Model comparison

GPT-6 Sol vs Mistral Small 3

GPT-6 Sol is the stronger model overall, scoring 61.8 to 31.2 on the Noometry Index. Mistral Small 3 costs 70× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.

Last verified October 10, 2026. 20 shared benchmarks.

GPT-6 Sol OpenAI

61.8

Rank #12 Confirmed

Mistral Small 3

Mistral AI

31.2

Rank #278 Confirmed

Summary

They share 20 benchmarks with published results for both. GPT-6 Sol scores higher in 8 categories and Mistral Small 3 in 0 categories; 8 gaps are clear of the uncertainty.
The widest gap is in math, where GPT-6 Sol leads 87.2 to 16.3.
The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for GPT-6 Sol and 6.7% for Mistral Small 3.
Mistral Small 3 is cheaper at $0.05 / $0.08 per million input/output tokens, against $2 / $10 for GPT-6 Sol.
GPT-6 Sol accepts more context: 1.05M tokens versus 33K.
Mistral Small 3 has downloadable open weights; the other is API-only.

Side by side

GPT-6 Sol and Mistral Small 3 specifications
	GPT-6 Sol	Mistral Small 3
Provider	OpenAI	Mistral AI
Noometry Index	61.8	31.2
Released	2026-09-22	2025-01-30
Weights	Proprietary	Open
Context window	1.05M	33K
Max output	128K	16K
Input $ / M tokens	$2	$0.05
Output $ / M tokens	$10	$0.08
Results tracked	45	24

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Category by category

Coding GPT-6 Sol leads

GPT-6 Sol: 60.1 (#11), Mistral Small 3: 36.5 (#207)

Coding benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
LMArena Coding	1447	1246
DeepSWE	68.8%	—
FrontierCode	49.3%	—
LMArena WebDev	1688	—
SciCode	57.6%	—
BigCodeBench Instruct	—	45.3%
BigCodeBench Complete	—	50.4%
ALE-Bench	2,462	—

Agentic & Tool Use Not comparable

GPT-6 Sol: 37.2 (#36), Mistral Small 3: —

Agentic & Tool Use benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
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 Small 3: 18.9 (#273)

Reasoning benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
LMArena Hard Prompts	1418	1233
Epoch Capabilities Index	162.72	127.07
ARC-AGI-2	89.6%	—
NYT Connections (extended)	90.1%	—
ARC-AGI-1	95.5%	—
CritPt	30.9%	—
Chess Puzzles	—	0%
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 Small 3: 16.3 (#295)

Math benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
OTIS Mock AIME 2024-2025	100%	6.7%
LMArena Math	1402	1240
FrontierMath (Tiers 1-3)	89.8%	—
FrontierMath Tier 4	90%	—
ProofBench	83%	—

Knowledge GPT-6 Sol leads

GPT-6 Sol: 64.8 (#15), Mistral Small 3: 25.1 (#263)

Knowledge benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
GPQA Diamond	94.3%	47.3%
LMArena Expert	1439	1202
SimpleQA Verified	60.7%	—
Confabulations	—	25.2%
Vectara Hallucination Rate	6.5%	—

Multimodal Not comparable

GPT-6 Sol: 47.6 (#10), Mistral Small 3: —

Multimodal benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
LMArena Vision	1245	—
Blueprint-Bench 2	36.9%	—
Furniture Assembly	58.3%	—

Multilingual GPT-6 Sol leads

GPT-6 Sol: 50.5 (#118), Mistral Small 3: 37.3 (#236)

Multilingual benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
LMArena Non-English	1385	1198
LMArena Chinese	1405	1204
LMArena French	1410	1203
LMArena German	1390	1211
LMArena Japanese	1385	1111
LMArena Korean	1341	1188
LMArena Russian	1401	1216
LMArena Spanish	1384	—

Instruction Following GPT-6 Sol leads

GPT-6 Sol: 74.5 (#94), Mistral Small 3: 63.7 (#229)

Instruction Following benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
LMArena Instruction Following	1412	1214

Long Context GPT-6 Sol leads

GPT-6 Sol: 43.1 (#108), Mistral Small 3: 37.8 (#211)

Long Context benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
LMArena Longer Query	1411	1246

Writing & Preference GPT-6 Sol leads

GPT-6 Sol: 71.9 (#18), Mistral Small 3: 32.2 (#280)

Writing & Preference benchmarks
Benchmark	GPT-6 Sol	Mistral Small 3
LMArena Text	1395	1234
LMArena Creative Writing	1378	1195
EQ-Bench Creative Writing	2125	707
LMArena Multi-Turn	1412	1217

Frequently asked questions

Is GPT-6 Sol better than Mistral Small 3?

Which is cheaper, GPT-6 Sol or Mistral Small 3?

Mistral Small 3 is cheaper. It lists at $0.05 per million input tokens and $0.08 per million output tokens; GPT-6 Sol lists at $2 and $10.

Is GPT-6 Sol or Mistral Small 3 better for coding?

GPT-6 Sol scores higher on coding benchmarks: 60.1 versus 36.5 in the Noometry coding category.

Which has the bigger context window?

GPT-6 Sol does, with 1.05M tokens against 33K.

How many benchmarks do GPT-6 Sol and Mistral Small 3 share?

20 benchmarks have published results for both models. GPT-6 Sol has 45 scored results on Noometry and Mistral Small 3 has 24.