Claude Opus 5.5

Anthropic · released 22 Sept 2026

Input$4per 1M tokens

Output$20per 1M tokens

Context1,000Ktokens

WeightsClosed

context on a 1K–2M scale

About

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...

Details

Lab: Anthropicopenrouter.ai · 3 Oct 2026
Context: 1,000Kopenrouter.ai · 3 Oct 2026
Input price: $4 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $20 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 128,000 tokensopenrouter.ai · 3 Oct 2026
Inputs: text, image, fileopenrouter.ai · 3 Oct 2026
Open weights: Noopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/anthropic/claude-opus-5.5· checked 3 Oct 2026