The Model Index
Models/Mistral

Mistral Medium 3.5

MistralReleased 28 Apr 2026Open
CompareAnnouncement
134121–147Index score#106 · provisional, limited data
0/ 8Core tests taken0 of 6 areas · plus 6 anchor tests
−43Versus the frontier at releasebest then: GPT-5.5
$1.5/ $7.5Price per million tokensinput / output, list price
262KContext windowtokens it reads at once

Where it sitson the frontier

o1 reached this score 17 months earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeno evidence yet
GPQA Diamond
no result
Humanity's Last Exam
no result
Mathsevidence
FrontierMath T1-3
no result
Codingevidence
SWE-bench Verified
no result
Terminal-Bench
no result
Agentsevidence
APEX-Agents
no result
Novel problemsno evidence yet
ARC-AGI-2
no result
Long tasksno evidence yet
METR time horizon
no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

What others sayrank on each leaderboard

The Model Indexindependent tests, our method#106of 219 · 134
LMArena · Creative writingcreative writing#97of 386 · 1400LMArena · Codingcoding questions in chat#99of 383 · 1479LMArena · Textoverall chat quality, judged by people#101of 388 · 1427LMArena · Mathsmaths questions in chat#98of 373 · 1428Artificial Analysis Intelligence Indexoverall capability across ten evaluations#74of 207 · 14Epoch Capabilities Indexoverall capability from many benchmarks#99of 239 · 141.4LMArena · Visionunderstanding images#76of 149 · 1200LMArena · WebDevbuilding web apps and front ends#107of 123 · 1263

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

Not in the top three among current models on any category we track.

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 1 Oct 2026

From the lab

Le Chatapp · subscription↗Mistral APIAPI↗

API providers 1 · per million tokens, in / out

MMistral$1.65 / $8.25cheapest

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

Released28 Apr 2026
Announcementmistral.ai ↗
Release entryMistral Medium 3.5
Scored asMistral Medium 3.5
Artificial Analysis index14
Output speed165 tokens/s
Hugging Facenot linked

Mistral releasesaround this one

Devstral 2Open
Mistral Small 4Open
~129 est.
Mistral Medium 3.5Open
index 134