These bundled files could contain everything from additional markdown instructions to image assets to code scripts that Claude can execute. Since Skills are just folders, they can accommodate any file type!
@alexalbert__
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Skills: Simple Folders for Specializing Claude Without Custom Agents
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At their core, Skills are simple. They're just a folder with a http://
SKILL.md file. The file starts with a name and description, then contains instructions, code, and resources. This simplicity means anyone can now specialize Claude without building custom agents. -
Skills: Loading Specialized Knowledge into General Agents at Runtime
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At a high level, the best analogy I've heard for Skills is something like Neo learning Kung Fu in seconds in the Matrix. We're "loading in" specialized knowledge to our general agents at runtime.
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Introducing Skills in Claude: Reusable Capabilities for Agents
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Today we're introducing Skills in claude dot ai, Claude Code, and the API. Skills let you package specialized knowledge into reusable capabilities that Claude loads on demand as agents tackle more complex tasks. Here's how they work and why they matter for the future of agents:
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Guidance on Model Selection and Extra Usage Options for Opus Users
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We'll put together more guidance on choosing between our models in the coming weeks. We've also made it possible for Opus users on the Max 20x plan to purchase extra usage, if needed. Keep the feedback coming! We want our models and products to work well for you.
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Sonnet 4.5 Launch: Limits Reset for Paid Users
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The response to Sonnet 4.5 has been incredible. We've also seen some people hitting weekly limits, particularly if you're using Opus. We've just reset limits for all paid users to give everyone a fresh start with Sonnet 4.5.
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AI Models Now Enable Researchers to Replicate Economic Studies Independently
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Models are good enough now to start significantly speeding up researchers across fields. Sonnet 4.5 using the code execution and file creation feature in claude dot ai was able to replicate all the experiments in a published econ paper just from the raw data.
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Claude Sonnet 4.5 : une mise à jour supérieure au même prix
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If you're using Claude anywhere – apps, API, Claude Code – you should upgrade to Sonnet 4.5. It's a drop-in replacement for Sonnet 4, same price, significantly better across the board.
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Sonnet 4.5 Achieves Major Breakthrough in Computer Use Capabilities
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Sonnet 4.5 crushes it on computer use too. 61.4% on OSWorld, which is a 19.2% jump over Sonnet 4. This is the first time computer use has crossed into "actually useful for me personally" territory, especially when used in the Claude Chrome Extension.