Mistral Small 4

Mistral AI · Text Generation

POST /v1/chat/completions

Hybrid model unifying Instruct, Reasoning (Magistral), and Devstral families: 40% lower completion time and 3x throughput vs Small 3.

At a glance

Pricing

Example request

$
curl https://api.empiriolabs.ai/v1/chat/completions \
>
  -H 'Authorization: Bearer $EMPIRIOLABS_API_KEY' \
>
  -H 'Content-Type: application/json' \
>
  -d '{"model": "mistral-small-4", "messages": [{"role":"user","content":"Hello"}]}'

Parameters

Notes

Tools (web search, code interpreter, image generation) are billed only when actually invoked.

Per-tool billing (usage.tool_usage)

When this model invokes built-in tools (web search, code interpreter, etc.) inside a single request, the response carries a normalized usage.tool_usage map alongside the token counts. The example below shows the shape — exact field names, units, and which tools appear can vary slightly per provider:

1
"usage": {
2
  "prompt_tokens": 123,
3
  "completion_tokens": 456,
4
  "cost_usd": 0.0042,
5
  "tool_usage": {"web_search": 3, "code_interpreter": 1}
6
}

The tool counts are already factored into cost_usd — they are surfaced for transparency so you can audit per-tool billing. The field is omitted when no tools were invoked.

Machine-readable schema: GET https://api.empiriolabs.ai/v1/models/mistral-small-4.