Anthropic announced Monday it has acquired Stainless, a startup founded by former Stripe engineer Alex Rattray whose software is widely used by rival AI labs, including OpenAI and Google.
Anthropic didn’t disclose terms of the deal. However, The Information reported last week that the company was in talks to acquire Stainless, which is backed by Sequoia Capital and Andreessen Horowitz, for more than $300 million.
The acquisition will take a key infrastructure supplier out of the hands of Anthropic’s competitors. The company told TechCrunch it will wind down all hosted Stainless products, including its SDK generator. An Anthropic spokesperson said Stainless customers will still own the SDKs they’ve generated to date and have full rights to modify and extend them however they wish.
The New York-based startup, founded in 2022, rose to prominence in the emerging AI industry for automating the creation and maintenance of software development kits, or SDKs — the libraries developers use to interact with APIs.
Rattray developed software that could take API specifications and turn them into production-ready SDKs across multiple programming languages, including Python, TypeScript, Kotlin, Go, and Java. It became a popular tool because the platform automatically updates the SDKs as APIs change and eliminated the time-consuming process of manually maintaining them.
The technology is particularly valuable to companies like Anthropic, OpenAI, Google, Replicate, Runway, and Cloudflare that are building AI agents that can connect to external software and complete tasks on behalf of users. Stainless’s SDK tools are an easy way to build and maintain those connections — but going forward, the tools will only be available to Anthropic, not its competitors.
According to Anthropic, Stainless software has powered the generation of every official Anthropic SDK since the earliest days of its API.
“I started Stainless because SDKs deserve as much care as the APIs they wrap,” Rattray said in a press release posted Monday. “Anthropic was one of the first teams to bet on this with us. We have been watching what developers have built on Claude over the last few years, which made bringing our teams together an easy decision. The team gets to keep doing the work we love, on the platform where it matters most.”
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Frequently Asked Questions
Anthropic announced it has acquired Stainless, a startup founded by former Stripe engineer Alex Rattray, with The Information reporting talks of a price over $300 million.
Stainless automated the creation and maintenance of SDKs, turning API specs into production-ready SDKs in Python, TypeScript, Kotlin, Go and Java, automatically updating them as APIs change.
The acquisition takes a key infrastructure supplier out of competitors' hands, including OpenAI and Google who also used it.
Anthropic says it will wind down all hosted Stainless products including the SDK generator, but existing customers keep full rights to the SDKs they've generated.
