Noometry

Model comparison

Gemini 2.5 Flash vs GPT-4o mini

Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 25.5 on the Noometry Index. GPT-4o mini costs 3.2× less per token, which makes it the better buy when Gemini 2.5 Flash's lead doesn't matter for your workload.

Last verified . 38 shared benchmarks.

Gemini 2.5 Flash Google

39.3

Rank #170 Confirmed

GPT-4o mini OpenAI

25.5

Rank #343 Confirmed

Summary

  • They share 38 benchmarks with published results for both. Gemini 2.5 Flash scores higher in 10 categories and GPT-4o mini in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in math, where Gemini 2.5 Flash leads 39.9 to 10.4.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 73.1% for Gemini 2.5 Flash and 6.9% for GPT-4o mini.
  • GPT-4o mini is cheaper at $0.15 / $0.60 per million input/output tokens, against $0.30 / $2.50 for Gemini 2.5 Flash.
  • Gemini 2.5 Flash accepts more context: 1.05M tokens versus 128K.

Side by side

Gemini 2.5 FlashGPT-4o mini
ProviderGoogleOpenAI
Noometry Index39.325.5
Released2025-04-172024-07-18
WeightsProprietaryProprietary
Context window1.05M128K
Max output66K16K
Input $ / M tokens$0.30$0.15
Output $ / M tokens$2.50$0.60
Results tracked5460

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Category by category

Coding Gemini 2.5 Flash leads

Gemini 2.5 Flash: 35.8 (#220), GPT-4o mini: 22.0 (#335)

BenchmarkGemini 2.5 FlashGPT-4o mini
Aider Polyglot55.1%3.6%
WeirdML41.9%11.8%
LMArena Coding14241290
SWE-bench Verified (bash only)28.7%—
BigCodeBench Instruct—46.1%
LiveBench Coding—43.1%
BigCodeBench Complete—57.4%
ALE-Bench661.88—
HumanEval+—83.5%
MBPP+—72.2%

Agentic & Tool Use Gemini 2.5 Flash leads

Gemini 2.5 Flash: 30.8 (#74), GPT-4o mini: 27.5 (#101)

BenchmarkGemini 2.5 FlashGPT-4o mini
BALROG33.5%17.4%
Terminal-Bench17.1%—
Berkeley Function Calling Leaderboard56.2%—
TheAgentCompany41.1%—
Vending-Bench 2548.84—

Reasoning Gemini 2.5 Flash leads

Gemini 2.5 Flash: 18.1 (#286), GPT-4o mini: 8.7 (#347)

BenchmarkGemini 2.5 FlashGPT-4o mini
ARC-AGI-22.5%0%
SimpleBench41.2%10.7%
Kagi LLM Benchmark56.8%28.8%
LMArena Hard Prompts14221267
DTBench76.5%54.4%
LMCA27.5%10.4%
Epoch Capabilities Index143.03126.56
ARC-AGI-133.3%—
CritPt1.1%—
Chess Puzzles—0%
EnigmaEval2.7%—
LiveBench Reasoning—32.8%
Mystery Game Puzzles—12%
LiveBench Data Analysis—50%
ForecastBench60.6—
LiveBench—41.3%
PIQA—88.7%

Math Gemini 2.5 Flash leads

Gemini 2.5 Flash: 39.9 (#98), GPT-4o mini: 10.4 (#314)

BenchmarkGemini 2.5 FlashGPT-4o mini
OTIS Mock AIME 2024-202573.1%6.9%
Omni-MATH38.5%28%
LMArena Math14151267
FrontierMath (Tiers 1-3)—0.7%
LiveBench Math—36.3%
MATH Level 5—52.6%
FrontierMath (Feb 2025 set)4.8%—
FrontierMath Tier 4 (v1)4.2%—
GSM8K—91.3%

Knowledge Gemini 2.5 Flash leads

Gemini 2.5 Flash: 36.4 (#168), GPT-4o mini: 17.7 (#284)

BenchmarkGemini 2.5 FlashGPT-4o mini
MMLU-Pro63.9%60.3%
Confabulations16.8%37.2%
GPQA (HELM)39%36.8%
LMArena Expert14261235
GPQA Diamond—37.7%
Humanity's Last Exam12.1%—
SimpleQA Verified—8.3%
Vectara Hallucination Rate7.8%—
BoolQ—88.7%
MMLU—81.8%

Multimodal Gemini 2.5 Flash leads

Gemini 2.5 Flash: 41.8 (#32), GPT-4o mini: 25.9 (#122)

BenchmarkGemini 2.5 FlashGPT-4o mini
LMArena Vision12531066
GeoBench76%64%
VPCT46.2%34%
Video-MME—64.8%
SpatialViz-Bench36.9%—

Multilingual Gemini 2.5 Flash leads

Gemini 2.5 Flash: 52.3 (#88), GPT-4o mini: 42.0 (#199)

BenchmarkGemini 2.5 FlashGPT-4o mini
LMArena Non-English14091266
LMArena Chinese14501265
LMArena French14331297
LMArena German14181272
LMArena Japanese14051216
LMArena Korean13851195
LMArena Russian14151275
LMArena Spanish14211276

Instruction Following Gemini 2.5 Flash leads

Gemini 2.5 Flash: 75.7 (#54), GPT-4o mini: 61.9 (#239)

BenchmarkGemini 2.5 FlashGPT-4o mini
IFEval89.8%78.2%
LMArena Instruction Following14051258
LiveBench Instruction Following—56.8%

Long Context Gemini 2.5 Flash leads

Gemini 2.5 Flash: 47.5 (#17), GPT-4o mini: 39.1 (#186)

BenchmarkGemini 2.5 FlashGPT-4o mini
LMArena Longer Query14191289
Fiction.LiveBench77.8%—

Writing & Preference Gemini 2.5 Flash leads

Gemini 2.5 Flash: 53.8 (#157), GPT-4o mini: 39.5 (#248)

BenchmarkGemini 2.5 FlashGPT-4o mini
LMArena Text14171286
LMArena Creative Writing14001268
Short-Story Creative Writing76.5%67.2%
EQ-Bench Creative Writing1137873
WildBench81.7%79.1%
LMArena Multi-Turn14081285
LiveBench Language—28.6%

Frequently asked questions

Is Gemini 2.5 Flash better than GPT-4o mini?

Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 25.5 on the Noometry Index. GPT-4o mini costs 3.2× less per token, which makes it the better buy when Gemini 2.5 Flash's lead doesn't matter for your workload.

Which is cheaper, Gemini 2.5 Flash or GPT-4o mini?

GPT-4o mini is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Gemini 2.5 Flash lists at $0.30 and $2.50.

Is Gemini 2.5 Flash or GPT-4o mini better for coding?

Gemini 2.5 Flash scores higher on coding benchmarks: 35.8 versus 22.0 in the Noometry coding category.

Which has the bigger context window?

Gemini 2.5 Flash does, with 1.05M tokens against 128K.

How many benchmarks do Gemini 2.5 Flash and GPT-4o mini share?

38 benchmarks have published results for both models. Gemini 2.5 Flash has 54 scored results on Noometry and GPT-4o mini has 60.

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