Anthropic is reportedly in advanced talks to acquire Stainless, a startup that builds software development kits for AI companies, including Google and OpenAI. The deal could value Stainless at over US$300 million. By acquiring such infrastructure, Anthropic could gain greater influence over how developers access and deploy AI systems across the industry.
Stainless is known for building tools that simplify and accelerate developer access to AI models, helping companies integrate advanced artificial intelligence systems more efficiently into their applications and services. The potential acquisition highlights intensifying competition among leading AI firms to control key layers of infrastructure that power access to large language models.
Stainless already provides tooling to major AI firms including Anthropic, OpenAI, and Google, positioning the startup within a rapidly growing AI developer infrastructure market.
The company’s software can also be used by AI agents, an area witnessing increased demand amid the rise of agentic AI systems and open-source frameworks such as OpenClaw. The growing adoption of AI agents has elevated the strategic importance of tooling focused on interoperability, API accessibility, automation, and faster model deployment across both closed and open AI ecosystems.
Meanwhile, Anthropic is targeting a $900 billion valuation in a new funding round, more than double its reported $380 billion valuation from February.
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