Anthropic

Claude Opus 4.1 generation model. Note higher pricing ($15/$75 per MTok) compared to later Opus 4.x models.

Claude Opus 4.5 generation model. Active and supported.

Anthropic's strongest model for coding and long-running professional tasks. Built for agents that operate across entire workflows rather than single prompts. Especially effective for large codebases, complex refactors, and multi-step debugging. Supports up to 300k output tokens via Message Batches API with the output-300k-2026-03-24 beta header.

Most capable generally available model for complex reasoning and agentic coding. Features a new tokenizer (compared to previous models) that may use up to 35% more tokens for the same fixed text. Includes a step-change improvement in agentic coding over Opus 4.6. Supports up to 300k output tokens via Message Batches API with the output-300k-2026-03-24 beta header.

Claude Sonnet 4.5 generation model. Supports global and regional endpoints on Bedrock and Vertex AI.

Best combination of speed and intelligence. Most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. Supports extended thinking and up to 300k output tokens via Message Batches API with the output-300k-2026-03-24 beta header.

Fastest model with near-frontier intelligence. Ideal for high-volume, cost-sensitive tasks. Supports extended thinking. Supports global and regional endpoints on Bedrock and Vertex AI.