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Mistral

Mistral Medium 3.5

Mistral Medium 3.5 is a Mistral model with 262K context, $1.50 in / $7.50 out per million tokens, last verified September 26, 2026. Open weights: yes. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.

Mistral Medium 3.5 is the model Mistral calls its new flagship — a 128B dense open-weight model with a 256K context, powering its Vibe remote agents.

Catalog record checked September 26, 2026Individual provider fields may change

AI model specification details
SpecificationMistral Medium 3.5
ProviderMistral
TierFrontier
Context window262K
Max outputNot verifiedUnverified
Input / 1M tokens$1.50
Output / 1M tokens$7.50
WeightsOpen
Parameters128B dense
Reasoning levelsNot verifiedUnverified
Modalitiestext, image
LicenseModified MIT
API model idmistral-medium-3-5
ReleasedApril 28, 2026

Pricing tiers: Mistral first-party API $1.50/$7.50 per MTok; Mistral advertises up to 90% off cached input (exact cached rate not verified). Open weights under a Modified MIT licence. 128B dense.

Verified evidence

Published benchmark results

Each result keeps its source and measurement date visible. A missing benchmark is not treated as a zero.

Published benchmark results for Mistral Medium 3.5
BenchmarkScoreMeasuredSource
Artificial Analysis Intelligence Index14.22026-09-26Artificial Analysis · View source

Best for

  • EU-hosted frontier work
  • Open-weight self-hosting
  • Mistral Vibe agents

Watch out

Far behind US and Chinese frontier models on the Artificial Analysis index; max output is not published. Check the Modified MIT terms before redistribution.

History

Mistral Medium 3.5 timeline

Release and status events for this model that passed two-source verification — dated, sourced, and linked.

  • Mistral Medium 3.5ReleaseApril 28, 2026

    Mistral releases Medium 3.5 — a 128B dense open-weight model (Modified MIT) it calls its new flagship — at $1.50/$7.50 per MTok with a 256K context.

    Mistral docs changelog

Source receipts

Catalog figures for this model were checked against the following sources.

Common questions

Mistral Medium 3.5

Answered from the verified figures on this page rather than general guidance.

How much does Mistral Medium 3.5 cost per million tokens?
Mistral Medium 3.5 is listed at $1.50 per million input tokens and $7.50 per million output tokens at standard rates. Output tokens usually dominate real bills, so weigh the output rate more heavily than the input rate. Mistral first-party API $1.50/$7.50 per MTok; Mistral advertises up to 90% off cached input (exact cached rate not verified). Open weights under a Modified MIT licence. 128B dense.
What is Mistral Medium 3.5's context window?
Mistral Medium 3.5 accepts about 262K tokens of context. That only matters if you routinely send very long documents, large codebases, or multi-turn histories that approach that limit.
What is Mistral Medium 3.5 best for?
Mistral Medium 3.5 is a frontier tier from Mistral. It suits eu-hosted frontier work, open-weight self-hosting, mistral vibe agents. Far behind US and Chinese frontier models on the Artificial Analysis index; max output is not published. Check the Modified MIT terms before redistribution.
Can I self-host Mistral Medium 3.5?
Mistral Medium 3.5 publishes open weights, but self-hosting depends on the licence, hardware footprint, quantisation quality, and serving stack. A hosted API is often cheaper until you have measured throughput and concurrency on your own hardware.
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