Anthropic is in advanced talks to buy Stainless for $300M. Stainless makes the SDKs that OpenAI and Google ship to developers. Last valuation was $150M in December 2024. Anthropic is paying roughly 2x in eleven months for a 4-year-old company whose product is one thing: software that auto-generates client libraries in Python, TypeScript, Go, Java, Kotlin, Ruby, and more from a single API spec. Every API company hits the same wall. Ship SDKs in 6+ languages or developers won't adopt you. Each…