Does Mistral-Medium-3.5-128B support zero data retention?

Yes. Mistral-Medium-3.5-128B is available with zero data retention by default on evroc through the Opper gateway.

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.

Open in playground Try in chat Compare

Key info

Input

Output

Features

Context window

—

Max output

—

Input price

$1.74 /1M

Output price

$6.96 /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 1 route through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.

Provider	Region	Zero data retention	Training	Input	Output
evroc	EU	Zero data retention	No	$1.74	$6.96

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 is on by default on Pay-as-you-go — no action required. No training on customer data. EU; DPA available.

Zero data retention: On by default on Pay-as-you-go. Derived from the logging and moderation facts.
Training: No training on customer data.
Logging: None
Moderation: No hold on content
Caching: Not established
Subprocessor access: Not established
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. Let your coding agent set it up, or call it directly — Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.

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: "evroc/mistralai/Mistral-Medium-3.5-128B",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);