Models API Enhancement

The Claude Platform has updated the Models API to expose comprehensive model capability information. Developers can now query model metadata programmatically rather than relying on static documentation.

What's New

The GET /v1/models and GET /v1/models/{model_id} endpoints now return:

• max_input_tokens: Maximum input context window for the model
• max_tokens: Maximum output token generation limit
• capabilities object: Structured data describing what features each model supports

Developer Impact

This enables dynamic model selection and capability checking at runtime. Rather than hardcoding assumptions about model features, applications can query the API to discover:

• Which models support extended thinking
• Token limits for batching or context management
• Feature availability before making requests

This is particularly valuable for applications that need to adapt behavior based on available model capabilities or that need to select optimal models for specific workloads.