Claude models overview

Summary

Anthropic's reference page for current Claude models: model IDs, context windows, output limits, and API prices. Figures below were captured on 2026-10-04 from a reference dated 2026-09-25.

Key points

• Claude Fable 5.1 (claude-fable-5-1): most capable widely released model; 1M context, 128K output; $10 / $50 per million input / output tokens.
• Claude Opus 5.5 (claude-opus-5-5): current Opus; 1M context, 128K output; $4 / $20.
• Claude Sonnet 5.5 (claude-sonnet-5-5): current Sonnet; 1M context, 128K output; $2 / $10.
• Claude Haiku 4.5 (claude-haiku-4-5): smallest current model; 200K context; $1 / $5.
• Claude Mythos 5.1 is limited to Anthropic's Project Glasswing programme.
• The Models API (GET /v1/models) returns live context window, output cap, and capabilities.

Why it matters

Primary source for Claude model facts; prices and lineups change, so check it before relying on the numbers above.