Model Drop

Claude Opus 4.6

February 5, 2026 2 min read

Claude Opus 4.6, which Anthropic shipped on February 5, 2026, is an upgrade to Anthropic's flagship model that plans more carefully, keeps agents going longer and adds a 1M-token context window in beta.

Model: Claude Opus 4.6 (claude-opus-4-6)
Maker: Anthropic
Ship date: February 5, 2026
Pricing: $5 / $25 per M tokens
Context: 200K tokens (1M in beta on the Claude API)
Where you can use it:
- Claude.ai, Cowork and the Claude apps
- Claude Code and the Claude API
- All major cloud platforms
When to reach for it:
- Long-running agents in big codebases
- Finance, research and office documents
- Skip it for quick, simple prompts
How it compares:
- Beats GPT-5.2 on knowledge-work tasks
- Roughly tied with GPT-5.2 at bug fixing
What makes it different:
- First Opus with a 1M-token context (beta)
- Adaptive thinking picks its own depth
Early reactions: Early testers called it very strong but struggled to find tasks Opus 4.5 couldn't already handle.
Read more: Introducing Claude Opus 4.6, Claude Opus 4.6 system card

The benchmarks

Anthropic ran Opus 4.6 with adaptive thinking at max effort, averaged over 5 trials (25 for SWE-bench Verified; BrowseComp at max effort with thinking off), against Claude Opus 4.5, Claude Sonnet 4.5, Gemini 3 Pro and the best reported GPT-5.2 variant (often GPT-5.2 Pro); Terminal-Bench 2.0 rival scores are Anthropic's reruns (GPT-5.2 in OpenAI's Codex CLI), and GDPval-AA was run independently by Artificial Analysis.

Anthropic's numbers

Terminal-Bench 2.0 (command-line agent tasks): 65.4%. +0.7 over GPT-5.2 (64.7%), +9.2 over Gemini 3 Pro (56.2%), +5.6 over Claude Opus 4.5 (59.8%).
SWE-bench Verified (real GitHub fixes): 80.8%. +0.8 over GPT-5.2 (80.0%), +4.6 over Gemini 3 Pro (76.2%), −0.1 under Claude Opus 4.5 (80.9%).
OSWorld-Verified (operating a computer): 72.7%. +6.4 over Claude Opus 4.5 (66.3%), +11.3 over Claude Sonnet 4.5 (61.4%).
BrowseComp (hard web research): 84.0%. +6.1 over GPT-5.2 Pro (77.9%), +24.8 over Gemini 3 Pro Deep Research (59.2%), +16.2 over Claude Opus 4.5 (67.8%).
Humanity's Last Exam (no tools) (expert questions): 40.0%. +3.4 over GPT-5.2 Pro (36.6%), +2.5 over Gemini 3 Pro (37.5%), +9.2 over Claude Opus 4.5 (30.8%).
GDPval-AA (office work, Elo): 1606. +144 over GPT-5.2 (1462), +190 over Claude Opus 4.5 (1416), +411 over Gemini 3 Pro (1195).
ARC-AGI-2 (novel visual puzzles): 68.8%. +14.6 over GPT-5.2 Pro (54.2%), +23.7 over Gemini 3 Deep Think (45.1%), +31.2 over Claude Opus 4.5 (37.6%).
GPQA Diamond (grad-level science): 91.3%. +4.3 over Claude Opus 4.5 (87.0%), −0.6 under Gemini 3 Pro (91.9%), −1.9 under GPT-5.2 Pro (93.2%).

Independent numbers

Artificial Analysis Intelligence Index (current v4.3.2, AA estimate): 31.9. +1.5 over GPT-5.2 (xhigh) (30.4), +3.9 over Gemini 3 Pro (28.0).
ARC-AGI-1 (ARC Prize, max effort): 93.00%. +6.83 over GPT-5.2 (xhigh) (86.17%), +18.00 over Gemini 3 Pro (75.00%).