Mistral Medium 3.5
Mistral Medium 3.5 (Mistral AI) was released on Apr 28, 2026. In the Epoch AI capability ranking (ECI), it ranks #117 out of 267 models, with 141.47. On Arena, which measures human preference in blind comparisons, it has 1,461 ELO points (#83).
Where Mistral Medium 3.5 stands out and where it falls behind, by the numbers
Mistral Medium 3.5 has published results on 10 tests compiled by Epoch AI. The yardstick here is its generation: its position among the models released between Aug 1, 2025 and Jul 27, 2026 that took the same test. Against the whole archive, which includes 2023 models, a recent release lands near the top of almost everything, and that says nothing.
Where it stands out
Tests where it sits in the top third of its own generation.
It is not in the top third of its generation on any test with 6 or more models compared.
Where it falls behind
Tests where it sits in the bottom half of its own generation.
See all 10 tests, one by one
| Test | Score | In its generation | Overall | Test record |
|---|---|---|---|---|
| Dtbench | 75.5% | #59 / 66 | #84 / 148 | 98.9% Claude Opus 5.5 |
| Lmca | 26.06 | #59 / 64 | #83 / 121 | 68.23 Claude Opus 5.5 |
| CritPt | 0.0% | #55 / 60 (tied with 5) | #91 / 112 | 32.3% GPT-5.6 Sol |
| WeirdML | 43.7% | #46 / 59 | #62 / 112 | 93.6% GPT-6 Astra |
| SciCode | 40.2% | #46 / 56 | #76 / 104 | 66.9% Claude Opus 5.5 |
| ALE-Bench | 764 | #41 / 58 | #60 / 82 | 2,951 GPT-6 Astra |
| WebDev Arena | 1,265 | #55 / 59 | #77 / 82 | 1,820 Claude Opus 5.5 |
| ProofBench | 9.0% | #37 / 46 (tied with 1) | #64 / 74 | 100.0% Claude Fable 5.1 |
| FrontierCode | 8.0% | #23 / 23 | #43 / 43 | 54.6% Claude Opus 5.5 |
| Surface Evolver Bench | 26.9% | #18 / 19 | #23 / 24 | 95.0% Claude Fable 5 |
For each test, the model's best effort level counts, as in the ranking. Source of the scores: Epoch AI, under CC BY 4.0.
What to compare Mistral Medium 3.5 with
The models from other labs closest in capability and released in the same period, at most two per lab. Click any of them to see its page.
| Model | Lab | ECI | ELO | LiveBench | Release |
|---|---|---|---|---|---|
| Qwen3-Max-Instruct | Alibaba | 142.46 | n/a | n/a | Sep 24, 2025 |
| GPT-5.5 Instant | OpenAI | 142.45 | 1,456 | n/a | May 5, 2026 |
| Claude Haiku 4.5 | Anthropic | 142.40 | 1,454 | n/a | Oct 15, 2025 |
| Qwen3-Max | Alibaba | 142.34 | 1,478 | n/a | Sep 24, 2025 |
| Gemma 4 26B A4B | Google DeepMind | 141.81 | 1,495 | n/a | Apr 2, 2026 |
| Mistral Medium 3.5 | Mistral AI | 141.47 | 1,461 | n/a | Apr 28, 2026 |
| GLM-4.6 | Z.ai (Zhipu AI) | 140.78 | 1,500 | n/a | Sep 30, 2025 |
Mistral Medium 3.5 or Gemma 4 26B A4B?
Gemma 4 26B A4B is the model from another lab closest to Mistral Medium 3.5 in capability. Across the 7 tests both took, this is the score:
| Test | Mistral Medium 3.5 | Gemma 4 26B A4B |
|---|---|---|
| WeirdML | 43.7% | 35.2% |
| ALE-Bench | 764 | 927 |
| Lmca | 26.06 | 29.68 |
| WebDev Arena | 1,265 | 1,361 |
| Dtbench | 75.5% | 74.9% |
| SciCode | 40.2% | 40.0% |
| CritPt | 0.0% | 0.0% |
Unweighted score: each test counts one point, whether math or coding. The dot marks who did better on each row.
Other models from Mistral AI
The models from the same lab closest in time, newest first.
| Model | Release | ECI | ELO | LiveBench | Access |
|---|---|---|---|---|---|
| Mistral Large 4 | Oct 6, 2026 | 146.90 | 1,494 | 71.8 | Unknown |
| Mistral Medium 3.5 | Apr 28, 2026 | 141.47 | 1,461 | n/a | Open weights (restricted use) |
| Magistral Small 1.2 | Sep 18, 2025 | 131.43 | n/a | n/a | Open weights (unrestricted) |
| Mistral Medium 3.1 | Aug 12, 2025 | 135.67 | n/a | n/a | API access |
| Mistral Small 3.2 | Jun 20, 2025 | 131.75 | n/a | n/a | Open weights (unrestricted) |
| Magistral Small 1.0 | Jun 10, 2025 | 133.20 | n/a | n/a | Open weights (unrestricted) |
| Mistral Medium 3 | May 7, 2025 | 134.06 | n/a | n/a | API access |
| Mistral Small 3.1 | Mar 17, 2025 | 127.49 | n/a | n/a | Open weights (unrestricted) |
| Mistral Small 3 | Jan 30, 2025 | 127.08 | n/a | n/a | Open weights (unrestricted) |
Have you used Mistral Medium 3.5? Rate it
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What people ask about Mistral Medium 3.5
Where does Mistral Medium 3.5 rank among AI models?
In the ROO3 AI Benchmark, ordered by the Epoch AI ECI, Mistral Medium 3.5 ranks #117 out of 267 models, with an ECI of 141.47. The ECI is a composite index that combines several hard benchmarks into a single scale. The position changes when a new model comes out, and the page is refreshed six times a day.
Is Mistral Medium 3.5 better than Gemma 4 26B A4B?
Across the 7 tests both models took and Epoch AI compiled, Mistral Medium 3.5 comes out ahead on 3, behind on 3 and tied on 1. It is a test-by-test count with no weighting: a win in math counts the same as a win in coding. To choose between the two, look at the tests that resemble your own use.
Where do the numbers on this page come from?
From the same three sources as the ranking, all openly licensed: Epoch AI (ECI and individual tests, CC BY 4.0), Arena (human-preference ELO, CC BY 4.0) and LiveBench (overall average, CC BY-SA 4.0). ROO3 does not measure any model. When the page shows a figure published by the maker itself, it appears in the written analysis, labeled as the maker's, and never enters the ranking.
Where each number comes from
Epoch AI, "AI Benchmarking Hub". Published at epoch.ai. Data under the CC BY 4.0 licence, reordered by roo3.co.
The Arena (LMArena) leaderboard, from the public lmarena-ai/leaderboard-dataset on Hugging Face, under the CC BY 4.0 licence. We are not affiliated with the Arena.
LiveBench, by the LiveBench team, published at livebench.ai under the CC BY-SA 4.0 license. The overall average is recomputed by roo3.co with the same formula as the website (average of the categories), and those numbers stay under CC BY-SA 4.0. We are not affiliated with LiveBench.
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