Mistral-Small-3.1 — Free AI Model & API

github-models/mistral-small-3-1

chat

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Context Window 128K

Max Output 4K

Rate Limit 15 RPM, 150 RPD

Cost $0.00 FREE

Free Period Since May 10, 2026

Credit Card Not required

Status Online

Overview

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.

Model ID

mistral-small-3-1

Base URL

https://models.inference.ai.azure.com

Specifications

Context: 128K · Output: 4K · Modality: text · OpenAI Compat: Yes

Quick Start

Integrate Mistral-Small-3.1 with 3 lines of code. See the config generator for Claude Code, Cursor, and more.

from openai import OpenAI

client = OpenAI(
 base_url="https://models.inference.ai.azure.com",
 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.inference.ai.azure.com",
 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.inference.ai.azure.com/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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Rate Limits & Constraints

Rate Limit 15 RPM, 150 RPD

Context Window 128K

Max Output Tokens 4K

Cost Free — since May 10, 2026

Credit Card Not required

OpenAI Compatible Yes — drop-in replacement

GitHub Models Platform Limitations

Low per-request token limits (8K input / 4K output)
Rate limits tied to GitHub Copilot subscription tier
Not suitable for large-context or long-generation tasks

Features & Use Cases

Best For

Chat

Modality Support

text

GitHub Models Highlights

45+ models including GPT-4.1 and o3
Free for all GitHub accounts
Includes Llama 4, DeepSeek-R1, Mistral
Base URL: models.inference.ai.azure.com

Playground — Test Mistral-Small-3.1

Test Mistral-Small-3.1 directly in your browser. Your API key is sent directly to GitHub Models — never stored.

Model: Mistral-Small-3.1 Get Key

🔒 Your key is never stored — sent directly to the model provider via our server proxy.

Ready to chat with Mistral-Small-3.1.

Frequently Asked Questions

How do I get an API key for Mistral-Small-3.1?

Sign up at GitHub Models to get your API key. No credit card is required — just an email sign-up. Once you have the key, use the code snippets in the Quick Start section above.

Is Mistral-Small-3.1 really free?

Yes. Mistral-Small-3.1 is available on GitHub Models's free tier and has been free since May 10, 2026. Rate limits apply: 15 RPM, 150 RPD. Always check the provider's terms for any changes to the free tier.

What are Mistral-Small-3.1's rate limits?

15 RPM, 150 RPD Context window: 128K. Max output: 4K. No credit card required.

What are the best free alternatives to Mistral-Small-3.1?

Popular free alternatives include inclusionAI: Ring-2.6-1T, Baidu Qianfan: CoBuddy (free), Owl Alpha. You can also browse all 147+ free models on our site.