2026-10-07 · America/Los_Angeles · 官方发布 · #14

Code written for Claude Haiku 4.5 can break on Claude Haiku 5.5.

Code written for Claude Haiku 4.5 can break on Claude Haiku 5.5. Manual extended thinking (budget_tokens) returns a 400 error, and adaptive thinking is on by default, so a response can begin with thinking blocks. The same text also counts as more tokens. See the migration guide. For model-specific prompting patterns, see Prompting Claude Haiku 5.5.

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