Releasesby IbisCode written for Claude Haiku 4.5 can break on Claude Haiku 5.5
UpdateyesterdayUnverifiedAdded Oct 8, 2026
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.
Topics: LLMs, Developer tools
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