Anthropic releases Claude Opus 4.6 with 1M context, adaptive thinking and agent teams
Confirmed
The takeaway
Claude Opus 4.6 (claude-opus-4-6) was released on February 5, 2026.
Status
- Claim
Confirmed
- Our reporting
- High confidence
- Importance
- 3 of 5
- Last verified
- 29 September 2026
Your AI and this story
- GPT-6 AstraIn its training data
- Claude Opus 5.5In its training data
- Gemini 4 HydrogenIn its training data
- Grok 4.7In its training data
It happened before the cutoffs of all four assistants, so it can be in their training data.
Key facts
- Released February 5, 2026; model id claude-opus-4-6; 1M context (beta), 128K output
- Adaptive thinking replaces the manual extended-thinking toggle
- Agent teams: multiple coordinated agents for large tasks; PowerPoint integration
- SWE-bench Verified 80.8% (as the Opus 4.6 comparison figure on Anthropic’s Glasswing page)
What happened
Opus 4.6 is better at planning, code review, debugging and working in large codebases. It shipped on claude.ai, the API, Bedrock, Vertex AI and Microsoft Foundry.
Why it matters
It made 1M-token context and adaptive thinking standard features of Anthropic’s flagship line.
Sources
4 sources from 4 sites. Numbers match the chips in the text.
4 sources: 1 primary, 2 press, 1 reaction
Primary
- Claude Opus 4.6 System Card (PDF)www-cdn.anthropic.com, paper
Press
- TechCrunch: Opus 4.6 with new agent teamstechcrunch.com, press
- CNBC: Opus 4.6 and the ‘vibe working’ eracnbc.com, press
Reactions
- Introducing Claude Opus 4.6 (official video)youtube.com, video
Changes
- Filed
