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Mistral Medium 3.5

Mistral AI's dense 128B open-weights model under a modified MIT license; it replaces Devstral 2 in Mistral's Vibe CLI.

  • Mistral AI
  • Open weights
  • Released Apr 2026

Official page

Where it ranks

  • A
    Chat & assistants
    Models · Local · 1,426 on LMArena Text Arena (overall, style control)
  • B
    Writing
    Models · Local · 1,400 on LMArena Text Arena: Creative Writing (style control)
  • C
    Coding
    Models · Local · 1,264 on LMArena WebDev / Code Arena (overall)
  • B
    Image understanding
    Models · Local · 1,200 on LMArena Vision Arena (overall, style control)
  • C
    Vector graphics & logos
    Models · Local · 948 on Design Arena SVG

Facts

Vendor
Mistral AI
Family
Mistral Medium
Released
Apr 2026
Weights
Open: download and run it yourself
License
Modified MIT
Parameters
128B
GPU memory to run locally
~75 GB (4-bit ≈ 128 B × 0.57 GB + 1.5 GB ≈ 75 GB, estimate.)
API price
$1.5 in / $7.5 out per 1M tokens
Access
Free (open weights)
Last verified
18 Oct 2026

Price from openrouter.ai, 18 Oct 2026.

Benchmark results

BenchmarkResultEntry on the leaderboardAs ofSource
Artificial Analysis Intelligence Index14Mistral Medium 3.5
Raw value from the page's embedded model data; the site displays it rounded to an integer.
18 Oct 2026artificialanalysis.ai
Artificial Analysis MMMU-Pro (independent evaluation)64.9%Mistral Medium 3.5
Raw fraction 0.6486 from the model data embedded in https://artificialanalysis.ai/leaderboards/models, converted to percent; rank 77 of 124 entries with an MMMU-Pro result; no last-updated date shown.
19 Oct 2026artificialanalysis.ai
Design Arena SVG948Mistral Medium 3.5
Design Arena SVG, rank 125, 1157 battles; marked inactive; rows read from POST https://www.designarena.ai/api/leaderboard (arenaType 'models', category 'svg'); names from https://www.designarena.ai/api/registry
19 Oct 2026designarena.ai
LMArena Text Arena (overall, style control)1,426mistral-medium-3.5
From LMArena's official leaderboard-dataset (text_style_control, split latest, category overall, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text (site blocks automated fetches).
15 Oct 2026huggingface.co
LMArena Text Arena: Creative Writing (style control)1,400mistral-medium-3.5
From LMArena's official leaderboard-dataset (text_style_control, split latest, category creative_writing, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text/creative-writing (site blocks automated fetches). Rank 111 of 414; 2073 votes; 95% CI 1386.3-1413.8.
15 Oct 2026huggingface.co
LMArena Vision Arena (overall, style control)1,200mistral-medium-3.5
From LMArena's official leaderboard-dataset (vision_style_control, split latest, category overall, published 2026-10-09), which mirrors https://arena.ai/leaderboard/vision (site blocks automated fetches). Rank 91 of 165; 5375 votes; 95% CI 1190.8-1210.0.
9 Oct 2026huggingface.co
LMArena WebDev / Code Arena (overall)1,264Mistral Medium 3.5
From LMArena's official leaderboard-dataset (webdev = Code Arena, split latest, category overall, published 2026-10-18), which mirrors https://arena.ai/leaderboard/webdev. Rank 129; 2316 votes; 95% CI 1249.5-1279.1.
18 Oct 2026huggingface.co
SWE-bench Verified (vendor-reported)77.6%Mistral Medium 3.5
vendor-reported in model card, harness: not stated
18 Oct 2026huggingface.co

Where you can use it

Earlier versions

  • Mistral Medium 3.1 · —

Sources