Noometry

Model comparison

Gemini 2.5 Flash-Lite vs GPT-6 Luna

GPT-6 Luna is the stronger model overall, scoring 53.3 to 37.0 on the Noometry Index.

Last verified . 22 shared benchmarks.

Gemini 2.5 Flash-Lite Google

37.0

Rank #211 Confirmed

GPT-6 Luna OpenAI

53.3

Rank #36 Confirmed

Summary

  • They share 22 benchmarks with published results for both. Gemini 2.5 Flash-Lite scores higher in 0 categories and GPT-6 Luna in 10 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-6 Luna leads 76.1 to 38.0.
  • The biggest single-benchmark swing is DTBench: 62.8% for Gemini 2.5 Flash-Lite and 90.1% for GPT-6 Luna.
  • Gemini 2.5 Flash-Lite is cheaper at $0.10 / $0.40 per million input/output tokens, against $0.10 / $0.50 for GPT-6 Luna.
  • GPT-6 Luna accepts more context: 1.05M tokens versus 1.05M.

Side by side

Gemini 2.5 Flash-LiteGPT-6 Luna
ProviderGoogleOpenAI
Noometry Index37.053.3
Released2025-06-172026-09-22
WeightsProprietaryProprietary
Context window1.05M1.05M
Max output66K128K
Input $ / M tokens$0.10$0.10
Output $ / M tokens$0.40$0.50
Results tracked3342

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Category by category

Coding GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 38.5 (#173), GPT-6 Luna: 55.5 (#25)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Coding13731439
ALE-Bench325.91,577
DeepSWE—66.6%
FrontierCode—42.4%
LMArena WebDev—1581
SciCode—54.6%
WeirdML35.2%—

Agentic & Tool Use GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 28.0 (#96), GPT-6 Luna: 33.3 (#54)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
APEX-Agents—44.3%
Berkeley Function Calling Leaderboard36.9%—
GDP.pdf—23%

Reasoning GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 22.2 (#205), GPT-6 Luna: 48.2 (#41)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Hard Prompts13771411
DTBench62.8%90.1%
LMCA18.1%44.5%
Epoch Capabilities Index133.94156.28
ARC-AGI-2—59.3%
Kagi LLM Benchmark40.5%—
NYT Connections (extended)—68.7%
ARC-AGI-1—86.7%
CritPt—19.4%
Chess Puzzles—31%
Mystery Game Puzzles—7%

Math GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 38.0 (#144), GPT-6 Luna: 76.1 (#15)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Math13731416
FrontierMath (Tiers 1-3)—78.9%
FrontierMath Tier 4—56.1%
OTIS Mock AIME 2024-2025—98.9%
ProofBench—64%
Omni-MATH48%—

Knowledge GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 32.5 (#210), GPT-6 Luna: 57.0 (#41)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Expert13731444
GPQA Diamond—90.5%
SimpleQA Verified—41.4%
MMLU-Pro53.7%—
Vectara Hallucination Rate3.3%—
GPQA (HELM)30.9%—

Multimodal GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 29.1 (#114), GPT-6 Luna: 42.4 (#30)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Vision11981217
VPCT30%—
Blueprint-Bench 2—31.2%
Furniture Assembly—44.2%

Multilingual GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 49.3 (#134), GPT-6 Luna: 50.5 (#117)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Non-English13691386
LMArena Chinese14041433
LMArena French13881420
LMArena German13891369
LMArena Japanese13591369
LMArena Korean13601360
LMArena Russian13731394
LMArena Spanish13961393

Instruction Following GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 70.0 (#168), GPT-6 Luna: 74.3 (#99)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Instruction Following13671409
IFEval81%—

Long Context GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 33.3 (#262), GPT-6 Luna: 43.0 (#111)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Longer Query13731409
Fiction.LiveBench47.2%—

Writing & Preference GPT-6 Luna leads

Gemini 2.5 Flash-Lite: 56.8 (#135), GPT-6 Luna: 58.3 (#119)

BenchmarkGemini 2.5 Flash-LiteGPT-6 Luna
LMArena Text13791391
LMArena Creative Writing13671363
LMArena Multi-Turn13661396
WildBench81.8%—

Frequently asked questions

Is Gemini 2.5 Flash-Lite better than GPT-6 Luna?

GPT-6 Luna is the stronger model overall, scoring 53.3 to 37.0 on the Noometry Index.

Which is cheaper, Gemini 2.5 Flash-Lite or GPT-6 Luna?

Gemini 2.5 Flash-Lite is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; GPT-6 Luna lists at $0.10 and $0.50.

Is Gemini 2.5 Flash-Lite or GPT-6 Luna better for coding?

GPT-6 Luna scores higher on coding benchmarks: 55.5 versus 38.5 in the Noometry coding category.

Which has the bigger context window?

GPT-6 Luna does, with 1.05M tokens against 1.05M.

How many benchmarks do Gemini 2.5 Flash-Lite and GPT-6 Luna share?

22 benchmarks have published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and GPT-6 Luna has 42.

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