Noometry

Model comparison

Gemini 2.5 Flash-Lite vs GPT-5.5 Instant

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 36.4 on the Noometry Index.

Last verified . 19 shared benchmarks.

Gemini 2.5 Flash-Lite Google

36.4

Rank #208 Confirmed

GPT-5.5 Instant OpenAI

42.5

Rank #99 Confirmed

Summary

  • They share 19 benchmarks with published results for both. Gemini 2.5 Flash-Lite scores higher in 1 category and GPT-5.5 Instant in 8 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 32.1.

Side by side

Gemini 2.5 Flash-LiteGPT-5.5 Instant
ProviderGoogleOpenAI
Noometry Index36.442.5
Released2025-06-172026-05-05
WeightsProprietaryProprietary
Context window1.05M—
Max output66K—
Input $ / M tokens$0.10—
Output $ / M tokens$0.40—
Results tracked3327

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Category by category

Coding GPT-5.5 Instant leads

Gemini 2.5 Flash-Lite: 38.0 (#167), GPT-5.5 Instant: 43.7 (#73)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Coding13731433
SciCode—48.6%
WeirdML35.2%—
ALE-Bench325.9—

Agentic & Tool Use Not comparable

Gemini 2.5 Flash-Lite: 27.8 (#89), GPT-5.5 Instant: —

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
Berkeley Function Calling Leaderboard36.9%—

Reasoning GPT-5.5 Instant leads

Gemini 2.5 Flash-Lite: 21.5 (#196), GPT-5.5 Instant: 24.2 (#149)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Hard Prompts13771426
Epoch Capabilities Index133.93142.48
Kagi LLM Benchmark40.5%—
CritPt—0%
Chess Puzzles—12%
DTBench62.8%—
LMCA18.1%—

Math Gemini 2.5 Flash-Lite leads

Gemini 2.5 Flash-Lite: 35.5 (#144), GPT-5.5 Instant: 26.1 (#241)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Math13731420
FrontierMath (Tiers 1-3)—26.3%
FrontierMath Tier 4—2.4%
OTIS Mock AIME 2024-2025—68.1%
Omni-MATH48%—

Knowledge GPT-5.5 Instant leads

Gemini 2.5 Flash-Lite: 32.1 (#206), GPT-5.5 Instant: 48.9 (#68)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Expert13731409
GPQA Diamond—82.5%
MMLU-Pro53.7%—
Vectara Hallucination Rate3.3%—
GPQA (HELM)30.9%—

Multimodal GPT-5.5 Instant leads

Gemini 2.5 Flash-Lite: 28.6 (#109), GPT-5.5 Instant: 39.3 (#48)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Vision11981250
VPCT30%—
LMArena Document—1403

Multilingual GPT-5.5 Instant leads

Gemini 2.5 Flash-Lite: 49.5 (#129), GPT-5.5 Instant: 53.0 (#76)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Non-English13691417
LMArena Chinese14041457
LMArena French13881428
LMArena German13901410
LMArena Japanese13591408
LMArena Korean13581393
LMArena Russian13731430
LMArena Spanish13961430

Instruction Following GPT-5.5 Instant leads

Gemini 2.5 Flash-Lite: 70.2 (#163), GPT-5.5 Instant: 74.4 (#94)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Instruction Following13661407
IFEval81%—

Long Context GPT-5.5 Instant leads

Gemini 2.5 Flash-Lite: 33.3 (#257), GPT-5.5 Instant: 43.4 (#92)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Longer Query13731422
Fiction.LiveBench47.2%—

Writing & Preference GPT-5.5 Instant leads

Gemini 2.5 Flash-Lite: 57.0 (#130), GPT-5.5 Instant: 62.0 (#81)

BenchmarkGemini 2.5 Flash-LiteGPT-5.5 Instant
LMArena Text13791419
LMArena Creative Writing13661420
LMArena Multi-Turn13671434
WildBench81.8%—

Frequently asked questions

Is Gemini 2.5 Flash-Lite better than GPT-5.5 Instant?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 36.4 on the Noometry Index.

Is Gemini 2.5 Flash-Lite or GPT-5.5 Instant better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 38.0 in the Noometry coding category.

How many benchmarks do Gemini 2.5 Flash-Lite and GPT-5.5 Instant share?

19 benchmarks have published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and GPT-5.5 Instant has 27.

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