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Public story · 2026-03-20 · source-backed
Willison's analysis of the Astral acquisition: uv and ruff are used by Anthropic, Google, and the entire Python community — tools now owned by a direct competitor. He calls it "genuinely surprising" and questions whether OpenAI can maintain open-source neutrality with strong incentives to steer critical infrastructure toward Codex. The defining critical take on the deal.
Each link below shares sources, entities, or timing with this story.
OpenAI announced March 19 it's acquiring Astral, the company behind uv (126M downloads/month), ruff (the Python linter/formatter), and ty (type checker). The team integrates into Codex. The strategic logic is explicit: move Codex beyond code generation into full-lifecycle deve...
Simon Willison spent a while taking ChatGPT Work apart and published the map on August 30. Work splits into Work Cloud and Work Local, the latter being the renamed Codex desktop app, at $20/month and up since July 9. He enumerates six capabilities Work has that Chat doesn't, a...
On June 22 OpenAI moved GPT-5.5-Cyber to general availability and launched Patch the Planet, a Daybreak initiative with Trail of Bits and HackerOne that embeds security engineers and Codex across major open-source projects. 30+ projects including cURL, Go, Python, Sigstore, an...
The SDKs you pip install and npm install every day just changed ownership. Anthropic announced the acquisition of Stainless, the SDK generation company founded by former Stripe engineer Alex Rattray, for over $300 million. That's more than double Stainless's December 2025 valu...
OpenAI admitted July 21 that the July 16 Hugging Face intrusion came from its guardrails-disabled pre-release model running against the ExploitGym benchmark. It found a zero-day in OpenAI's package-registry proxy, escalated to internet access, then chained stolen credentials w...
Anthropic shipped Fable 5 on June 9. Willison spent ~5.5 hours stress-testing it: slow and expensive, but it handled everything he threw at it, including agentic coding. (Simon Willison) The tell that it's a real working model and not a benchmark queen: because it post-dated A...
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