Acquiring Company
Anthropic
Acquired Company
Stainless
San FranciscoNew YorkInformation TechnologySoftwareArtificial IntelligenceCyber SecurityMachine LearningNatural Language ProcessingData CenterSoftwareDescription
Anthropic has acquired Stainless, a startup known for its SDK generation tools widely used in the AI sector. The acquisition aims to take key infrastructure out of reach for Anthropic's competitors. While terms of the deal remain undisclosed, reports suggest the acquisition was valued at over $300 million. Stainless's technology will now exclusively support Anthropic's AI development efforts.
Quick answer
Anthropic is acquiring Stainless, announced May 18, 2026. Anthropic is based in San Francisco, California, United States.
- How much did Anthropic pay for Stainless?
- The deal value was not disclosed.
- What does Anthropic do?
- Anthropic is an AI safety and research company that builds the Claude family of large language models and sells API and enterprise access to businesses and developers.
- Where are Anthropic and Stainless based?
- Anthropic is based in San Francisco, California, United States. Stainless is based in New York, New York, United States.
- Who are the decision-makers at Anthropic?
- Fundz holds 2 contacts at Anthropic. Names and contact details are shown to Fundz members.
Source: Fundz verified event record.
Other recent acquisitions in Cyber Security and Natural Language Processing
Deals where the buyer or target shares a sector with this one, within 45 days, from Fundz verified event records.
- Cranium AI Acquires Aiceberg for AI Security Strengthening (May 21, 2026)
- Anthropic acquires Coefficient Bio for $400M, $400M (April 3, 2026)
- TrueFoundry acquires Seldon AI for enterprise growth (June 24, 2026)
- CNTXT AI acquires Actualize for Arabic Voice AI (June 4, 2026)
- Rebellions acquires SqueezeBits for AI growth (June 30, 2026)
- Mecka AI acquires Docula for robotics data enhancement (June 29, 2026)
Who to call at Anthropic, and when
When Anthropic changes hands, the new owners review vendors, systems and leadership. That is when the door opens.
- An alert the day Anthropic raises, hires an executive or expands, scored against what you sell
- The decision-makers there, with verified emails
- Who you already know at Anthropic, from your own LinkedIn network
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Related People
Frequently asked
Who acquired Stainless?
Stainless was acquired by Anthropic, based in San Francisco. The deal was reported on May 18, 2026. Anthropic is an AI safety and research company that builds the Claude family of large language models and sells API and enterprise access to businesses and developers. Anthropic is privately held and operates in Information Technology.
When did Anthropic acquire Stainless?
Anthropic's acquisition of Stainless was reported on May 18, 2026. Anthropic has acquired Stainless, a startup known for its SDK generation tools widely used in the AI sector. The acquisition aims to take key infrastructure out of reach for Anthropic's competitors. Fundz records the date the transaction was first publicly reported, sourced from filings and company announcements.
What does Stainless do?
Stainless is a platform created by ex-Stripe staffer Alex Rattray, which assists companies in generating SDKs for their APIs. It is privately held, operating in Software, and is based in New York.
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