Claude Opus 4.6

by Anthropic

Claude Opus 4.6 is a model from Anthropic, released on February 5, 2026. It has a 1M-token context window and can generate up to 128K output tokens. API pricing is $5 per 1M input tokens and $25 per 1M output tokens.

Claude Opus 4.6 is Anthropic's most intelligent model, improving on its predecessor's coding skills with more careful planning, longer agentic task sustenance, more reliable operation in larger codebases, and better code review and debugging skills. First Opus-class model with 1M token context window (beta), 128K output tokens, and adaptive thinking. Features effort controls (low/medium/high/max) and context compaction for long-running tasks. State-of-the-art on Terminal-Bench 2.0, Humanity's Last Exam, GDPval-AA, and BrowseComp. Pricing: $5/$25 per million tokens (input/output).

Key specs

ProviderAnthropic
Release date2026-02-05
Licenseproprietary
Context window1M tokens
Max output128K tokens
Input price$5 / 1M tokens
Output price$25 / 1M tokens
Intelligence Score44.5
Coding index31.6

Quick answers

What is the context window of Claude Opus 4.6?

Claude Opus 4.6 has a context window of 1M tokens, with a maximum output of 128K tokens per response.

How much does Claude Opus 4.6 cost?

Claude Opus 4.6 costs $5 per 1M input tokens and $25 per 1M output tokens through the API.

Is Claude Opus 4.6 open source?

No. Claude Opus 4.6 is a proprietary model from Anthropic (proprietary license).

When was Claude Opus 4.6 released?

Anthropic released Claude Opus 4.6 on February 5, 2026.

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