Claude Opus 4 6

Claude Opus 4.6 \ Anthropic Announcements Introducing Claude Opus 4.6 Feb 5, 2026

We’re upgrading our smartest model.

The new Claude Opus 4.6 improves on its predecessor’s coding skills. It plans more carefully, sustains agentic tasks for longer, can operate more reliably in larger codebases, and has better code review and debugging skills to catch its own mistakes. And, in a first for our Opus-class models, Opus 4.6 features a 1M token context window in beta 1 . Opus 4.6 can also apply its improved abilities to a range of everyday work tasks: running financial analyses, doing research, and using and creating documents, spreadsheets, and presentations. Within Cowork , where Claude can multitask autonomously, Opus 4.6 can put all these skills to work on your behalf. The model’s performance is state-of-the-art on several evaluations. For example, it achieves the highest score on the agentic coding evaluation Terminal-Bench 2.0 and leads all other frontier models on Humanity’s Last Exam , a complex multidisciplinary reasoning test. On GDPval-AA —an evaluation of performance on economically valuable knowledge work tasks in finance, legal, and other domains 2 —Opus 4.6 outperforms the industry’s next-best model (OpenAI’s GPT-5.2) by around 144 Elo points, 3 and its own predecessor (Claude Opus 4.5) by 190 points. Opus 4.6 also performs better than any other model on BrowseComp , which measures a model’s ability to locate hard-to-find information online. As we show in our extensive system card , Opus 4.6 also shows an overall safety profile as good as, or better than, any other frontier model in the industry, with low rates of misaligned behavior across safety evaluations. Knowledge work Agentic search Coding Reasoning Opus 4.6 is state-of-the-art on real-world work tasks across several professional domains. Opus 4.6 gets the highest score in the industry for deep, multi-step agentic search. Opus 4.6 excels at real-world agentic coding and system tasks. Opus 4.6 extends the frontier of expert-level reasoning.

In Claude Code , you can now assemble agent teams to work on tasks together. On the API, Claude can use compaction to summarize its own context and perform longer-running tasks without bumping up against limits. We’re also introducing adaptive thinking , where the model can pick up on contextual clues about how much to use its extended thinking, and new effort controls to give developers more control over intelligence, speed, and cost. We’ve made substantial upgrades to Claude in Excel , and we’re releasing Claude in PowerPoint in a research preview. This makes Claude much more capable for everyday work.

Claude Opus 4.6 is available today on claude.ai , our API, and all major cloud platforms. If you’re a developer, use claude-opus-4-6 via the Claude API . Pricing remains the same at $5/$25 per million tokens; for full details, see our pricing page .

We cover the model, our new product updates, our evaluations, and our extensive safety testing in depth below. First impressions We build Claude with Claude. Our engineers write code with Claude Code every day, and every new model first gets tested on our own work. With Opus 4.6, we’ve found that the model brings more focus to the most challenging parts of a task without being told to, moves quickly through the more straightforward parts, handles ambiguous problems with better judgment, and stays productive over longer sessions.

Opus 4.6 often thinks more deeply and more carefully revisits its reasoning before settling on an answer. This produces better results on harder problems, but can add cost and latency on simpler ones. If you’re finding that the model is overthinking on a given task, we recommend dialing effort down from its default setting (high) to medium. You can control this easily with the /effort parameter .

Here are some of the things our Early Access partners told us about Claude Opus 4.6, including its propensity to work autonomously without hand-holding, its success where previous models failed, and its effect on how teams work:

Claude Opus 4.6 is the strongest model Anthropic has shipped. It takes complicated requests and actually follows through, breaking them into concrete steps, executing, and producing polished work even when the task is ambitious. For Notion users, it feels less like a tool and more like a capable collaborator.

Early testing shows Claude Opus 4.6 delivering on the complex, multi-step coding work developers face every day—especially agentic workflows that demand planning and tool calling. This starts unlocking long-horizon tasks at the frontier.

Claude Opus 4.6 is a huge leap for agentic planning. It breaks complex tasks into independent subtasks, runs tools and subagents in parallel, and identifies blockers with real precision.

Claude Opus 4.6 is the best model we've tested yet. Its reasoning and planning capabilities have been exceptional at powering our AI Teammates. It's also a fantastic coding model – its ability to navigate a large codebase and identify the right changes to make is state of the art.

Claude Opus 4.6 reasons through complex problems at a level we haven't seen before. It considers edge cases that other models miss and consistently lands on more elegant, well-considered solutions. We're particularly impressed with Opus 4.6 in Devin Review, where it's increased our bug catching rates.

Claude Opus 4.6 feels noticeably better than Opus 4.5 in Windsurf, especially on tasks that require careful exploration like debugging and understanding unfamiliar codebases. We’ve noticed Opus 4.6 thinks longer, which pays off when deeper reasoning is needed.

Claude Opus 4.6 represents a meaningful leap in long-context performance. In our testing, we saw it handle much larger bodies of information with a level of consistency that strengthens how we design and deploy complex research workflows. Progress in this area gives us more powerful building blocks to deliver truly expert-grade systems professionals can trust.

Across 40 cybersecurity investigations, Claude Opus 4.6 produced the best results 38 of 40 times in a blind ranking against Claude 4.5 models. Each model ran end to end on the same agentic harness with up to 9 subagents and 100+ tool calls.

Claude Opus 4.6 is the new frontier on long-running tasks from our internal benchmarks and testing. It's also been highly effective at reviewing code.

Claude Opus 4.6 achieved the highest BigLaw Bench…