Just got a nice DM from a big enterprise customer using Claude Code in one of the world's biggest codebases Here's how we made @-mentions 3x faster in large enterprise codebases
@bcherny
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Custom Rust File Indexer for Claude Code @-mentions via NAPI
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To power file @-mentions in Claude Code, we used to use a custom Rust-based file indexer that we invoked from Claude Code via NAPI. It was pretty fast.
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Claude Cowork Now Generally Available
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Claude Cowork, now generally available! https://t.co/y0gDkmyYRg
— Boris Cherny (@bcherny) 9 avril 2026Claude Cowork, now generally available!
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Mythos Model: Powerful AI Preview with Cyber Defenders
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Mythos is very powerful, and should feel terrifying. I am proud of our approach to responsibly preview it with cyber defenders, rather than generally releasing it into the wild. Model card here: https://
www-cdn.anthropic.com/53566bf5440a10
affd749724787c8913a2ae0841.pdf
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Claude Code Drives Exponential Growth in Engineering Velocity at Anthropic
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Appreciate the feedback. Since we introduced Claude Code at Anthropic, engineering velocity has increased hundreds of %, and the rate at which it is increasing is itself accelerating. The velocity is very much not performative — we're actively trying to figure out how to
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Invalid API Key in Environment Variable Precedence Mode
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It is also possible you have an invalid api key set in an env var, and in -p mode that takes precedence
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Refining Abuse Detection Systems and Technical Terminology
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We think this is an overactive abuse-detection system, digging in. Also working on making the terms for -p crystal clear.
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Token efficiency improvements enable extended AI sessions
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We've been landing token-efficiency improvements so you can do more in your sessions. If you have a session where usage felt particularly high, can you run /bug and post the feedback id? Feel free to tag me directly
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Report AI Model Changes and Behavioral Issues
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Hmm there were no behavioral/model changes recently. If you see something weird (eg. the model refusing to do something) mind running /bug and posting the feedback id? Feel free to tag me
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Overactive AI abuse classifier requires policy clarification
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This is not intentional, likely an overactive abuse classifier. Looking, and working on clarifying the policy going forward.