Summary

Suppress the Anthropic temperature request parameter for Claude Opus 4.7+ models.

Anthropic rejects non-default temperature values for these models with:

400 `temperature` is deprecated for this model.

pi does not set temperature by default, but programmatic callers and extensions can still pass temperature. This change prevents avoidable Anthropic 400s in that path.

Reference:

• https://platform.claude.com/docs/en/about-claude/models/migration-guide#migrating-to-claude-opus-47

Changes

• Add supportsTemperature?: boolean to AnthropicMessagesCompat.
• Default supportsTemperature to true in the Anthropic compat layer.
• Mark Claude Opus 4.7/4.8 Anthropic Messages models as supportsTemperature: false in generated metadata.
• Omit temperature when supportsTemperature is false.
• Add payload regression tests.

Test made:

• cd packages/ai && node ../../node_modules/vitest/dist/cli.js --run test/anthropic-temperature-compat.test.ts
• npm run check