Does Mistral Medium 3.5 128B support zero data retention?

Yes. Mistral Medium 3.5 128B is available with zero data retention on evroc, GreenPT through the Opper gateway. Other routes carry zero data retention with abuse monitoring; see each route's window in the data-handling section.

Where is Mistral Medium 3.5 128B hosted?

Mistral Medium 3.5 128B runs on EU hosting routes through the Opper gateway, with contractually enforced residency on supported providers.

Is Mistral Medium 3.5 128B trained on prompts and outputs?

No. Every hosting route for Mistral Medium 3.5 128B is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for Mistral Medium 3.5 128B?

Yes. A GDPR Data Processing Agreement is available on at least one route serving Mistral Medium 3.5 128B. Contact hello@opper.ai to receive it.

Mistral Medium 3.5 128B

by Mistral

Mistral Medium 3.5 is a dense 128 billion parameter model released April 2026, handling instruction-following, reasoning, and coding in a single set of weights with a configurable reasoning effort. With a 256k token context window and an open-weight release under a modified MIT license, it balances frontier capability with self-hosting accessibility on as few as four GPUs. Built for agentic systems and software development, the model consolidates Mistral's prior reasoning, coding, and chat lines, supporting function calling, agent orchestration, structured outputs, and multimodal understanding. It scores 77.6% on SWE-Bench Verified, making it well suited to autonomous systems, reasoning-heavy applications, and complex coding tasks.

Call Mistral Medium 3.5 128B on Opper with the OpenAI SDK. Sign up without a credit card. Get started

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Key info

Input

Output

Features

Context window

—

Max output

—

Input price

$1.68 /1M

Output price

$6.72 /1M

EU residency available
Zero data retention on pay-as-you-go
No training by default
GDPR DPA available

Available routes

Mistral Medium 3.5 128B runs on 3 different routes through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below. In the EU it is served by evroc (Sweden), GreenPT and Scaleway (France). See every Mistral model hosted in the EU.

Provider	Region	Training	Input	Output	Cache read
evroc	EU	No	$1.68	$6.72	Input price
GreenPT	EU	No	$2.02	$10.09	Input price
Scaleway	EU	No	$1.68	$8.40	Input price

Live routes and prices as JSON: api.opper.ai/v3/models?q=mistral-medium-3.5-128b

Data handling per route

Each route hosting Mistral Medium 3.5 128B has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

evroc — Sweden🇸🇪

Zero data retention: nothing is logged, held for abuse monitoring or used for training. No training on customer data. EU; DPA available.

Zero data retention: Yes. Nothing is logged, held for abuse monitoring or used for training.
Training: No training on customer data.
Logging: None
Abuse monitoring: No classifier
Subprocessor access: No subprocessor reads content
GDPR DPA: DPA available
Transfer mechanism: Not applicable — data stays in EU

GreenPT — EU🇪🇺

Zero data retention: nothing is logged, held for abuse monitoring or used for training. No training on customer data. EU; DPA available.

Zero data retention: Yes. Nothing is logged, held for abuse monitoring or used for training.
Training: No training on customer data.
Logging: None
Abuse monitoring: Keeps nothing
Caching: Content cached for replay
Subprocessor access: Subprocessors may read content
GDPR DPA: DPA available
Transfer mechanism: Not applicable — data stays in EU

Scaleway — France🇫🇷

Zero data retention with abuse monitoring: prompts and outputs are kept for up to 14 days for abuse monitoring only, and are not used for training. No training on customer data. EU; DPA available.

Zero data retention: With abuse monitoring, 14-day window.
Training: No training on customer data.
Logging: Abuse monitoring (14-day retention)
Abuse monitoring: No classifier
Caching: Content cached for replay
Subprocessor access: No subprocessor reads content
GDPR DPA: DPA available
Transfer mechanism: Not applicable — data stays in EU

Get started

Call Mistral Medium 3.5 128B through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

Mistral Medium 3.5 128B is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.

Set it up with your agent

Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.

Or call it directly

1import OpenAI from "openai";
2
3const client = new OpenAI({
4  apiKey: process.env.OPPER_API_KEY,
5  baseURL: "https://api.opper.ai/v3/compat",
6});
7
8const completion = await client.chat.completions.create({
9  model: "mistral-medium-3.5-128b",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);