカと遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Isaka-code LLM API関連 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiでコグマと遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiで子猫と遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ELIXIR Antigravityでイラスト迷路アプリを作ってみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiで子犬と遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiでウマと遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
Join calendar on 21 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Isaka-code Article2Image Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 23 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 24 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 25 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@inukai-masanori
「純全帯幺九（ジュンチャン）、難易度の割に安すぎないか？」という麻雀の疑問をGemini 3に聞いてみた。
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@Isaka-code
Nano Banana Proは画像からフォーマットそのままで翻訳することができる
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@Takaraya
Gemini3の評価をChatGPTに聞いてみた（ポエム）
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@ELIXIR
[TRPGリプレイ風] Antigravityとの開発風景
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@Yukidarusan
【脱・予約忘れ Vol.3】GASの中に「キャンプ専用Gem」を埋め込む。最新Gemini 3.0 Proで完全自動化へ
Overwrite
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@ohakutsu
GeminiアプリでGoogleのAIが生成した画像かどうかを見分けれるようになったので試す
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@hchonan
素の状態のGemini 3 Proは、現代社会に適合できるのか？
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@shibuchaaaan
Antigravityのブラウザ連携に感動した話
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@kuromoriken
AntigravityでAntigravity（SNS）を作った
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@P-SiZK
何か書きます
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@nori-channel
Geminiでハリネズミと遊ぶ魔法少女を描いてみた。
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@Isaka-code
【初心者向け🔰】最新のAIモデルを手軽に評価する方法5選
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@tsuzuki_takaaki
何か書きます
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@nori-channel
Geminiでコジカと遊ぶ魔法少女を描いてみた。
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@Isaka-code
LLM API関連
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@nori-channel
Geminiでコグマと遊ぶ魔法少女を描いてみた。
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@nori-channel
Geminiで子猫と遊ぶ魔法少女を描いてみた。
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@ELIXIR
Antigravityでイラスト迷路アプリを作ってみた
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@nori-channel
Geminiで子犬と遊ぶ魔法少女を描いてみた。
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@nori-channel
Geminiでウマと遊ぶ魔法少女を描いてみた。
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Join calendar on 21 day
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@Isaka-code
Article2Image
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Join calendar on 25 day
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Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@inukai-masanori 「純全帯幺九（ジュンチャン）、難易度の割に安すぎないか？」という麻雀の疑問をGemini 3に聞いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Isaka-code Nano Banana Proは画像からフォーマットそのままで翻訳することができる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Takaraya Gemini3の評価をChatGPTに聞いてみた（ポエム） Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ELIXIR [TRPGリプレイ風] Antigravityとの開発風景 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Yukidarusan 【脱・予約忘れ Vol.3】GASの中に「キャンプ専用Gem」を埋め込む。最新Gemini 3.0 Proで完全自動化へ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ohakutsu GeminiアプリでGoogleのAIが生成した画像かどうかを見分けれるようになったので試す Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@hchonan 素の状態のGemini 3 Proは、現代社会に適合できるのか？ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@shibuchaaaan Antigravityのブラウザ連携に感動した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kuromoriken AntigravityでAntigravity（SNS）を作った Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@P-SiZK 何か書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiでハリネズミと遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Isaka-code 【初心者向け🔰】最新のAIモデルを手軽に評価する方法5選 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tsuzuki_takaaki 何か書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@nori-channel Geminiでコジカと遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Isaka-code LLM API関連 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiでコグマと遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiで子猫と遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ELIXIR Antigravityでイラスト迷路アプリを作ってみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiで子犬と遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nori-channel Geminiでウマと遊ぶ魔法少女を描いてみた。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
Join calendar on 21 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Isaka-code Article2Image Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 23 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 24 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 25 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@inukai-masanori
「純全帯幺九（ジュンチャン）、難易度の割に安すぎないか？」という麻雀の疑問をGemini 3に聞いてみた。
Overwrite
Title
URL
You can post either your article on Qiita or your blog post.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
@Isaka-code
Nano Banana Proは画像からフォーマットそのままで翻訳することができる
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URL
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About reserved posting
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@Takaraya
Gemini3の評価をChatGPTに聞いてみた（ポエム）
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@ELIXIR
[TRPGリプレイ風] Antigravityとの開発風景
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@Yukidarusan
【脱・予約忘れ Vol.3】GASの中に「キャンプ専用Gem」を埋め込む。最新Gemini 3.0 Proで完全自動化へ
Overwrite
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About reserved posting
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@ohakutsu
GeminiアプリでGoogleのAIが生成した画像かどうかを見分けれるようになったので試す
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@hchonan
素の状態のGemini 3 Proは、現代社会に適合できるのか？
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URL
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About reserved posting
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@shibuchaaaan
Antigravityのブラウザ連携に感動した話
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@kuromoriken
AntigravityでAntigravity（SNS）を作った
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@P-SiZK
何か書きます
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@nori-channel
Geminiでハリネズミと遊ぶ魔法少女を描いてみた。
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@Isaka-code
【初心者向け🔰】最新のAIモデルを手軽に評価する方法5選
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@tsuzuki_takaaki
何か書きます
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@nori-channel
Geminiでコジカと遊ぶ魔法少女を描いてみた。
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@Isaka-code
LLM API関連
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@nori-channel
Geminiでコグマと遊ぶ魔法少女を描いてみた。
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@nori-channel
Geminiで子猫と遊ぶ魔法少女を描いてみた。
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@ELIXIR
Antigravityでイラスト迷路アプリを作ってみた
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@nori-channel
Geminiで子犬と遊ぶ魔法少女を描いてみた。
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@nori-channel
Geminiでウマと遊ぶ魔法少女を描いてみた。
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Join calendar on 21 day
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@Isaka-code
Article2Image
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Gemini 3 Advent Calendar 2025

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