Mistral API
API access to Mistral's model lineup including Mistral Large for frontier capability and Mistral Small 4 — a 2026 unification of the Magistral, Pixtral, and Devstral lines into a single multimodal model. Strong open-weight strategy alongside the managed API.
OpenAI API
API access to GPT-5, GPT-5.5, o3/o4 reasoning models, and the Responses API; plus embeddings, image, audio, and Realtime endpoints. The most widely deployed LLM API in production.