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Same prompt, three models: who actually follows a strict format?

I run a lot of structured-output work and keep testing the same strict JSON prompt across Claude, ChatGPT and Gemini. Rough pattern I keep seeing: Claude holds format best over long multi-turn runs, ChatGPT is strong on turn one but drifts, Gemini is fast but needs the schema repeated near the end…

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  1. 2026-10-28 05:00 · r/PromptEngineering
    Same prompt, three models: who actually follows a strict format?

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