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Standard Completions
A project to standardize a superset of the OpenAI-compatible completion APIs.
While OpenAI has committed to supporting the current Chat Completions API indefinitely, it does not support features like multimodal outputs, stored input objects, explicit caching, assistant prefixes (prefill), and other features. Providers offering OpenAI-compatible APIs have added these features in non-standard ways, complicating usage for developers.Many LLM providers and open-source projects now offer OpenAI-compatible Completions and Chat Completions APIs, including Deepseek, xAI, OpenRouter, Nous Research, vLLM, and more. If you are a provider or developer interested in joining the Standard Completions working group, please get in touch via email, Twitter/X, or open an issue on the rfcs repository:
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