Mistral AI: Mistral Medium 3.1
mistralai/mistral-medium-3.1
Access Mistral Medium 3.1 from Mistral AI using Puter.js AI API.
Get Started// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms", {
model: "mistralai/mistral-medium-3.1"
}).then(response => {
document.body.innerHTML = response.message.content;
});
<html>
<body>
<script src="https://js.puter.com/v2/"></script>
<script>
puter.ai.chat("Explain quantum computing in simple terms", {
model: "mistralai/mistral-medium-3.1"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
# pip install openai
from openai import OpenAI
client = OpenAI(
base_url="https://api.puter.com/puterai/openai/v1/",
api_key="YOUR_PUTER_AUTH_TOKEN",
)
response = client.chat.completions.create(
model="mistralai/mistral-medium-3.1",
messages=[
{"role": "user", "content": "Explain quantum computing in simple terms"}
],
)
print(response.choices[0].message.content)
curl https://api.puter.com/puterai/openai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_PUTER_AUTH_TOKEN" \
-d '{
"model": "mistralai/mistral-medium-3.1",
"messages": [
{"role": "user", "content": "Explain quantum computing in simple terms"}
]
}'
Model Card
Mistral Medium 3.1 (August 2025) is a frontier-class multimodal model with improved tone and performance. It features 128K context, native vision, and enhanced reasoning for STEM and enterprise workflows at competitive pricing.
Context Window 131K
tokens
Max Output N/A
tokens
Input Cost $0.4
per million tokens
Output Cost $2
per million tokens
Release Date Aug 13, 2025
Model Playground
Try Mistral Medium 3.1 instantly in your browser.
This playground uses the Puter.js AI API — no API keys or setup required.
Benchmarks
How Mistral Medium 3.1 performs on standard evaluations.
| Benchmark | Score |
|---|---|
| GPQA Diamond Graduate-level science Q&A | 58.8% |
| Humanity's Last Exam Cross-domain reasoning | 4.7% |
| LiveCodeBench Recent coding problems | 40.6% |
| SciCode Scientific programming | 33.8% |
| AIME 2025 Advanced math exam | 38.3% |
| IFBench Instruction following | 39.8% |
| LCR Long-context reasoning | 21.3% |
| Terminal-Bench Hard Agentic terminal tasks | 10.6% |
| τ²-Bench Tool use / agents | 40.6% |
Scores sourced from Artificial Analysis.
Find other Mistral AI models →
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Mistral Medium 3.5 is a dense 128-billion-parameter multimodal model from Mistral AI that unifies instruction-following, reasoning, and coding into a single set of weights. It features a 256k-token context window, native function calling, structured JSON output, and vision capabilities via a custom-trained encoder that handles variable image sizes. A per-request reasoning_effort parameter lets you toggle between fast responses and deeper chain-of-thought processing, making the same model suitable for quick chat replies and complex agentic workflows. On benchmarks, it scores 77.6% on SWE-Bench Verified and 91.4% on τ³-Telecom. It replaces Mistral's previous Medium 3.1, Magistral, and Devstral 2 models. Priced at $1.50 per million input tokens and $7.50 per million output tokens, it's a strong fit for developers building tool-calling agents, long-horizon coding tasks, and multi-step automation pipelines.
ChatMistral Small 4
Mistral Small 4 is a 119B-parameter open-source Mixture-of-Experts model (6B active per token) released under Apache 2.0, unifying instruction-following, reasoning, multimodal (text + image), and agentic coding into a single deployment. It features 128 experts, a 256k context window, and configurable reasoning effort that lets developers toggle between fast responses and deep step-by-step reasoning per request. Compared to its predecessor Mistral Small 3, it delivers 40% lower latency and 3x higher throughput while matching or surpassing GPT-OSS 120B on key benchmarks.
ChatMinistral 14B
Ministral 14B is part of the Ministral 3 family, a 14B parameter multimodal model with vision capabilities under Apache 2.0. It offers advanced capabilities for local deployment with instruct, base, and reasoning variants achieving 85% on AIME'25.
Frequently Asked Questions
You can access Mistral Medium 3.1 by Mistral AI through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.
Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add Mistral Medium 3.1 to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.
| Price per 1M tokens | |
|---|---|
| Input | $0.4 |
| Output | $2 |
Mistral Medium 3.1 was created by Mistral AI and released on Aug 13, 2025.
Mistral Medium 3.1 supports a context window of 131K tokens. For reference, that is roughly equivalent to 262 pages of text.
Mistral Medium 3.1 scores 14.7 on the Artificial Analysis Intelligence Index, outperforming 48% of tracked models. On coding, it scores 20.5 (outperforms 26% of models). On math, it scores 38.3 (outperforms 39% of models).
Yes — the Mistral Medium 3.1 API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.
Get started with Puter.js
Add Mistral Medium 3.1 to your app without worrying about API keys or setup.
Read the Docs View Tutorials