Claude
@claudeai
Claude is an AI assistant built by @anthropicai to be safe, accurate, and secure. Talk to Claude on or download the app.
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A thread of early explorations with Claude Opus 5.5:
A short story about a watermelon created by @kevin_t_ngo.
One more thing: we’re increasing five-hour usage limits on Pro, Max, and Team plans. We’re also providing subscription users a rate limit reset, which you can save and use whenever you choose.
Opus 5.5 communicates more naturally, addressing some of the most common feedback we heard on Opus 5.
It puts the most important information up front and follows the writing rules you give it, which makes long sessions easier to follow.
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At its default effort setting, Opus 5.5 delivers frontier results for a fraction of the cost per task, often beating other models running at their highest settings.
It also generates output more than 30% faster than Opus 5.
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Opus 5.5 is a major step up from Opus 5, leading on agentic coding, computer use, and knowledge work.
Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family.
It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.
A thread of our favorite things people built with Claude recently:
Projects now run from one conversation, starting in Claude Code. You describe what needs doing, and Claude directs parallel threads that keep working after you close your laptop.
In beta today for select Pro and Max users in cloud sessions; coming to all Claude users soon.
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You can also now make decks, docs, and designs in your conversation.
Draft the one-pager in Claude Docs, turn it into a deck with Claude Slides, and mock up a matching visual in Claude Design, all from one place.
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Claude Cowork and chat are merging into one Claude.
Ask a quick question or hand over a report, and Claude takes it from there, even after you close your laptop. If something's unclear, Claude asks—you keep the final say.
Rolling out to Pro and Max over the next few weeks.
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Salesforce in Claude is now available in beta.
It brings your accounts, opportunities, and pipeline into Claude, with 37 pre-built sales skills. Prep a call, review a deal, create a pipeline dashboard, or send your forecast without leaving the conversation.
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Fable 5.1 Build Days start this week. The Claude community is hosting buildathons in cities all around the world from September 11–25. Bring a problem, an idea, or just show up and see what's possible.
RSVP at
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New on Claude Marketplace: @CrowdStrike, @cursor_ai, @FactoryAI, @GammaApp, and @vercel.
Enterprises can now use their Anthropic spend commitment to buy more Claude-powered products and agents.
Get started:
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Claude can now use your computer in the background in Claude Cowork and Claude Code.
Give it something to do on your desktop and Claude clicks, types, and opens apps just like you would, while you work on something else.
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Applications are open for the Claude Campus Ambassadors program. This year, we’re expanding opportunities to more students, with three tracks for undergrads, graduate students, and PhDs/postdocs.
Apply here:
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We’re also introducing Enterprise Frontier Safeguards (EFS), which give enterprise customers complete privacy (the same as zero data retention), while still being state-of-the-art at preventing adversarial use. EFS rolls out in phases, starting this fall.
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Cache reads with Fable 5.1 cost 75% less than Fable 5’s.
This reduces the cost of the model in practice by around 25% for typical workloads, and up to 45% for highly agentic ones.
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Across our benchmarks, the model sets a new standard.
It scores 52.6% on Terminal-Bench-Science 0.1, more than double Fable 5. On Terminal-Bench 4.0, it scores 55.8% against 42.0% for Fable 5.
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Fable 5.1 excels at complex, long-running tasks. And its research capabilities offer an early glimpse of how AI models will contribute to scientific progress.
