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Model provider · Claude API

Anthropic model and API lifecycle

Tracks official Anthropic model deprecations, Claude Platform release notes, and model migration guidance.

3Verified changes
1Upcoming cutoffs
6Affected identifiers
4Official sources

Action required

Upcoming Anthropic deadlines

Complete and regression-test each migration before the provider's announced cutoff.

8 days left

Claude Opus 4.1 retires on August 5, 2026

Replace the retired model ID with claude-opus-4-8 and regression-test model behavior before the cutoff.

Anthropic · Claude API

Verified July 26, 2026

Published Anthropic lifecycle changes

Exact symptoms and migration actions, linked to the official platform documentation used for verification.

AnthropicClaude APIcritical

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.
AnthropicClaude APIhigh

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.
AnthropicClaude APIhigh

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.

Official Anthropic source coverage

Change Radar monitors 4 first-party Anthropic documentation pages using a dedicated lifecycle ledger. These are the source pages used to qualify lifecycle records for publication.