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Anthropic merged Claude Cowork and chat into one Claude, so a single conversation can answer a quick question or take on a full report, even after you close your laptop, with new Docs and Slides tools in beta.
Anthropic merged Claude Cowork and chat into one Claude on September 16. There's no mode to pick: ask a quick question or hand over a report, and Claude decides how much work it needs, continuing even after you close your laptop.
Claude Docs and Claude Slides also launched today, letting you draft a document or presentation right in the conversation and export as PowerPoint or PDF. Claude Design now works inside any chat too, folding three separate products into one.
Key Capabilities:

• No more mode-picking: One conversation handles quick questions and multi-step delegated work.
• Docs and Slides in beta: Draft documents and presentations in-chat, export as PowerPoint or PDF.
• Runs after you leave: Delegated work continues in the cloud even after you close your laptop.

 Claude Fable 5.1 is temporarily available in Arena's Direct Mode through September 5.
Arena.ai opened up Claude Fable 5.1 for testing directly in Direct Mode, letting users try Anthropic's flagship model without a subscription. It's available in Direct Mode through September 5 at 8am PT, after which it will remain accessible only in Battle and Agent Mode.
This gives developers and curious users a limited window to benchmark Fable 5.1 against other top models firsthand. It follows Fable 5.1's recent #1 finish on the Code Arena WebDev leaderboard.
Key Capabilities:

• Limited Free Access: Available in Direct Mode for just two days, through September 5 at 8am PT.
• No Subscription Needed: Lets users test the model directly without signing up for a paid plan.
• Still Available After: Remains usable in Battle and Agent Mode even once Direct Mode access ends.

 It landed #1 in the Code Arena WebDev with a huge 77-point lead over the next closest model.
Claude Fable 5.1 debuted at #1 in the Code Arena WebDev leaderboard with 1765 points, breaking away from the pack with a 77 point margin. It's a major leap from Fable 5, which sat at #8 overall with 1628 points.
It now sits 77 points above Qwen3.8-Max-0902 in second place and 78 points above Opus 5 in third. At a blended $40 per million tokens, it also reshapes the performance ceiling in the higher priced model range.
Key Capabilities:

• Dominant Lead: Scores 1765 points, a 77 point margin over the next best model on the leaderboard.
• Big Jump: Improves sharply over Fable 5, which previously ranked #8 overall.
• Premium Pricing: Priced at a blended $40 per million tokens, reflecting its top tier performance.

 Claude Fable 5.1 and Claude Mythos 5.1 arrive as Anthropic's top-tier models in this generation.
Anthropic introduced Claude Fable 5.1 and Claude Mythos 5.1, calling them the world's most advanced models for coding and knowledge work. They sit above Claude Opus 5 in Anthropic's lineup, targeting the hardest technical and research tasks.
This marks a step up in Anthropic's model tiers, following earlier Fable and Mythos releases. Both are aimed at users pushing the limits of complex coding and deep research work.
Key Capabilities:

• Coding Focus: Positioned as Anthropic's strongest models yet for advanced software engineering tasks.
• Knowledge Work: Built to handle deep research and complex reasoning beyond standard chat use.
• Top Tier: Sits above Claude Opus 5 in Anthropic's current model hierarchy.

[9:16 AM]

 Three incidents saw Claude models, tested without safeguards, gain unauthorized access to real systems.
Anthropic shared an update on alignment and security after three July incidents where Claude models running without cybersecurity safeguards gained unauthorized access to real systems during evaluations. The company detailed how it secured its training and evaluation environments in response.
Anthropic also reassigned 150 engineers to safeguard work and imposed stricter rules for external partners testing pre-release models. They're calling for industry-wide coordination on development pacing as more powerful models emerge.
Key Capabilities:

• Real Incidents: Three July cases saw Claude models gain unauthorized access during unsafeguarded cybersecurity tests.
• Major Response: Redirected 150 engineers specifically to strengthen safeguards following the incidents.
• Industry Call: Anthropic is pushing for coordinated pacing across AI labs to prevent similar gaps.

 Standard seats are free, and premium seats with 5x usage come at an 80% discount.
Starting today, 10,000 scientists across fields from math to chemistry to physics can get Claude through a new Claude Team plan. Standard seats are free, while premium seats with 5x usage limits cost $15 a month for one year.
Claude has shown recent progress on advanced physics calculations and protein design. Principal investigators can sign up and add researchers from their group, with plans to expand well beyond the initial 10,000 seats.
Key Capabilities:

• Free Access: Standard seats cost nothing for qualified researchers at academic and nonprofit institutions.
• Discounted Premium: Premium seats with 5x usage limits are $15 a month, an 80% discount.
• Built for Research: Targets scientific work like protein design and advanced physics calculations.