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Claude Sonnet 5 vs GPT-5.4 API Comparison

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Claude Sonnet 5 vs GPT-5.4 API Comparison

This is a production-focused integration note based on live Crazyrouter API tests from 2026-07-02.

What was verified

  • claude-sonnet-5 appeared in GET /v1/models and returned visible output.
  • gpt-5.4 and claude-sonnet-5 both returned HTTP 200 through https://cn.crazyrouter.com/v1/chat/completions.
  • GPT-5.4 returned compact raw JSON in the structured test.
  • Claude Sonnet 5 returned valid JSON content inside a markdown fence.
  • The GPT-5.4 smoke test showed one unusually high prompt-token reading, so repeat measurement before cost decisions.

Full article: https://crazyrouter.com/blog/claude-sonnet-5-vs-gpt-5-4-comparison-2026?utm_source=qiita&utm_medium=article&utm_campaign=sonnet5_gpt54_20260702&utm_content=qiita_claude-sonnet-5-vs-gpt-5-4-comparison-2026_20260702__canonical&utm_term=Claude%20Sonnet%205%20vs%20GPT-5.4

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