Project AURIONAI Use-Cases Research & Innovation
Mistral AI
multimodal LLM

Mistral Medium 3.5 (v26.04)

Mistral model optimised for agentic and coding use; absorbs the Devstral role.

Mistral AIMistral AIFrance
Bar chart of agentic benchmark scores for Mistral Medium 3.5 against earlier Mistral models, from the model card.
Levelmodel
Classmultimodal LLM
Parameters128B
Context256,000
Released28 Apr 2026
Opennessopen weights restricted
Runs onmulti-GPU node, single datacentre GPU
Statusactive

Benchmark Results

vendor-reportedmaintainer-runindependent
Arena Text leaderboardhuman preference arena
independent
no score in the notes
rank 117, Arena Text overall8 Oct 2026 arena.ai
Artificial Analysis Intelligence Index v4.3.2composite index
independent
14
03060

Score in index. Higher is better.

AA leaderboard, 205 current models10 Oct 2026 artificialanalysis.ai
SEA-HELMSoutheast Asian and Indonesian
maintainer-run
70.09 95% CI [-1.18, +1.13]
04080

Score in score. Higher is better.

rank 9, SEA-HELM Indonesian, open-weight models, average of 2,000 bootstraps18 Sep 2026 leaderboard.sea-lion.ai
maintainer-run
64.71 95% CI [-0.59, +0.59]
04080

Score in score. Higher is better.

SEA-HELM SEA average, open-weight models18 Sep 2026 leaderboard.sea-lion.ai
SWE-bench Verifiedcoding
vendor-reported
77.6
050100

Score in %. Higher is better.

huggingface.co
Where this comes from
Every score names who ran it: vendor-reported, maintainer-run or independent. A rank is shown with the population it was ranked in (gap rule 3).

R&D Topics

Agents and tool useproduced byFrontier pretraining scalingproduced by

Identity

Developer
Mistral AI
Family
not in the notes
Released
28 Apr 2026 sourcesnotes
Weights published
–
Record checked
10 Oct 2026
Where this comes from
Developer and dates from the research notes. Release date is the vendor's public announcement; weights date is when open weights were published.

Architecture and Size

Architecture
dense transformer Dense, merged instruct + reasoning + code, own vision encoder
Total parameters
128B sources
Active parameters
–
Checkpoint parameters
–
Context length
256,000 tokens
Input
text, image
Output
text
Where this comes from
Parameter counts as the developer states them. Where the checkpoint holds a different total, both are shown (register A16).

Openness and Access

Openness
open weights restricted
Licence
Modified MIT (Mistral AI) sources
Access routes
open weights download
Where this comes from
The licence file governs over registry tags and aggregator labels.

Deployment

Runs on
multi-GPU node, single datacentre GPU
Footprint
T3 estimate (unverified).
Runtimes
not in the notes
Where this comes from
Deployment tiers and runtimes as named in the notes. Footprint is the notes' figure, not a measurement by AURION.

Indonesia

Indonesian support
measured on a benchmark
  • SEA-HELM Indonesian leaderboard (ID aggregate, first score column of the Indonesian Competency and Task Scores table): 70.09 (95% CI -1.18 to +1.13), run by AI Singapore (SEA-HELM leaderboard maintainer) leaderboard.sea-lion.ai
Regional languages
not in the notes
Jakarta hosting
unknown
Languages
not in the notes
Where this comes from
Indonesia fields are carried on every model; unknown is an allowed value.

Lineage

The notes record no lineage for this model.

Industry Use Cases

No industry use case links this model.

Sources

  1. Models Overview docs.mistral.ai https://docs.mistral.ai/getting-started/models/models_overview/
  2. LLM Leaderboard - Comparison of AI models from OpenAI, Anthropic, Google, SpaceXAI & others | Artificial Analysis artificialanalysis.ai https://artificialanalysis.ai/leaderboards/models
  3. Text Arena: LLM Rankings & AI Model Benchmarks arena.ai https://arena.ai/leaderboard/chat/text
  4. huggingface.co/mistralai/Mistral-Medium-3.5-128B https://huggingface.co/mistralai/Mistral-Medium-3.5-128B
  5. Open-Source LLMs 2026: Which Are Actually Open-Licensed codersera.com https://codersera.com/blog/open-source-llms-landscape-2026/
  6. SEA-HELM Leaderboard leaderboard.sea-lion.ai/detailed/SEA https://leaderboard.sea-lion.ai/detailed/SEA
  7. SEA-HELM Leaderboard leaderboard.sea-lion.ai/detailed/ID https://leaderboard.sea-lion.ai/detailed/ID
  8. docs.mistral.ai/getting-started/changelog https://docs.mistral.ai/getting-started/changelog/
  9. huggingface.co/api/models/mistralai/Mistral-Medium-3.5-128B https://huggingface.co/api/models/mistralai/Mistral-Medium-3.5-128B
  10. mistral.ai/news https://mistral.ai/news
  11. huggingface.co/mistralai/Mistral-Medium-3.5-128B/raw/main/LI... https://huggingface.co/mistralai/Mistral-Medium-3.5-128B/raw/main/LICENSE
  12. huggingface.co/mistralai/Devstral-2-123B-Instruct-2512/raw/m... https://huggingface.co/mistralai/Devstral-2-123B-Instruct-2512/raw/main/LICENSE

To cite this page: Project AURION, AI Use-Cases Research & Innovation, "Mistral Medium 3.5 (v26.04)", https://aurion.semai.id/models/mistral-ai-mistral-medium-3-5/, records of October 2026.