Claude Opus 5.5 by Anthropic: Pricing, Context Window & Specs

Specifications

Claude Opus 5.5 specs

Provider: Anthropic
Type: API model
Model ID: anthropic/claude-opus-5.5
Context window: 1,000,000 tokens1M
Input price: $4per 1M input tokens
Output price: $20per 1M output tokens
Accepts: file, image, text
Produces: text
Released: Sep 22, 2026
Popularity: 47/100position #6 in OpenRouter's weekly usage ranking
Source: OpenRouter

Overview

About Claude Opus 5.5

Claude Opus 5.5 is an API model from Anthropic, released on Sep 22, 2026, with a context window of 1,000,000 tokens, pricing of $4 per million input tokens and $20 per million output tokens. It accepts file, image, text input and produces text output.

At listed prices, a request with 10,000 input tokens and 1,000 output tokens costs about $0.06.

Specs are sourced from OpenRouter and were last checked on Nov 3, 2026. Always confirm current pricing and limits with the provider before production use.

Tool callingStructured outputsJSON modeReasoning

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FAQ

Claude Opus 5.5 questions

What is the context window of Claude Opus 5.5?

Claude Opus 5.5 supports a context window of 1,000,000 tokens.

How much does Claude Opus 5.5 cost?

Claude Opus 5.5 is listed at $4 per million input tokens and $20 per million output tokens on OpenRouter.

When was Claude Opus 5.5 released?

Claude Opus 5.5 was published on Sep 22, 2026.

What inputs does Claude Opus 5.5 accept?

Claude Opus 5.5 accepts file, image, text input and produces text output.