Anthropic has released an update to its Claude API, version 2026-10-21, which introduces breaking changes to the Messages API. These changes include the removal of `temperature`, `top_p`, and `top_k` parameters, which will now result in a 400 error. Additionally, document blocks within assistant messages and citations within user messages will also return a 400 error. Several fields in the Admin API and Enterprise Analytics API have been renamed. Developers can upgrade by sending the `anthropic-version: 2026-10-21` header or by updating to the latest major versions of the SDKs. AI
IMPACT Developers using the Claude API must update their SDKs or explicitly manage the `anthropic-version` header to avoid errors caused by parameter removals and changes in message handling.
RANK_REASON This is a technical update to an API with breaking changes, impacting developers using the service.
- Admin API
- anthropic-version
- Claude-4.7
- Claude API
- Claude Sonnet 4.6
- Enterprise Analytics API
- Messages API
- Python
- temperature
- TypeScript
AI-generated summary · Google Gemini · from 1 sources. How we write summaries →