Sonnet 4.5's character has also improved significantly. Its responses are more to the point with less LLM fluff. We've tuned the model across a bunch of dimensions – sycophancy, deception, prompt injection robustness. You'll notice it in how the model actually talks to you.
@alexalbert__
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Sonnet 4.5 Achieves 82% on SWE-bench with Test-Time Compute
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Sonnet 4.5 hits 82% on SWE-bench with test-time compute. We're adding another dot to what's been a pretty clean exponential toward saturating SWE-bench as a benchmark. At this rate we'll need new evals soon, but it's still a useful signal that the capability curve is holding.
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Claude Sonnet 4.5: Advanced Coding Model with Superior Design
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Introducing Claude Sonnet 4.5. The best coding model in the world combined with the best character of any model I've seen.
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Anthropic API Public Beta Release Available Today
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Available today in public beta on the Anthropic API. Docs here:
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How Claude Automatically Cites Search Results with Sources
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Here's how it works: You give Claude search results with a source, title, and content. When Claude uses that information, it automatically includes citations showing exactly which source and text it's referencing.
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Anthropic API launches search result content blocks with citations
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We shipped a new feature in the Anthropic API today: Search result content blocks. This enables natural citations with proper source attribution for all RAG content, bringing web search-quality citations to your custom search tools.
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Getting Started with Claude Code Hooks and Customization
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Read the docs to get started with hooks and further customize Claude Code: https://
docs.anthropic.com/en/docs/claude
-code/hooks
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Create hooks in Claude Code with event triggers and commands
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To create a hook, run the /hooks command within Claude Code. Select the kind of hook event (when you want the action triggered), then define the hook command. pic.twitter.com/v9lScTYVw5
— Alex Albert (@alexalbert__) 2 juillet 2025To create a hook, run the /hooks command within Claude Code. Select the kind of hook event (when you want the action triggered), then define the hook command.
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Hooks: User-Defined Shell Commands for Claude Code Agent Control
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Hooks are user-defined shell commands that execute at various points in Claude Code’s agent loop. They give you deterministic control over Claude Code’s behavior to ensure certain actions always happen at certain times.
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Claude Code Update: New Hooks Feature for Workflow Customization
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We’ve rolled out another update to Claude Code to help customize your workflows: Hooks. pic.twitter.com/iauuvFRHo9
— Alex Albert (@alexalbert__) 2 juillet 2025We’ve rolled out another update to Claude Code to help customize your workflows: Hooks.