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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.

4Verified changes
0Upcoming cutoffs
9Affected identifiers
4Official sources

Verified August 28, 2026

Published Anthropic lifecycle changes

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

AnthropicClaude APIhigh

claude-opus-4-1-20250805: model retirement on August 5, 2026

Anthropic documents a model retirement affecting claude-opus-4-1-20250805 on August 5, 2026. The source lists claude-opus-4-8 as a replacement identifier.

model retirementSearch repositories and deployment configuration for claude-opus-4-1-20250805. The official source lists claude-opus-4-8 as a replacement identifier. Test the migration against current provider documentation before production.
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.
AnthropicClaude APIhigh

/v1/experimental/generate_prompt, /v1/experimental/improve_prompt, and 1 more: api sunset on August 17, 2026

Anthropic documents a api sunset affecting /v1/experimental/generate_prompt, /v1/experimental/improve_prompt, and 1 more on August 17, 2026. No replacement identifier passed the evidence gate.

api sunsetSearch repositories and deployment configuration for /v1/experimental/generate_prompt, /v1/experimental/improve_prompt, and /v1/experimental/templatize_prompt. No replacement identifier passed the evidence gate. Follow the linked provider documentation for the required request or behavior change.

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.