Model comparison

GPT-6 Sol vs Mistral Medium 3.5

GPT-6 Sol is the stronger model overall, scoring 61.8 to 40.2 on the Noometry Index.

Last verified October 10, 2026. 20 shared benchmarks.

GPT-6 Sol OpenAI

61.8

Rank #12 Confirmed

Mistral Medium 3.5

Mistral AI

40.2

Rank #152 Confirmed

Summary

They share 20 benchmarks with published results for both. GPT-6 Sol scores higher in 6 categories and Mistral Medium 3.5 in 3 categories; 7 gaps are clear of the uncertainty.
The widest gap is in reasoning, where GPT-6 Sol leads 74.0 to 17.3.
The biggest single-benchmark swing is NYT Connections (extended): 90.1% for GPT-6 Sol and 12.9% for Mistral Medium 3.5.
Mistral Medium 3.5 is cheaper at $1.50 / $7.50 per million input/output tokens, against $2 / $10 for GPT-6 Sol.
GPT-6 Sol accepts more context: 1.05M tokens versus 262K.
Mistral Medium 3.5 has downloadable open weights; the other is API-only.

Side by side

GPT-6 Sol and Mistral Medium 3.5 specifications
	GPT-6 Sol	Mistral Medium 3.5
Provider	OpenAI	Mistral AI
Noometry Index	61.8	40.2
Released	2026-09-22	—
Weights	Proprietary	Open
Context window	1.05M	262K
Max output	128K	210K
Input $ / M tokens	$2	$1.50
Output $ / M tokens	$10	$7.50
Results tracked	45	22

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Category by category

Coding GPT-6 Sol leads

GPT-6 Sol: 60.1 (#11), Mistral Medium 3.5: 36.0 (#213)

Coding benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
LMArena WebDev	1688	1264
LMArena Coding	1447	1461
DeepSWE	68.8%	—
FrontierCode	49.3%	—
SciCode	57.6%	—
ALE-Bench	2,462	—

Agentic & Tool Use Not comparable

GPT-6 Sol: 37.2 (#36), Mistral Medium 3.5: —

Agentic & Tool Use benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
APEX-Agents	54.3%	—
GDP.pdf	26.4%	—
Vending-Bench 2	14,428	—

Reasoning GPT-6 Sol leads

GPT-6 Sol: 74.0 (#9), Mistral Medium 3.5: 17.3 (#295)

Reasoning benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
NYT Connections (extended)	90.1%	12.9%
LMArena Hard Prompts	1418	1436
Epoch Capabilities Index	162.72	141.35
ARC-AGI-2	89.6%	—
Kagi LLM Benchmark	—	41.4%
ARC-AGI-1	95.5%	—
CritPt	30.9%	—
EBR-Bench	53.3%	—
Mystery Game Puzzles	56%	—
DTBench	97.3%	—
LMCA	59.1%	—

Math GPT-6 Sol leads

GPT-6 Sol: 87.2 (#7), Mistral Medium 3.5: 39.1 (#113)

Math benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
LMArena Math	1402	1431
FrontierMath (Tiers 1-3)	89.8%	—
FrontierMath Tier 4	90%	—
OTIS Mock AIME 2024-2025	100%	—
ProofBench	83%	—

Knowledge GPT-6 Sol leads

GPT-6 Sol: 64.8 (#15), Mistral Medium 3.5: 40.0 (#126)

Knowledge benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
LMArena Expert	1439	1432
GPQA Diamond	94.3%	—
SimpleQA Verified	60.7%	—
Vectara Hallucination Rate	6.5%	—

Multimodal GPT-6 Sol leads

GPT-6 Sol: 47.6 (#10), Mistral Medium 3.5: 38.3 (#65)

Multimodal benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
LMArena Vision	1245	1223
Blueprint-Bench 2	36.9%	—
Furniture Assembly	58.3%	—

Multilingual Mistral Medium 3.5 leads

GPT-6 Sol: 50.5 (#118), Mistral Medium 3.5: 51.9 (#100)

Multilingual benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
LMArena Non-English	1385	1404
LMArena Chinese	1405	1442
LMArena French	1410	1448
LMArena German	1390	1451
LMArena Korean	1341	1385
LMArena Russian	1401	1395
LMArena Spanish	1384	1409
LMArena Japanese	1385	—

Instruction Following Too close to call

GPT-6 Sol: 74.5 (#94), Mistral Medium 3.5: 74.6 (#90)

Instruction Following benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
LMArena Instruction Following	1412	1415

Long Context Too close to call

GPT-6 Sol: 43.1 (#108), Mistral Medium 3.5: 43.2 (#103)

Long Context benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
LMArena Longer Query	1411	1415

Writing & Preference GPT-6 Sol leads

GPT-6 Sol: 71.9 (#18), Mistral Medium 3.5: 58.5 (#117)

Writing & Preference benchmarks
Benchmark	GPT-6 Sol	Mistral Medium 3.5
LMArena Text	1395	1421
LMArena Creative Writing	1378	1374
LMArena Multi-Turn	1412	1423
EQ-Bench Creative Writing	2125	—
EQ-Bench 4	—	993

Frequently asked questions

Is GPT-6 Sol better than Mistral Medium 3.5?

GPT-6 Sol is the stronger model overall, scoring 61.8 to 40.2 on the Noometry Index.

Which is cheaper, GPT-6 Sol or Mistral Medium 3.5?

Mistral Medium 3.5 is cheaper. It lists at $1.50 per million input tokens and $7.50 per million output tokens; GPT-6 Sol lists at $2 and $10.

Is GPT-6 Sol or Mistral Medium 3.5 better for coding?

GPT-6 Sol scores higher on coding benchmarks: 60.1 versus 36.0 in the Noometry coding category.

Which has the bigger context window?

GPT-6 Sol does, with 1.05M tokens against 262K.

How many benchmarks do GPT-6 Sol and Mistral Medium 3.5 share?

20 benchmarks have published results for both models. GPT-6 Sol has 45 scored results on Noometry and Mistral Medium 3.5 has 22.