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3 records from Anthropic.
Claude Opus 4.1 retires on August 5, 2026
Anthropic is retiring Claude Opus 4.1 on the Claude API and recommends Claude Opus 4.8 as its replacement.
model retirementUpdate the model ID to claude-opus-4-8, then rerun prompt, tool-use, latency, and output-quality tests before August 5.
Claude Opus 4.7 and later reject non-default sampling parameters
Anthropic has deprecated temperature, top_p, and top_k on Claude Opus 4.7 and later; non-default values return an HTTP 400 error.
breaking behaviorStop sending temperature, top_p, and top_k for affected models. Express tone, variability, and formatting requirements in the system prompt instead.
Claude Sonnet 5 changes thinking defaults and token counts
Claude Sonnet 5 enables adaptive thinking by default, removes manual thinking budgets, rejects non-default sampling parameters, and tokenizes the same text into roughly 30% more tokens.
breaking behaviorRemove manual thinking budgets and non-default sampling parameters, rely on adaptive thinking, and use Anthropic's token-counting API to recalibrate limits and cost controls.