Models API Enhancements

Anthropic has expanded the Models API with capability discovery fields. The GET /v1/models and GET /v1/models/{model_id} endpoints now return max_input_tokens, max_tokens, and a capabilities object, allowing developers to programmatically discover what each model supports without manual documentation lookup.

Extended Thinking Display Control

A new display field for extended thinking gives developers finer control over response streaming. By setting thinking.display: "omitted", developers can receive thinking blocks with empty thinking content while preserving the signature field needed for multi-turn conversations. This enables faster streaming performance without sacrificing conversation continuity, and billing remains unchanged.

Developer Actions

• Update API integrations to leverage new capability fields for dynamic model selection and feature detection
• Optimize extended thinking workflows by using the display: "omitted" setting for performance-critical applications where thinking content isn't needed in the response
• Review the Controlling thinking display documentation for implementation details