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2026-03-11-gpt-5-4-phase-labels.md

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2026-03-11-gpt-5-4-phase-labels.md

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Support GPT-5.4 with phase labels; deprecate GPT-5.2

  • Date: 2026-03-11
  • Type: feature
  • Scope: gpt5_4, types, auto_client, base_client, llmsdk_docs
  • PR: #87

中文版

What changed

  • GPT-5.4 is supported via the Responses API (#87).
  • Assistant messages now carry phase labels, which are preserved and sent back to the server on replay.
  • GPT-5.2 is deprecated.

Backfilled when the changelog was reorganized by release version; see the git history of the release range for full context.