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Stainless | Cold Start

Checked May 18 2026

Stainless

Stainless automates the generation and maintenance of idiomatic, multi-language SDKs from API specifications, serving API-first companies that need production-ready client libraries without dedicating engineering headcount to SDK upkeep.

stainless.comChecked May 18 202616 cited sources

Source mix1 independent6 reported6 company1 data vendor2 unclassified

Raised$25MCorroborated[2]+2

Last roundSeries A · $25MCorroborated[2]+2

FoundersAlex RattrayCorroborated[2]+2

HQNew York, United StatesCorroborated[3]+1

Headcount67 · Apr 2026Reported[2]

Founded2022Reported[4]

Evidence notes

Who uses it: API-first companies (AI labs, fintech, cloud infrastructure) whose developer-experience teams own SDK quality but lack the bandwidth to hand-craft and maintain libraries across multiple languages; the budget sits with engineering or developer-relations...[2]+3Reported
Public signals: Anthropic acquires Stainless for over $300M, will wind down hosted SDK generator[4]+1Reported
Financing: Total raised is $25,000,000.

Source ledger

[1]Stainless Alternatives & Integrations | LLM Gateways | AI market mapIndependent analysis · keywordsai.co · May 18 2026
[2]Stainless Software gets $25M in funding to bring AI-generated SDKs to developers - SiliconANGLEIndependent report · siliconangle.com · May 18 2026
[3]Stainless Software Raises $25M in Series A FundingIndependent report · finsmes.com · May 18 2026
[4]Anthropic has acquired the dev tools startup used by OpenAI, Google, and CloudflareIndependent report · techcrunch.com · May 18 2026
[5]Stainless Software Raises $25 Million In Series A To Simplify API Development