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Where 25 OpenAI-Compatible APIs Disagree with OpenAI

This story is from 2026-09-09. It is preserved in the archive; the latest stories are on the live feed.

TL;DR Dozens of LLM providers advertise OpenAI-compatible APIs, but strict client SDKs frequently fail due to payload mismatches. Primary discrepancies center on streaming tool-call deltas, omitted chunk indices, conflicting finish_reason values, and non-standard usage accounting. Reasoning models…

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  1. 2026-09-09 14:44 · DEV Community — AI
    Where 25 OpenAI-Compatible APIs Disagree with OpenAI

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