Skip to content
OpenKey

Mistral Medium 3.1

Mistral AIReleased Aug 13, 2025

Mistral Medium 3.1 is an updated version of Mistral Medium 3, which is a high-performance enterprise-grade language model designed to deliver frontier-level capabilities at significantly reduced operational cost. It balances...

Try in playground
Context window
131K tokens
Input
text, image, file
Output
text
Tokenizer
Mistral
Knowledge cutoff
Jun 30, 2025
Released
Aug 13, 2025

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
Input$0.400$0.012$0.412
Output$2.00$0.060$2.06
Cache read$0.040$0.0012$0.041

Benchmarks

Artificial Analysis

Intelligence index
14.7
Coding index
20.5
Agentic index
6.2

Design Arena

CategoryEloWin rateRank
3Dmodels115944.7%#58
ASCII artmodels104430.8%#47
Codemodels117045.1%#61
Data vizmodels119147.6%#52
Game devmodels113940.7%#69
SVGmodels105038.2%#63
UI componentsmodels115443.5%#61
Websitesmodels117646%#61

Head-to-head preference voting. How we filter and rank

Supported parameters

  • frequency_penalty
  • max_tokens
  • presence_penalty
  • response_format
  • seed
  • stop
  • structured_outputs
  • temperature
  • tool_choice
  • tools
  • top_p

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model mistralai/mistral-medium-3.1.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "mistralai/mistral-medium-3.1",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="mistralai/mistral-medium-3.1",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "mistralai/mistral-medium-3.1",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Mistral Medium 3.1 cost via API?
Through OpenKey, Mistral Medium 3.1 costs $0.412 per 1M input tokens and $2.06 per 1M output tokens. That is the provider price ($0.400 / $2.00) plus a flat 3% fee — nothing else.
What is Mistral Medium 3.1's context window?
Mistral Medium 3.1 accepts up to 131K tokens of context.
Is Mistral Medium 3.1 OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "mistralai/mistral-medium-3.1" using any OpenAI SDK — only the base URL and API key change.
What inputs does Mistral Medium 3.1 support?
Mistral Medium 3.1 accepts text, image, file input and produces text output. Its knowledge cutoff is Jun 30, 2025.

More from Mistral AI

All Mistral AI models →