Noometry

Model comparison

Gemini 3.8 Flash vs GPT-5.2 Pro

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 52.3 on the Noometry Index.

Last verified . 6 shared benchmarks.

Gemini 3.8 Flash Google

61.8

Rank #11 Confirmed

GPT-5.2 Pro OpenAI

52.3

Rank #39 Reported

Summary

  • They share 6 benchmarks with published results for both. Gemini 3.8 Flash scores higher in 2 categories and GPT-5.2 Pro in 0 categories; one gap is clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.8 Flash leads 76.9 to 51.5.
  • The biggest single-benchmark swing is ARC-AGI-2: 89.2% for Gemini 3.8 Flash and 54.2% for GPT-5.2 Pro.
  • Gemini 3.8 Flash is cheaper at $0.75 / $3.75 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
  • Gemini 3.8 Flash accepts more context: 1.05M tokens versus 400K.

Side by side

Gemini 3.8 FlashGPT-5.2 Pro
ProviderGoogleOpenAI
Noometry Index61.852.3
Released2026-09-022025-12-11
WeightsProprietaryProprietary
Context window1.05M400K
Max output66K128K
Input $ / M tokens$0.75$21
Output $ / M tokens$3.75$168
Results tracked508

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Category by category

Coding Not comparable

Gemini 3.8 Flash: 59.2 (#15), GPT-5.2 Pro: —

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
DeepSWE73.8%—
FrontierCode41.2%—
CursorBench39.6%—
LMArena WebDev1584—
FrontierSWE19.6%—
SciCode56.6%—
WeirdML84.8%—
LMArena Coding1510—
ALE-Bench1,270—

Agentic & Tool Use Not comparable

Gemini 3.8 Flash: 41.8 (#21), GPT-5.2 Pro: —

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
APEX-Agents64.3%—
Remote Labor Index5.8%—
GDP.pdf23.4%—
Vending-Bench 25,094—

Reasoning Gemini 3.8 Flash leads

Gemini 3.8 Flash: 76.9 (#5), GPT-5.2 Pro: 51.5 (#33)

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
ARC-AGI-289.2%54.2%
NYT Connections (extended)97.4%79.3%
ARC-AGI-198.5%90.5%
Epoch Capabilities Index156.71155.4
SimpleBench—57.4%
CritPt18.3%—
Chess Puzzles61%—
LMArena Hard Prompts1508—
Mystery Game Puzzles47%—
DTBench95.7%—
LMCA52.9%—
Surface Evolver Bench76.9%—

Math Too close to call

Gemini 3.8 Flash: 65.3 (#28), GPT-5.2 Pro: 65.3 (#29)

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
FrontierMath (Tiers 1-3)68.4%74%
FrontierMath Tier 422%46%
OTIS Mock AIME 2024-202598.9%—
ProofBench48%—
LMArena Math1528—
FrontierMath Tier 4 (v1)—31.3%

Knowledge Not comparable

Gemini 3.8 Flash: 74.8 (#2), GPT-5.2 Pro: —

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
GPQA Diamond95.4%—
Humanity's Last Exam44.5%—
SimpleQA Verified69.7%—
LMArena Expert1524—

Multimodal Not comparable

Gemini 3.8 Flash: 40.7 (#45), GPT-5.2 Pro: —

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
LMArena Vision1314—
Blueprint-Bench 238.6%—
Furniture Assembly31.7%—

Multilingual Not comparable

Gemini 3.8 Flash: 58.0 (#5), GPT-5.2 Pro: —

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
LMArena Non-English1491—
LMArena Chinese1554—
LMArena French1498—
LMArena German1493—
LMArena Japanese1502—
LMArena Korean1459—
LMArena Russian1515—
LMArena Spanish1485—

Instruction Following Not comparable

Gemini 3.8 Flash: 78.0 (#13), GPT-5.2 Pro: —

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
LMArena Instruction Following1490—

Long Context Not comparable

Gemini 3.8 Flash: 46.3 (#24), GPT-5.2 Pro: —

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
LMArena Longer Query1508—

Writing & Preference Not comparable

Gemini 3.8 Flash: 72.2 (#15), GPT-5.2 Pro: —

BenchmarkGemini 3.8 FlashGPT-5.2 Pro
LMArena Text1499—
LMArena Creative Writing1492—
EQ-Bench Creative Writing1748—
LMArena Multi-Turn1501—

Frequently asked questions

Is Gemini 3.8 Flash better than GPT-5.2 Pro?

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 52.3 on the Noometry Index.

Which is cheaper, Gemini 3.8 Flash or GPT-5.2 Pro?

Gemini 3.8 Flash is cheaper. It lists at $0.75 per million input tokens and $3.75 per million output tokens; GPT-5.2 Pro lists at $21 and $168.

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-5.2 Pro share?

6 benchmarks have published results for both models. Gemini 3.8 Flash has 50 scored results on Noometry and GPT-5.2 Pro has 8.

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