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Anthropic releases Claude Opus 4.6 with a 1-million-token context window

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Source: Anthropic: Introducing Claude Opus 4.6

Anthropic released Claude Opus 4.6, which it said plans more carefully, sustains agentic tasks for longer and works more reliably in large codebases, and is the first Opus-class model with a 1-million-token context window, in beta. It kept pricing at $5 and $25 per million input and output tokens, and reported the top score on Terminal-Bench 2.0.

Why it matters

Developers could hand Opus whole codebases and long documents in one request at unchanged prices.

When
5 Feb 2026
ID
WTA-N-2026-0154
Who
Anthropic

Summary by wheresthe.ai, from Anthropic. Checked against the source on 9 Oct 2026.

Read the original at Anthropic

Source copy: download the page as saved on 18 Oct 2026 (PDF). Also held by the Internet Archive.

Next stop on this Storyline: What happened nextAnthropic releases Claude Sonnet 4.6 as the default for free users

Cite this story

WTA-N-2026-0154: “Anthropic releases Claude Opus 4.6 with a 1-million-token context window.” wheresthe.ai, 5 Feb 2026. https://wheresthe.ai/d/anthropic-claude-opus-4-6-release-2026-02/ (source: Anthropic: Introducing Claude Opus 4.6).

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