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 supported by key partners like OpenRouter, Hugging Face, and Vercel. The author analyzes its potential impact, compares it to older APIs, and highlights the need for comprehensive client-side conformance testing.

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#api #json #llm
Open Responses

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