Simon Willison 1/16/2026

Open Responses

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The article discusses Open Responses, a new standardization effort to create a vendor-neutral JSON API specification for clients interacting with hosted Large Language Models (LLMs). It is derived from OpenAI's Responses API and is supported by key partners like OpenRouter, Hugging Face, and Vercel. The author analyzes its potential impact, the rationale for choosing the Responses API, and notes the need for more comprehensive client-side conformance testing tools.

Open Responses

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