Mistral-Small-3.1 — Free API

What is Mistral-Small-3.1?

Mistral Small 3.1 is Mistral AI's efficient 24B-parameter model, available free on GitHub Models. It delivers strong multilingual performance and instruction-following at a fraction of the cost of larger models, making it a practical choice for chat applications, content generation, and text analysis. With 128K context, OpenAI SDK compatibility, and 15 RPM / 150 RPD limits, it is well-suited for prototyping and personal projects. The main limitation on GitHub Models is the 4K per-request output cap — adequate for chat turns and short-form generation, but constraining for long-form writing tasks.

Mistral-Small-3.1 API Code Example

Paste your API key and run. See the config generator for Claude Code, Cursor, and more tools.

from openai import OpenAI

client = OpenAI(
    base_url="https://models.github.ai/inference",
    api_key="YOUR_API_KEY"
)

response = client.chat.completions.create(
    model="mistral-small-3-1",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const openai = new OpenAI({
  baseURL: "https://models.github.ai/inference",
  apiKey: "YOUR_API_KEY",
});

const completion = await openai.chat.completions.create({
  model: "mistral-small-3-1",
  messages: [{ role: "user", content: "Hello!" }],
});

console.log(completion.choices[0].message.content);

curl https://models.github.ai/inference/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "mistral-small-3-1",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

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