Noometry

Model comparison

Gemini 3.8 Flash vs Gemini 3 Deep Think

Gemini 3.8 Flash has enough public results to be ranked (#11); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

Last verified . 3 shared benchmarks.

Gemini 3.8 Flash Google

61.8

Rank #11 Confirmed

Gemini 3 Deep Think Google

58.3

Unranked Sparse

Summary

  • They share 3 benchmarks with published results for both. Gemini 3.8 Flash scores higher in 1 category and Gemini 3 Deep Think 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 70.2.
  • The biggest single-benchmark swing is CritPt: 18.3% for Gemini 3.8 Flash and 25.7% for Gemini 3 Deep Think.

Side by side

Gemini 3.8 FlashGemini 3 Deep Think
ProviderGoogleGoogle
Noometry Index61.858.3
Released2026-09-022026-02-12
WeightsProprietaryProprietary
Context window1.05M—
Max output66K—
Input $ / M tokens$0.75—
Output $ / M tokens$3.75—
Results tracked503

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Not comparable

Gemini 3.8 Flash: 59.2 (#15), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
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), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
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), Gemini 3 Deep Think: 70.2 (#14)

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
ARC-AGI-289.2%84.6%
ARC-AGI-198.5%96%
CritPt18.3%25.7%
NYT Connections (extended)97.4%—
Chess Puzzles61%—
LMArena Hard Prompts1508—
Mystery Game Puzzles47%—
DTBench95.7%—
LMCA52.9%—
Surface Evolver Bench76.9%—
Epoch Capabilities Index156.71—

Math Not comparable

Gemini 3.8 Flash: 65.3 (#28), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
FrontierMath (Tiers 1-3)68.4%—
FrontierMath Tier 422%—
OTIS Mock AIME 2024-202598.9%—
ProofBench48%—
LMArena Math1528—

Knowledge Not comparable

Gemini 3.8 Flash: 74.8 (#2), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
GPQA Diamond95.4%—
Humanity's Last Exam44.5%—
SimpleQA Verified69.7%—
LMArena Expert1524—

Multimodal Not comparable

Gemini 3.8 Flash: 40.7 (#45), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
LMArena Vision1314—
Blueprint-Bench 238.6%—
Furniture Assembly31.7%—

Multilingual Not comparable

Gemini 3.8 Flash: 58.0 (#5), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
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), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
LMArena Instruction Following1490—

Long Context Not comparable

Gemini 3.8 Flash: 46.3 (#24), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
LMArena Longer Query1508—

Writing & Preference Not comparable

Gemini 3.8 Flash: 72.2 (#15), Gemini 3 Deep Think: —

BenchmarkGemini 3.8 FlashGemini 3 Deep Think
LMArena Text1499—
LMArena Creative Writing1492—
EQ-Bench Creative Writing1748—
LMArena Multi-Turn1501—

Frequently asked questions

Is Gemini 3.8 Flash better than Gemini 3 Deep Think?

Gemini 3.8 Flash has enough public results to be ranked (#11); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

How many benchmarks do Gemini 3.8 Flash and Gemini 3 Deep Think share?

3 benchmarks have published results for both models. Gemini 3.8 Flash has 50 scored results on Noometry and Gemini 3 Deep Think has 3.

Related comparisons

Go deeper