Ask HN: What are Stainless users doing now that Anthropic has killed it?

[ubutler]

Hey HN, Two days ago, Anthropic bought Stainless and then immediately killed it. Stainless offered the ability to take an OpenAPI spec and automatically turn it into SDKs in almost any language, plus an MCP server.

My company makes legal AI models that we serve through an API. All our SDKs we're generated by Stainless. Those SDKs are in active use in production and, come September, will need to be maintained by someone other than Stainless.

We're not the only ones in this boat. OpenAI and Google also relied on Stainless.

What are other users planning on doing now that Stainless is gone?

We're hoping that a competitor or open-source community ends up taking on the mission of ensuring backwards compatibility or, at the very least, as seamless a migration as possible. If that doesn't get pulled off soon though, we may be forced into either completely breaking existing code or else maintaining everything by hand — the very thing Stainless was meant to take off our plate.

Has anyone else thought of better options yet?

[ThomasRooney]

1. Migrate to Speakeasy

Whilst both Stainless and Speakeasy ended up with a very different configuration paradigm, they can generate very similar code once the configuration is migrated from Stainless-form (stainless.yml) to Speakeasy-form (OpenAPI Overlays). This process is not entirely deterministic, but a good few prompts into a coding agent can do the vast bulk of the work.

We've already been working with a few companies to:

    1. Do a seamless migration where we apply a few custom code patches to tighten the delta between the generated code to the point that this becomes as close to a backwards compatible a change as feasible.
    2. Re-build workflow configuration from the Stainless paradigm (cloud based) to the Speakeasy paradigm (CLI/GitHub Action based) so this is extremely hands-off.

Source: I work at Speakeasy.

2. There are a lot of OSS SDK generators -- this one is probably the biggest aggregator https://openapi.tools/categories/sdk-generators

[mmarian]

I'd check what Cloudflare's doing, they're in the same boat.

[mockbolt]

openapi-typescript + hey-api/openapi-ts for basic typed clients. Speakeasy is the closest paid replacement people I know are moving to.