Introducing Claude Sonnet 4.5—the best coding model in the world.
It's the strongest model for building complex agents. It's the best model at using computers. And it shows substantial gains on tests of reasoning and math.
Claude Sonnet 4 now supports 1 million tokens of context on the Anthropic API—a 5x increase.
Process over 75,000 lines of code or hundreds of documents in a single request.
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Through MCP, Claude sees your mockup at the data level—component hierarchies, design tokens, auto-layout rules—and translates it into production-ready code.
Comparing Opus 4 to 4.1, side by side.
From sharper design mocks to smoother animations, 4.1 produces more polished outputs—with more depth and complexity.
Examples from us and the community:
Claude Desktop is now generally available.
New on Mac: Capture screenshots, click windows to share context, and press Caps Lock to talk to Claude aloud.
Introducing Claude Haiku 4.5: our latest small model.
Five months ago, Claude Sonnet 4 was state-of-the-art. Today, Haiku 4.5 matches its coding performance at one-third the cost and more than twice the speed.
We just shipped automated security reviews in Claude Code. Catch vulnerabilities before they ship with two new features:
- /security-review slash command for ad-hoc security reviews
- GitHub Actions integration for automatic reviews on every PR
Today we're launching new ways to learn in Claude Code and the Claude app.
First up: Claude Code now lets you customize communication styles with /output-style
New on our API: web fetch.
Add the web fetch tool to your requests and Claude will fetch and analyze content from any webpage URL—no additional infrastructure needed.
Today we’re introducing Claude Code Plugins in public beta.
Plugins allow you to install and share curated collections of slash commands, agents, MCP servers, and hooks directly within Claude Code.
New in Xcode 26 Beta 7: Users can now log into their Claude account from Xcode.
Generate code and documentation, automatically fix errors, and create inline playgrounds using coding intelligence features in Xcode, powered by Claude Sonnet 4.
We've published a detailed postmortem on three infrastructure bugs that affected Claude between August and early September.
In the post, we explain what happened, why it took time to fix, and what we’re changing:
This morning we announced several upgrades to Claude Code.
We also launched two new features for managing context on the Claude Developer Platform.
Here’s what’s new:
Claude Code's native installer is now generally available.
It's simpler, more stable, and doesn't require Node.js. We recommend this as the default installation method for all Claude Code users going forward.
Claude is now available in Slack.
Chat with Claude through DMs, tag @.Claude in threads, or use the AI assistant panel—with access to web search, document analysis, and your connected tools.
How (and why) agents in Claude Code help you write better code, faster:
Agents allow you to deploy specialized experts for every task. It's like managing a team rather than collaborating 1-on-1.
We’ve found and resolved two issues that were affecting quality in some Claude responses. We are continuing to monitor for any ongoing quality issues.
We're grateful to the detailed community reports that helped us identify and isolate these bugs.
Subagents in Claude Code work like a coordinated team: one debugs, another tests, another refines.
Each becomes an expert at its task, working in sequence to solve the problem at hand.
Join us tomorrow, October 4, from 9am–12pm at Air Mail newsstand in West Village, NYC.
Keep thinking.
(We're out of thinking caps today, but come back tomorrow for more caps and free coffee—available while supplies last.)
Over the last two weeks, 200+ members of r/ClaudeAI shared products, apps, and projects they’ve built with Claude.
Announcing the Built with Claude contest winners:
Claude now connects to your world on mobile.
With your permission, Claude can find nearby spots, check your calendar, and schedule events—all without leaving the app.
Well that was certainly a warm welcome.
We plan to share product updates, deep dives, and how problem solvers collaborate with Claude on this account.
What would you like to see us share more of? Artifacts? Claude Code? Mobile? MCP? Something else?
