Mistral

Access 42 Mistral models through Mastra's model router. Authentication is handled automatically using the MISTRAL_API_KEY environment variable.

Learn more in the Mistral documentation.

.env

MISTRAL_API_KEY=your-api-key

src/mastra/agents/my-agent.ts

import { Agent } from "@mastra/core/agent";

const agent = new Agent({
  id: "my-agent",
  name: "My Agent",
  instructions: "You are a helpful assistant",
  model: "mistral/codestral-2508"
});

// Generate a response
const response = await agent.generate("Hello!");

// Stream a response
const stream = await agent.stream("Tell me a story");
for await (const chunk of stream) {
  console.log(chunk);
}

Models

20 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
mistral/codestral-2508	256K						$0.30	$0.90
mistral/codestral-latest	256K						$0.30	$0.90
mistral/ministral-14b-2512	262K						$0.20	$0.20
mistral/ministral-3b-2512	131K						$0.10	$0.10
mistral/ministral-3b-latest	131K						$0.04	$0.04
mistral/ministral-8b-2512	262K						$0.15	$0.15
mistral/ministral-8b-latest	262K						$0.10	$0.10
mistral/mistral-embed	8K						$0.10	—
mistral/mistral-large-2512	262K						$0.50	$2
mistral/mistral-large-4	1.0M						$0.68	$2
mistral/mistral-large-latest	262K						$0.50	$2
mistral/mistral-medium-2604	262K						$2	$8
mistral/mistral-medium-latest	262K						$2	$8
mistral/mistral-small-2603	262K						$0.15	$0.60
mistral/mistral-small-latest	262K						$0.15	$0.60
mistral/voxtral-mini-latest	—						—	—
mistral/voxtral-mini-tts-latest	—						—	—
mistral/voxtral-small-2507	33K						$0.10	$0.40
mistral/voxtral-small-latest	33K						$0.10	$0.30
mistral/zai-glm-5-3	1.0M						$1	$4

Model availability, capabilities, context windows, and pricing are sourced from models.dev and may change.

Advanced configuration

Custom headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.mistral.ai/v1",
    id: "mistral/codestral-2508",
    apiKey: process.env.MISTRAL_API_KEY,
    headers: {
      "X-Custom-Header": "value"
    }
  }
});

Dynamic model selection

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "dynamic-agent",
  name: "Dynamic Agent",
  model: ({ requestContext }) => {
    const useAdvanced = requestContext.task === "complex";
    return useAdvanced
      ? "mistral/zai-glm-5-3"
      : "mistral/codestral-2508";
  }
});