Mistral

The official external mistral plugin registers four contracts: chat completions, media understanding (Voxtral batch transcription), realtime STT for Voice Call (Voxtral Realtime), and memory embeddings (mistral-embed).

Property	Value
Provider id	`mistral`
Plugin	`@openclaw/mistral-provider`
Auth env var	`MISTRAL_API_KEY`
Onboarding flag	`--auth-choice mistral-api-key`
Direct CLI flag	`--mistral-api-key <key>`
API	OpenAI-compatible (`openai-completions`)
Base URL	`https://api.mistral.ai/v1`
Default model	`mistral/mistral-large-latest`
Embedding model	`mistral-embed`
Voxtral batch	`voxtral-mini-latest` (audio transcription)
Voxtral realtime	`voxtral-mini-transcribe-realtime-2602`

Getting started

Install the plugin

openclaw plugins install @openclaw/mistral-provider
openclaw gateway restart

Get your API key

Create an API key in the Mistral Console.

Run onboarding

openclaw onboard --auth-choice mistral-api-key

Or pass the key directly:

openclaw onboard --mistral-api-key "$MISTRAL_API_KEY"

Set a default model

{
  env: { MISTRAL_API_KEY: "sk-..." },
  agents: { defaults: { model: { primary: "mistral/mistral-large-latest" } } },
}

Verify the model is available

openclaw models list --provider mistral

Built-in LLM catalog

Model ref	Input	Context	Max output	Notes
`mistral/mistral-large-latest`	text, image	262,144	16,384	Default model
`mistral/mistral-medium-3-5`	text, image	262,144	8,192	Mistral Medium 3.5; adjustable reasoning
`mistral/mistral-small-latest`	text, image	262,144	16,384	Mistral Small 4 latest; adjustable `reasoning_effort`
`mistral/mistral-small-2603`	text, image	262,144	16,384	Mistral Small 4 pinned; adjustable `reasoning_effort`
`mistral/codestral-latest`	text	128,000	4,096	Coding
`mistral/mistral-medium-2508`	text, image	128,000	8,192	Deprecated; hidden; use Mistral Medium 3.5
`mistral/devstral-medium-latest`	text	262,144	32,768	Deprecated; hidden; use Mistral Medium 3.5

Browse the plugin catalog row before changing config:

openclaw models list --all --provider mistral --plain

Smoke-test a model without starting the Gateway:

openclaw infer model run --local \
  --model mistral/mistral-medium-3-5 \
  --prompt "Reply with exactly: mistral-ok" \
  --json

Audio transcription (Voxtral)

Use Voxtral for batch audio transcription through the media understanding pipeline:

{
  tools: {
    media: {
      audio: {
        enabled: true,
        models: [{ provider: "mistral", model: "voxtral-mini-latest" }],
      },
    },
  },
}

The media transcription path uses /v1/audio/transcriptions. The default audio model for Mistral is voxtral-mini-latest.

Voice Call streaming STT

The mistral plugin registers Voxtral Realtime as a Voice Call streaming STT provider.

Setting	Config path	Default
API key	`plugins.entries.voice-call.config.streaming.providers.mistral.apiKey`	Falls back to `MISTRAL_API_KEY`
Model	`...mistral.model`	`voxtral-mini-transcribe-realtime-2602`
Encoding	`...mistral.encoding`	`pcm_mulaw`
Sample rate	`...mistral.sampleRate`	`8000`
Target delay	`...mistral.targetStreamingDelayMs`	`800`

{
  plugins: {
    entries: {
      "voice-call": {
        config: {
          streaming: {
            enabled: true,
            provider: "mistral",
            providers: {
              mistral: {
                apiKey: "${MISTRAL_API_KEY}",
                targetStreamingDelayMs: 800,
              },
            },
          },
        },
      },
    },
  },
}

OpenClaw defaults Mistral realtime STT to pcm_mulaw at 8 kHz so Voice Call can forward Twilio media frames directly. Use encoding: "pcm_s16le" and a matching sampleRate only if your upstream stream is already raw PCM.

Advanced configuration

Adjustable reasoning

mistral/mistral-small-latest, mistral/mistral-small-2603, and mistral/mistral-medium-3-5 support adjustable reasoning on the Chat Completions API via reasoning_effort (none minimizes extra thinking in the output; high surfaces full thinking traces before the final answer).OpenClaw maps the session thinking level to Mistral’s API:

OpenClaw thinking level	Mistral `reasoning_effort`
off / minimal	`none`
low / medium / high / xhigh / adaptive / max	`high`

Avoid combining Medium 3.5 reasoning mode with temperature: 0; the Mistral HTTP API has been reported to reject reasoning_effort="high" plus temperature: 0 with a 400 response. Leave temperature unset, or turn thinking off/minimal so OpenClaw sends reasoning_effort: "none" before you set a low temperature.

Example model-scoped config for Medium 3.5 reasoning:

{
  agents: {
    defaults: {
      model: { primary: "mistral/mistral-medium-3-5" },
      models: {
        "mistral/mistral-medium-3-5": {
          params: { thinking: "high" },
        },
      },
    },
  },
}

Other Mistral catalog models do not use this parameter. Mistral’s native Magistral models are deprecated; use adjustable reasoning on Mistral Small 4 or Mistral Medium 3.5 for current API models.

Memory embeddings

Mistral can serve memory embeddings via /v1/embeddings (default model: mistral-embed):

{
  memory: {
    search: { provider: "mistral" },
  },
}

Auth and base URL

Mistral auth uses MISTRAL_API_KEY (Bearer header).
Provider base URL defaults to https://api.mistral.ai/v1 and accepts the standard OpenAI-compatible chat-completions request shape.
Onboarding default model is mistral/mistral-large-latest.
Override the base URL under models.providers.mistral.baseUrl only when Mistral explicitly publishes a regional endpoint you need.

Model selection

Choosing providers, model refs, and failover behavior.

Media understanding

Audio transcription setup and provider selection.

Overview

Concepts and configuration

Providers

Getting started

Built-in LLM catalog

Audio transcription (Voxtral)

Voice Call streaming STT

Advanced configuration

Model selection

Media understanding

​Getting started

​Built-in LLM catalog

​Audio transcription (Voxtral)

​Voice Call streaming STT

​Advanced configuration

​Related

Model selection

Media understanding

Getting started

Built-in LLM catalog

Audio transcription (Voxtral)

Voice Call streaming STT

Advanced configuration

Related