Noometry

Model comparison

Gemini 3.5 Flash vs Gemini 3 Deep Think

Gemini 3.5 Flash has enough public results to be ranked (#32); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

Last verified . 3 shared benchmarks.

Gemini 3.5 Flash Google

54.2

Rank #32 Confirmed

Gemini 3 Deep Think Google

58.3

Unranked Sparse

Summary

  • They share 3 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 0 categories and Gemini 3 Deep Think in 1 category; one gap is clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3 Deep Think leads 70.2 to 62.8.
  • The biggest single-benchmark swing is CritPt: 13.1% for Gemini 3.5 Flash and 25.7% for Gemini 3 Deep Think.

Side by side

Gemini 3.5 FlashGemini 3 Deep Think
ProviderGoogleGoogle
Noometry Index54.258.3
Released2026-05-192026-02-12
WeightsProprietaryProprietary
Context window1.05M—
Max output66K—
Input $ / M tokens$1.50—
Output $ / M tokens$9—
Results tracked543

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

Category by category

Coding Not comparable

Gemini 3.5 Flash: 49.4 (#49), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
SWE-bench Verified79.3%—
DeepSWE37.4%—
LMArena WebDev1499—
SciCode53.1%—
WeirdML62.6%—
LMArena Coding1492—
ALE-Bench911.02—

Agentic & Tool Use Not comparable

Gemini 3.5 Flash: 24.7 (#114), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
APEX-Agents27.5%—
GBAEval6.7%—
GDP.pdf14%—
Vending-Bench 25,396—

Reasoning Gemini 3 Deep Think leads

Gemini 3.5 Flash: 62.8 (#18), Gemini 3 Deep Think: 70.2 (#14)

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
ARC-AGI-272.1%84.6%
ARC-AGI-192.5%96%
CritPt13.1%25.7%
SimpleBench76.7%—
NYT Connections (extended)92.6%—
Chess Puzzles50%—
EnigmaEval25.4%—
EBR-Bench4.8%—
LMArena Hard Prompts1488—
Mystery Game Puzzles32%—
DTBench94.7%—
LMCA47.1%—
Surface Evolver Bench58.1%—
Epoch Capabilities Index154.46—
ForecastBench59—

Math Not comparable

Gemini 3.5 Flash: 60.7 (#36), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
FrontierMath (Tiers 1-3)62.8%—
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions76.3%—
OTIS Mock AIME 2024-202595.6%—
ProofBench31%—
LMArena Math1504—
FrontierMath (Feb 2025 set)39%—
FrontierMath Tier 4 (v1)14.6%—

Knowledge Not comparable

Gemini 3.5 Flash: 66.3 (#11), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
GPQA Diamond92.8%—
SimpleQA Verified66.2%—
LMArena Expert1495—

Multimodal Not comparable

Gemini 3.5 Flash: 45.7 (#15), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
LMArena Vision1310—
Blueprint-Bench 233.6%—
LMArena Document1463—

Multilingual Not comparable

Gemini 3.5 Flash: 57.0 (#13), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
LMArena Non-English1476—
LMArena Chinese1526—
LMArena French1490—
LMArena German1492—
LMArena Japanese1486—
LMArena Korean1451—
LMArena Russian1493—
LMArena Spanish1480—

Instruction Following Not comparable

Gemini 3.5 Flash: 77.0 (#30), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
LMArena Instruction Following1467—

Long Context Not comparable

Gemini 3.5 Flash: 45.4 (#38), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
LMArena Longer Query1482—

Writing & Preference Not comparable

Gemini 3.5 Flash: 65.5 (#47), Gemini 3 Deep Think: —

BenchmarkGemini 3.5 FlashGemini 3 Deep Think
LMArena Text1482—
LMArena Creative Writing1470—
EQ-Bench 41087—
LMArena Multi-Turn1481—

Frequently asked questions

Is Gemini 3.5 Flash better than Gemini 3 Deep Think?

Gemini 3.5 Flash has enough public results to be ranked (#32); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

How many benchmarks do Gemini 3.5 Flash and Gemini 3 Deep Think share?

3 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and Gemini 3 Deep Think has 3.

Related comparisons

Go deeper