Noometry

Model comparison

GPT-5.5 Instant vs Mistral Small

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 33.1 on the Noometry Index.

Last verified . 22 shared benchmarks.

GPT-5.5 Instant OpenAI

42.5

Rank #99 Confirmed

Mistral Small Mistral AI

33.1

Rank #238 Confirmed

Summary

  • They share 22 benchmarks with published results for both. GPT-5.5 Instant scores higher in 9 categories and Mistral Small in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 30.9.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 5.8% for Mistral Small.
  • Mistral Small has downloadable open weights; the other is API-only.

Side by side

GPT-5.5 InstantMistral Small
ProviderOpenAIMistral AI
Noometry Index42.533.1
Released2026-05-052024-02-26
WeightsProprietaryOpen
Context window—256K
Max output—256K
Input $ / M tokens—$0.15
Output $ / M tokens—$0.60
Results tracked2739

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Category by category

Coding GPT-5.5 Instant leads

GPT-5.5 Instant: 43.7 (#73), Mistral Small: 33.5 (#242)

BenchmarkGPT-5.5 InstantMistral Small
SciCode48.6%26.5%
LMArena Coding14331363
BigCodeBench Instruct—36.1%
LiveBench Coding—36.2%
BigCodeBench Complete—46.6%
ALE-Bench—497.62

Agentic & Tool Use Not comparable

GPT-5.5 Instant: —, Mistral Small: 27.9 (#87)

BenchmarkGPT-5.5 InstantMistral Small
Berkeley Function Calling Leaderboard—37.1%

Reasoning GPT-5.5 Instant leads

GPT-5.5 Instant: 24.2 (#149), Mistral Small: 19.3 (#238)

BenchmarkGPT-5.5 InstantMistral Small
CritPt0%0%
LMArena Hard Prompts14261336
Kagi LLM Benchmark—37.8%
Chess Puzzles12%—
LiveBench Reasoning—44.8%
DTBench—70.9%
LiveBench Data Analysis—53.7%
LMCA—20.6%
Epoch Capabilities Index142.48—
LiveBench—44%

Math GPT-5.5 Instant leads

GPT-5.5 Instant: 26.1 (#241), Mistral Small: 15.4 (#287)

BenchmarkGPT-5.5 InstantMistral Small
OTIS Mock AIME 2024-202568.1%5.8%
LMArena Math14201341
FrontierMath (Tiers 1-3)26.3%—
FrontierMath Tier 42.4%—
LiveBench Math—39.9%
MATH Level 5—46.8%

Knowledge GPT-5.5 Instant leads

GPT-5.5 Instant: 48.9 (#68), Mistral Small: 30.9 (#214)

BenchmarkGPT-5.5 InstantMistral Small
GPQA Diamond82.5%47.5%
LMArena Expert14091293
Vectara Hallucination Rate—5.1%
MMLU—68.7%

Multimodal GPT-5.5 Instant leads

GPT-5.5 Instant: 39.3 (#48), Mistral Small: 32.9 (#91)

BenchmarkGPT-5.5 InstantMistral Small
LMArena Vision12501142
LMArena Document1403—

Multilingual GPT-5.5 Instant leads

GPT-5.5 Instant: 53.0 (#76), Mistral Small: 45.7 (#164)

BenchmarkGPT-5.5 InstantMistral Small
LMArena Non-English14171315
LMArena Chinese14571342
LMArena French14281337
LMArena German14101341
LMArena Japanese14081275
LMArena Korean13931260
LMArena Russian14301324
LMArena Spanish14301346

Instruction Following GPT-5.5 Instant leads

GPT-5.5 Instant: 74.4 (#94), Mistral Small: 66.6 (#204)

BenchmarkGPT-5.5 InstantMistral Small
LMArena Instruction Following14071310
LiveBench Instruction Following—63.7%

Long Context GPT-5.5 Instant leads

GPT-5.5 Instant: 43.4 (#92), Mistral Small: 40.4 (#151)

BenchmarkGPT-5.5 InstantMistral Small
LMArena Longer Query14221327

Writing & Preference GPT-5.5 Instant leads

GPT-5.5 Instant: 62.0 (#81), Mistral Small: 52.6 (#165)

BenchmarkGPT-5.5 InstantMistral Small
LMArena Text14191338
LMArena Creative Writing14201304
LMArena Multi-Turn14341344
LiveBench Language—30.5%

Frequently asked questions

Is GPT-5.5 Instant better than Mistral Small?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 33.1 on the Noometry Index.

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

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 33.5 in the Noometry coding category.

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

22 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Mistral Small has 39.

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