--- title: "Anthropic’s $300M Stainless deal lands hardest on OpenAI and Google" url: https://daily.dev/posts/anthropic-s-300m-stainless-deal-lands-hardest-on-openai-and-google-mkecbo0wg source_url: https://thenewstack.io/anthropic-stainless-sdk-acquisition type: article source: "The New Stack" published: 2026-05-23T14:02:12.760Z updated: 2026-05-23T14:02:38.297Z tags: ["architecture", "openai", "anthropic"] reading_time: 10 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Anthropic’s $300M Stainless deal lands hardest on OpenAI and Google **[The New Stack](https://daily.dev/sources/newstack)** · 10 min read · 0 upvotes · 0 comments ## Summary Anthropic acquired Stainless, the SDK generation startup used by OpenAI, Google, Cloudflare, and others, for a reported $300M. Stainless will wind down its hosted SDK generator, cutting off a shared dependency that competing AI labs relied on to produce polished client libraries in multiple languages. This is the third move in a pattern: Anthropic also acquired Bun (JavaScript runtime) and OpenAI acquired Astral (Python tooling). The analysis argues frontier labs are shifting competition from model benchmarks to owning the developer toolchain layer — runtimes, package managers, and SDK generators — creating stickier distribution advantages. Affected API companies must now choose between hand-maintaining SDKs, migrating to competing generators, or building in-house tooling. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Anthropic has acquired the dev tools startup used by OpenAI, Google, and Cloudflare](https://daily.dev/posts/anthropic-has-acquired-the-dev-tools-startup-used-by-openai-google-and-cloudflare-rkx2dinzv) · TechCrunch · 0 upvotes · 0 comments - [Anthropic acquires Stainless to strengthen Claude’s developer tooling](https://daily.dev/posts/anthropic-acquires-stainless-to-strengthen-claude-s-developer-tooling-aum3ptkiv) · InfoWorld · 1 upvotes · 0 comments --- Tags: [#architecture](https://daily.dev/tags/architecture), [#openai](https://daily.dev/tags/openai), [#anthropic](https://daily.dev/tags/anthropic) [View this post on daily.dev](https://daily.dev/posts/anthropic-s-300m-stainless-deal-lands-hardest-on-openai-and-google-mkecbo0wg)