Mistral Medium 3.5
Mistral AIReleased Apr 30, 2026
Mistral Medium 3.5 is a dense 128B instruction-following model from Mistral AI. It supports text and image inputs with text output, and is designed for agentic workflows, coding, and complex...
- Context window
- 262K tokens
- Input
- text, image, file
- Output
- text
- Tokenizer
- Mistral
- Released
- Apr 30, 2026
- Reasoning
- optional
Pricing
Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.
| Per 1M tokens | Provider | + 3% fee | You pay |
|---|---|---|---|
| Input | $1.50 | $0.045 | $1.54 |
| Output | $7.50 | $0.225 | $7.73 |
Benchmarks
Artificial Analysis
- Intelligence index
- 29.9
- Coding index
- 46.9
- Agentic index
- 19
Supported parameters
- frequency_penalty
- include_reasoning
- max_tokens
- presence_penalty
- reasoning
- 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-3-5.
curl https://api.openkey.ai/v1/chat/completions \
-H "Authorization: Bearer $OPENKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "mistralai/mistral-medium-3-5",
"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-3-5",
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-3-5",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Questions
- How much does Mistral Medium 3.5 cost via API?
- Through OpenKey, Mistral Medium 3.5 costs $1.54 per 1M input tokens and $7.73 per 1M output tokens. That is the provider price ($1.50 / $7.50) plus a flat 3% fee — nothing else.
- What is Mistral Medium 3.5's context window?
- Mistral Medium 3.5 accepts up to 262K tokens of context.
- Is Mistral Medium 3.5 OpenAI-compatible?
- Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "mistralai/mistral-medium-3-5" using any OpenAI SDK — only the base URL and API key change.
- What inputs does Mistral Medium 3.5 support?
- Mistral Medium 3.5 accepts text, image, file input and produces text output.
More from Mistral AI
All Mistral AI models →Mistral Small 4
Mistral Small 4 is the next major release in the Mistral Small family, unifying the capabilities of several flagship Mistral models into a single system. It combines strong reasoning from...
ctx 262Kin $0.154out $0.618
Devstral 2 2512
Devstral 2 is a state-of-the-art open-source model by Mistral AI specializing in agentic coding. It is a 123B-parameter dense transformer model supporting a 256K context window. Devstral 2 supports exploring...
ctx 262Kin $0.412out $2.06
Ministral 3 14B 2512
The largest model in the Ministral 3 family, Ministral 3 14B offers frontier capabilities and performance comparable to its larger Mistral Small 3.2 24B counterpart. A powerful and efficient language...
ctx 262Kin $0.206out $0.206
Ministral 3 3B 2512
The smallest model in the Ministral 3 family, Ministral 3 3B is a powerful, efficient tiny language model with vision capabilities.
ctx 131Kin $0.103out $0.103