Mistral opens a Responses API in public preview and serves DeepSeek V4.1 Flash and GLM 5.3 Flash

Mistral announced on October 28 that its Responses API, made for building agents on Mistral, is in public preview. According to Mistral, each response returns the model's answer, its reasoning and its tool calls as separate items, so an app can handle every step more easily than with Chat Completions. It works with all chat models hosted by Mistral, including Large 4. The documentation is on Mistral's Studio docs site.

Mistral also says it now serves two fast, low-cost models on Mistral AI Cloud Inference, in the EU and the US:

• DeepSeek V4.1 Flash, in public preview, which Mistral recommends for long-context coding and agentic tasks.
• GLM 5.3 Flash, now generally available, which Mistral recommends for subagents, tool calls and coding tasks.