Mistral Medium 3.5

Mistral AI
New in Mistral Medium 3.5 is the combination of 128 billion dense parameters, text and image input, and a 256,000-token context window.
Mistral describes Medium 3.5 as the successor to Mistral Medium 3.1. The Modified MIT license sets the deployment terms.
| Specification | Value and source |
|---|---|
| Weights | Open weightsSource |
| Access | API, LocalSource |
| Parameters | 128BSource |
| Context window | 262,144 tokensSource |
| Notes | Coding-focused current API model; dense 128B modelSource |
| Provider model name | Mistral Medium 3.5Source |
| License | Modified MITSource |
| Release | 2026-04-28Source |
| API model ID | mistral-medium-3-5Source |
| Parameters | 128 BSource |
| Architecture | dense transformerSource |
| Input | Text, ImageSource |
| Output | TextSource |
| Reasoning mode | YesSource |
| Tool calling | YesSource |
| Structured output | YesSource |
Benchmark meta-analysis
These Gradually indexes place selected published measurements on a 0 to 100 scale. They are not accuracy percentages and do not guarantee results in your application.
Retrieval dates of the sources used 2026-10-15 - 2026-10-19
Not enough coverage for a score yet
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Not enough coverage for a score yet
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Not enough coverage for a score yet
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Not enough coverage for a score yet
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Index 18.0 / 100
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Not enough coverage for a score yet
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Not enough coverage for a score yet
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Index 10.3 / 100
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Index 16.9 / 100
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Index 11.1 / 100
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Not enough coverage for a score yet
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Not enough coverage for a score yet
provisional
Published configurations differ within this comparison cohort. Treat the index as provisional.
Method version: benchmark-meta-score-v1
The index includes active measurements from reviewed primary sources when at least five models are compared in the same documented comparison slice across dataset, harness, agent, tools, and trial count. Each benchmark series and evaluator contributes one shared setup slice from the newest capture; when dates match, the wider slice is used. When one source and series include several explicitly documented reasoning tiers, the highest documented tier (none through max) is selected, never the best result value. The explicit source label “Non-reasoning” is treated as none. When selecting between multiple results, unknown or ambiguous tiers exclude the model from that series. Unambiguous single configurations do not require a tier ordering. The best individual result for each model is not selected. Equal raw values share the same rank percentile. Multiple series from the same evaluator within a family receive equal weight; evaluators within a family, families within an area, and areas in the overall index then receive equal weight. Unmeasured series remain visible in coverage and bounds. An overall score requires at least four areas, six test families, and two sources. An area score requires at least two test families. Every overall and area score also requires at least 50% of its panel weight.
Published model-specific parameters can differ. This is not a controlled experiment; comparisons with such differences are marked provisional.
Unmeasured portions are not entered as zero. They reduce coverage and contribute only to the displayed bounds. Scores with different coverage are therefore not equally complete.
The bounds hold observed percentiles fixed and allow missing contributions anywhere from 0 to 100. They are not confidence intervals or predictions of future recalculations.
The source count is not a count of independent experiments.
OECD handbook on composite indicatorsAll 31 test families and 12 of 33 raw measurements are listed here. The complete calculation for every model is available in the JSON export.
Nominal family weight in the overall panel: 0.6 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 0.6 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 0.6 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 0.6 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 1.43 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 2.38 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 50 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 50 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 0.48 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 1.43 % · Coverage of this test family: 100 %
Published configurations differ within this cohort.
Nominal family weight in the overall panel: 1.79 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.79 % · Coverage of this test family: 50 %
Nominal family weight in the overall panel: 0.48 % · Coverage of this test family: 50 %
Nominal family weight in the overall panel: 0.48 % · Coverage of this test family: 83 %
Nominal family weight in the overall panel: 0.48 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.79 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.79 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 2.38 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 2.38 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 2.38 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.43 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 3.57 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 1.02 % · Coverage of this test family: 100 %
Nominal family weight in the overall panel: 0.48 % · Coverage of this test family: 100 %
Each evaluator measures different capabilities under its own conditions. Test series, composite indices and their components stay separate. The detailed results below retain their scales, configurations and source dates.
| Evaluator | Test series | Composite indices | Recorded active measurements |
|---|---|---|---|
| Artificial Analysis | 11 | 1 | 14 |
| Vals AI | 20 | 1 | 166 |
| LMArena | 3 | 0 | 40 |
Coverage is not a quality ranking. Overlapping tests and multiple settings do not count as independent experiments. Vendor claims, historical and disputed results are excluded from this overview and remain labelled in the detailed evidence.
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Overall
502 technical decision points from engineering and research workflows. Each choice is presented in both answer orders. The overall score averages engineering and research and requires both answer orders to be correct. Unparseable responses count as wrong. Reasoning settings and output budget are part of the setup.
Note (Mistral Medium 3.5): 24 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 0 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 0 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 0 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 10 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 0 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 17 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 0 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 0 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 3 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 2 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 112 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 93 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
Note: 459 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
higher is betterAs of September 26, 2026Scale: 0% - 100%
Overall
higher is betterAs of October 15, 2026Scale: 0% - 100%
Overall
higher is betterAs of October 15, 2026Scale: 0% - 100%
| Sub-task | Mistral Medium 3.5 (This model) | Grok 4.5 | Grok 4.6 |
|---|---|---|---|
| Automata | 30.16% | 32.54% (best value in this row) | 32.14% |
| Calculus | 2.78% | 59.57% | 61.73% (best value in this row) |
| Linear Algebra | 41.41% | 46.96% (best value in this row) | 41.06% |
| Overall | 37.61% (best value in this row) | 34.97% | 28.9% |
| Partial Differential Equations | 41.27% (best value in this row) | 25.4% | 13.49% |
higher is betterAs of October 15, 2026Source: Vals AIbars scaled within each row, not across rows
SWE-bench
higher is betterAs of October 15, 2026Scale: 0% - 100%
These measurements have no matching peer values under the same test conditions. Their original values and sources remain available here.
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One SVG prompt and fixed output settings. Captures are shown only with 0 reported reasoning tokens or documented lack of reasoning controls. Identical test conditions do not make the models' internal compute identical.

A community classic for free-form SVG drawing.
Mistral Medium 3.5

Reasoning (requested): high
Visually reviewed. This individual test does not establish overall model quality.
Generate an SVG of a pelican riding a bicycle
Token limit including reasoning: 8,192 tokens
Task origin (Simon Willison)39.6 / 100
Official documentation
Mistral's own model card states Mistral Medium 3.5 replaces its predecessor Mistral Medium 3.1 and Magistral in Le Chat, explicitly naming Mistral Medium 3.1 (released August 2025) as the direct predecessor; this profile's own directory name is Mistral Medium 3.5.
Mistral Medium 3.5 model card (Hugging Face) (2026-09-19)