---
id: "2026-02-05-claude-opus-4-6"
url: "https://postcutoff.com/e/2026-02-05-claude-opus-4-6/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2026-02-05"
date_precision: day
category: model-release
importance: 3
confidence: high
status: [Confirmed]
sources: 4
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-02-05-claude-opus-4-6/

# Anthropic releases Claude Opus 4.6 with 1M context, adaptive thinking and agent teams

Claude Opus 4.6 (`claude-opus-4-6`) was released on February 5, 2026. It brought a 1M-token context window (beta), 'adaptive thinking' that decides when to reason, and 'agent teams' in Claude Code that split large tasks across multiple agents.

## 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.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): in its training data
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [Claude Opus 4.6 System Card (PDF)](https://www-cdn.anthropic.com/14e4fb01875d2a69f646fa5e574dea2b1c0ff7b5.pdf) (www-cdn.anthropic.com, paper)
2. [TechCrunch: Opus 4.6 with new agent teams](https://techcrunch.com/2026/02/05/anthropic-releases-opus-4-6-with-new-agent-teams/) (techcrunch.com, press)
3. [CNBC: Opus 4.6 and the 'vibe working' era](https://www.cnbc.com/2026/02/05/anthropic-claude-opus-4-6-vibe-working.html) (cnbc.com, press)
4. [Introducing Claude Opus 4.6 (official video)](https://www.youtube.com/watch?v=dPn3GBI8lII) (youtube.com, video)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2026-04-16: [Anthropic releases Claude Opus 4.7, admits it trails the unreleased Mythos Preview](https://postcutoff.com/e/2026-04-16-claude-opus-4-7/index.md)
- 2026-02-17: [Anthropic releases Claude Sonnet 4.6](https://postcutoff.com/e/2026-02-17-claude-sonnet-4-6/index.md)
- Archived: 2 videos, listed in https://postcutoff.com/e/2026-02-05-claude-opus-4-6/index.json