The Model Index
Models/Mistral

Mistral Medium 3.1

MistralReleased 12 Aug 2025Closed weights
121103–139Index score#141 of 199 models
0/ 9Core tests taken0 of 6 areas · plus 12 anchor tests
−32Versus the frontier at releasebest then: GPT-5Replaced by Mistral Medium 3.5
$0.40/ $2.0Price per million tokensinput / output, list price
131KContext windowtokens it reads at once

Where it sitson the frontier

801001201401601802002023202420252026GPT-4 at launch = 100Mistral Medium 3.1

o1-mini reached this score 11 months earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeevidence
GPQA Diamond (Epoch AI)
no result
Humanity's Last Exam
no result
Mathsevidence
FrontierMath (tiers 1-3)
no result
Codingevidence
SWE-bench Verified
no result
Terminal-Bench 4.0
no result
Agentsevidence
APEX-Agents
no result
Professional workevidence
Finance Agent (v2)
no result
Novel problemsno evidence yet
ARC-AGI-2
no result
Long tasksno evidence yet
METR time horizon
no result

Independent results from Epoch AI, Vals AI, LiveBench, ARC Prize, Scale AI and other testers, at the model’s best standard setting. The core tests are shown here; anchor tests also inform the score and can be shown above. Hover a bar for who ran it.

What others sayrank on each leaderboard

The Model Indexindependent tests, our method#141of 246 · 121

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

Best attop three among current models

Replaced by Mistral Medium 3.5; it no longer leads any category among current models.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

Where to use itprices checked 5 Oct 2026

API providers 1 · per 1M tokens, in / out

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

Facts and sources

Released12 Aug 2025
Announcementnot linked yet
Release entry–
Scored asMistral Medium 3.1
Output speed–
Hugging Faceclosed weights

Mistral releasesaround this one