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The llm openai endpoint command was created out of frustration with the lack of an obvious CLI tool for testing prompts against arbitrary OpenAI Chat Completions imitation endpoints

The author built the feature because no simple CLI tool existed for trying prompts against arbitrary OpenAI-compatible endpoints. ✦ AI generated

Release author · Simon Willison's Weblog · 2026-07-30 · original ↗

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The llm openai endpoint command is really cool. I got frustrated at the lack of an obvious CLI tool for trying out prompts against arbitrary OpenAI Chat Completions imitation endpoints, so I decided to add that to LLM itself.

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✳ LLM

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provides context → A new llm openai endpoint command lets users run prompts, chats, and model listings against arbitrary OpenAI-compatible endpoints without configuring a model first, and these calls are not loggedRelease author · Simon Willison's Weblog