Anthropic has released Claude Opus 4.6, the newest version of its AI model. It improves on its predecessor’s coding abilities, plans more carefully, and can sustain agentic tasks, where the AI works through multi-step problems on its own, for longer.
Anthropic says Opus 4.6 is state-of-the-art for real-world tasks, scoring highest among AI models for knowledge work. The company claims it outperforms OpenAI’s GPT 5.2, its own predecessor Opus 4.5, and Exodus.
The model now supports a one million token context window (via Claude Developer Platform), which translates to roughly 750,000 words. In practical terms, that means you could feed it an entire book, or a large stack of research documents, and ask it to retrieve specific information or work through the material.
That context window also addresses something called context rot, the tendency for AI models to lose track of information buried deep in long documents. On a test designed to measure this, where the model has to find specific details scattered across a million tokens of text, Opus 4.6 scored 76%. Its predecessor, Sonnet 4.5, scored just 18.5%.
That’s a significant jump, and it means the model is far more reliable when you’re asking it to work across large volumes of text rather than just the last few pages you fed it.
In December, Anthropic revealed that Claude Code, its coding tool, reached $1 billion in annualised revenue within six months of launch. Opus 4.6 adds the ability for Claude Code to assemble agent teams, where multiple AI agents split a larger task into parts and work on them in parallel.
The reception has been mixed on the writing front, though. WinBuzzer reports that while coding performance has improved, some early users have flagged concerns about degraded writing quality compared to the previous version, with some suggesting sticking with Opus 4.5 for writing-heavy work.
I’ve been using Claude’s Cowork feature with Sonnet 4.5 for the past few weeks to organise folders, draft documents, and run multi-step workflows, so I’m excited to put Opus 4.6 through its paces.
