Noometry

Model comparison

GPT-5.5 Instant vs Mistral Small 3

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 30.9 on the Noometry Index.

Last verified . 20 shared benchmarks.

GPT-5.5 Instant OpenAI

42.5

Rank #99 Confirmed

Mistral Small 3 Mistral AI

30.9

Rank #268 Confirmed

Summary

  • They share 20 benchmarks with published results for both. GPT-5.5 Instant scores higher in 8 categories and Mistral Small 3 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where GPT-5.5 Instant leads 62.0 to 32.4.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 6.7% for Mistral Small 3.
  • Mistral Small 3 has downloadable open weights; the other is API-only.

Side by side

GPT-5.5 InstantMistral Small 3
ProviderOpenAIMistral AI
Noometry Index42.530.9
Released2026-05-052025-01-30
WeightsProprietaryOpen
Context window—33K
Max output—16K
Input $ / M tokens—$0.05
Output $ / M tokens—$0.08
Results tracked2724

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding GPT-5.5 Instant leads

GPT-5.5 Instant: 43.7 (#73), Mistral Small 3: 36.0 (#203)

BenchmarkGPT-5.5 InstantMistral Small 3
LMArena Coding14331246
SciCode48.6%—
BigCodeBench Instruct—45.3%
BigCodeBench Complete—50.4%

Reasoning GPT-5.5 Instant leads

GPT-5.5 Instant: 24.2 (#149), Mistral Small 3: 18.2 (#269)

BenchmarkGPT-5.5 InstantMistral Small 3
Chess Puzzles12%0%
LMArena Hard Prompts14261233
Epoch Capabilities Index142.48127.06
CritPt0%—

Math GPT-5.5 Instant leads

GPT-5.5 Instant: 26.1 (#241), Mistral Small 3: 15.3 (#290)

BenchmarkGPT-5.5 InstantMistral Small 3
OTIS Mock AIME 2024-202568.1%6.7%
LMArena Math14201240
FrontierMath (Tiers 1-3)26.3%—
FrontierMath Tier 42.4%—

Knowledge GPT-5.5 Instant leads

GPT-5.5 Instant: 48.9 (#68), Mistral Small 3: 25.0 (#258)

BenchmarkGPT-5.5 InstantMistral Small 3
GPQA Diamond82.5%47.3%
LMArena Expert14091202
Confabulations—25.2%

Multimodal Not comparable

GPT-5.5 Instant: 39.3 (#48), Mistral Small 3: —

BenchmarkGPT-5.5 InstantMistral Small 3
LMArena Vision1250—
LMArena Document1403—

Multilingual GPT-5.5 Instant leads

GPT-5.5 Instant: 53.0 (#76), Mistral Small 3: 37.5 (#231)

BenchmarkGPT-5.5 InstantMistral Small 3
LMArena Non-English14171198
LMArena Chinese14571204
LMArena French14281202
LMArena German14101211
LMArena Japanese14081111
LMArena Korean13931188
LMArena Russian14301216
LMArena Spanish1430—

Instruction Following GPT-5.5 Instant leads

GPT-5.5 Instant: 74.4 (#94), Mistral Small 3: 63.9 (#224)

BenchmarkGPT-5.5 InstantMistral Small 3
LMArena Instruction Following14071214

Long Context GPT-5.5 Instant leads

GPT-5.5 Instant: 43.4 (#92), Mistral Small 3: 37.8 (#206)

BenchmarkGPT-5.5 InstantMistral Small 3
LMArena Longer Query14221246

Writing & Preference GPT-5.5 Instant leads

GPT-5.5 Instant: 62.0 (#81), Mistral Small 3: 32.4 (#275)

BenchmarkGPT-5.5 InstantMistral Small 3
LMArena Text14191234
LMArena Creative Writing14201195
LMArena Multi-Turn14341217
EQ-Bench Creative Writing—707

Frequently asked questions

Is GPT-5.5 Instant better than Mistral Small 3?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 30.9 on the Noometry Index.

Is GPT-5.5 Instant or Mistral Small 3 better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 36.0 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and Mistral Small 3 share?

20 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Mistral Small 3 has 24.

Related comparisons

Go deeper