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Mistral · Language model

Mistral Small 4

mistralai/mistral-small-2603
  • Language
Released Mar 16, 2026

Mistral Small 4 is the next major release in the Mistral Small family, unifying the capabilities of several flagship Mistral models into a single system. It combines strong reasoning from...

Specifications

Context window
262,144 tokens
Max output
209,715 tokens
Input
text, image
Output
text
Reasoning effort
high, none
Tokenizer
Mistral

Supported parameters

Accepted by the model and forwarded as-is by the gateway.

  • frequency_penalty
  • max_tokens
  • presence_penalty
  • reasoning
  • reasoning_effort
  • response_format
  • seed
  • stop
  • structured_outputs
  • temperature
  • tool_choice
  • tools
  • top_p

Use it

POST /api/v1/chat/completions · MCP chat · full reference

curl https://omnirail.org/api/v1/chat/completions \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"mistralai/mistral-small-2603","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'