fix(anthropic): implement temperature/topP mutual exclusivity#11458
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Resolves the Anthropic API breaking change where sampling parameters must use only temperature OR top_p, not both. When both parameters are provided, temperature takes priority and topP is ignored with a warning message.
lgrammel
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lgrammel
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Jan 5, 2026
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…els (#14052) ## Background The `@ai-sdk/anthropic` provider enforces temperature/topP mutual exclusivity for all models (#11458), matching a constraint in the Anthropic API. However, providers like Minimax use the Anthropic-compatible API endpoint with non-Anthropic models (e.g. `MiniMax-M2.7`) that require both `temperature` and `top_p` to be set simultaneously. The SDK currently drops `topP` whenever both are provided, with no way to override this behavior. ## Summary - Renamed `isKnownModel` to `isKnownAnthropicModel` for clarity - Updated the fallback in `getModelCapabilities` to return `true` for unknown models whose ID starts with `claude-` (forward-compatible with future Anthropic models) - Added `isKnownAnthropicModel` as a guard for the temperature/topP mutual exclusivity check — non-Anthropic models using the Anthropic-compatible API can now send both parameters ## Manual Verification Created a test using a non-Anthropic model ID (`MiniMax-M2.7`) that verifies both `temperature` and `top_p` are sent in the request body without warnings.
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Background
Anthropic introduced a breaking change in their API requiring that sampling parameters use only
temperatureORtop_p, not both. This aligns with their Claude 4 migration guidelines.Previously, the AI SDK Anthropic provider would send both parameters to the API when both were specified, which would result in an API error with the new Anthropic API requirements.
See: https://platform.claude.com/docs/en/about-claude/models/migrating-to-claude-4
Summary
This PR implements mutual exclusivity between
temperatureandtopPparameters in the Anthropic provider:Changes:
temperatureandtopPare provided:temperaturetakes prioritytopPis set toundefinedand excluded from the API requestFiles Modified:
packages/anthropic/src/anthropic-messages-language-model.ts(lines 436-446)packages/anthropic/src/anthropic-messages-language-model.test.tsManual Verification
Test Suite Verification: All 235 tests pass, including:
Expected Behavior:
temperatureis provided → sends temperature to API ✅topPis provided → sends topP to API ✅Checklist
pnpm changesetin the project root)Related Issues
Resolves the Anthropic API breaking change for Claude 4 parameter requirements.