Noometry

Model comparison

Gemini 3.8 Flash vs GPT-5 Mini

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 41.8 on the Noometry Index. GPT-5 Mini costs 2.2× less per token, which makes it the better buy when Gemini 3.8 Flash's lead doesn't matter for your workload.

Last verified . 38 shared benchmarks.

Gemini 3.8 Flash Google

61.8

Rank #11 Confirmed

GPT-5 Mini OpenAI

41.8

Rank #128 Confirmed

Summary

  • They share 38 benchmarks with published results for both. Gemini 3.8 Flash scores higher in 10 categories and GPT-5 Mini in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.8 Flash leads 76.9 to 23.9.
  • The biggest single-benchmark swing is ARC-AGI-2: 89.2% for Gemini 3.8 Flash and 4.4% for GPT-5 Mini.
  • GPT-5 Mini is cheaper at $0.25 / $2 per million input/output tokens, against $0.75 / $3.75 for Gemini 3.8 Flash.
  • Gemini 3.8 Flash accepts more context: 1.05M tokens versus 400K.

Side by side

Gemini 3.8 FlashGPT-5 Mini
ProviderGoogleOpenAI
Noometry Index61.841.8
Released2026-09-022025-08-07
WeightsProprietaryProprietary
Context window1.05M400K
Max output66K128K
Input $ / M tokens$0.75$0.25
Output $ / M tokens$3.75$2
Results tracked5060

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Category by category

Coding Gemini 3.8 Flash leads

Gemini 3.8 Flash: 59.2 (#15), GPT-5 Mini: 40.1 (#146)

BenchmarkGemini 3.8 FlashGPT-5 Mini
SciCode56.6%39.2%
WeirdML84.8%52.7%
LMArena Coding15101406
ALE-Bench1,270799.77
SWE-bench Verified—64.7%
DeepSWE73.8%—
FrontierCode41.2%—
SWE-bench Verified (bash only)—59.8%
CursorBench39.6%—
LMArena WebDev1584—
SWE-bench Multilingual—39.7%
FrontierSWE19.6%—
AlgoTune—1.38

Agentic & Tool Use Gemini 3.8 Flash leads

Gemini 3.8 Flash: 41.8 (#21), GPT-5 Mini: 31.1 (#70)

BenchmarkGemini 3.8 FlashGPT-5 Mini
Vending-Bench 25,094-31.18
Terminal-Bench—34.8%
APEX-Agents64.3%—
Berkeley Function Calling Leaderboard—55.5%
Remote Labor Index5.8%—
GDP.pdf23.4%—

Reasoning Gemini 3.8 Flash leads

Gemini 3.8 Flash: 76.9 (#5), GPT-5 Mini: 23.9 (#168)

BenchmarkGemini 3.8 FlashGPT-5 Mini
ARC-AGI-289.2%4.4%
ARC-AGI-198.5%54.3%
CritPt18.3%0%
Chess Puzzles61%30%
LMArena Hard Prompts15081380
Mystery Game Puzzles47%10%
DTBench95.7%80.5%
LMCA52.9%34.2%
Epoch Capabilities Index156.71145.52
Kagi LLM Benchmark—70.3%
NYT Connections (extended)97.4%—
EnigmaEval—8.2%
Surface Evolver Bench76.9%—
ForecastBench—61

Math Gemini 3.8 Flash leads

Gemini 3.8 Flash: 65.3 (#28), GPT-5 Mini: 46.7 (#69)

BenchmarkGemini 3.8 FlashGPT-5 Mini
FrontierMath (Tiers 1-3)68.4%46.7%
FrontierMath Tier 422%12.2%
OTIS Mock AIME 2024-202598.9%86.7%
ProofBench48%9%
LMArena Math15281378
Omni-MATH—72.2%
MATH Level 5—97.8%
FrontierMath (Feb 2025 set)—27.2%
FrontierMath Tier 4 (v1)—6.3%

Knowledge Gemini 3.8 Flash leads

Gemini 3.8 Flash: 74.8 (#2), GPT-5 Mini: 45.6 (#86)

BenchmarkGemini 3.8 FlashGPT-5 Mini
GPQA Diamond95.4%75%
Humanity's Last Exam44.5%19.4%
SimpleQA Verified69.7%21.6%
LMArena Expert15241379
MMLU-Pro—83.5%
Confabulations—13.3%
Vectara Hallucination Rate—12.9%
GPQA (HELM)—75.6%

Multimodal Gemini 3.8 Flash leads

Gemini 3.8 Flash: 40.7 (#45), GPT-5 Mini: 35.6 (#85)

BenchmarkGemini 3.8 FlashGPT-5 Mini
LMArena Vision13141202
VPCT—40.2%
Blueprint-Bench 238.6%—
Furniture Assembly31.7%—

Multilingual Gemini 3.8 Flash leads

Gemini 3.8 Flash: 58.0 (#5), GPT-5 Mini: 48.9 (#137)

BenchmarkGemini 3.8 FlashGPT-5 Mini
LMArena Non-English14911363
LMArena Chinese15541385
LMArena French14981386
LMArena German14931366
LMArena Japanese15021341
LMArena Korean14591308
LMArena Russian15151362
LMArena Spanish14851355

Instruction Following Gemini 3.8 Flash leads

Gemini 3.8 Flash: 78.0 (#13), GPT-5 Mini: 76.2 (#46)

BenchmarkGemini 3.8 FlashGPT-5 Mini
LMArena Instruction Following14901357
IFEval—92.7%

Long Context Gemini 3.8 Flash leads

Gemini 3.8 Flash: 46.3 (#24), GPT-5 Mini: 41.9 (#132)

BenchmarkGemini 3.8 FlashGPT-5 Mini
LMArena Longer Query15081355
Fiction.LiveBench—69.4%

Writing & Preference Gemini 3.8 Flash leads

Gemini 3.8 Flash: 72.2 (#15), GPT-5 Mini: 55.2 (#148)

BenchmarkGemini 3.8 FlashGPT-5 Mini
LMArena Text14991373
LMArena Creative Writing14921325
EQ-Bench Creative Writing17481313
LMArena Multi-Turn15011363
Short-Story Creative Writing—83.1%
WildBench—85.5%

Frequently asked questions

Is Gemini 3.8 Flash better than GPT-5 Mini?

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 41.8 on the Noometry Index. GPT-5 Mini costs 2.2× less per token, which makes it the better buy when Gemini 3.8 Flash's lead doesn't matter for your workload.

Which is cheaper, Gemini 3.8 Flash or GPT-5 Mini?

GPT-5 Mini is cheaper. It lists at $0.25 per million input tokens and $2 per million output tokens; Gemini 3.8 Flash lists at $0.75 and $3.75.

Is Gemini 3.8 Flash or GPT-5 Mini better for coding?

Gemini 3.8 Flash scores higher on coding benchmarks: 59.2 versus 40.1 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.8 Flash does, with 1.05M tokens against 400K.

How many benchmarks do Gemini 3.8 Flash and GPT-5 Mini share?

38 benchmarks have published results for both models. Gemini 3.8 Flash has 50 scored results on Noometry and GPT-5 Mini has 60.

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