Noometry

Model comparison

Gemini 3.5 Flash vs GPT-5.3 Chat

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 42.8 on the Noometry Index.

Last verified . 17 shared benchmarks.

Gemini 3.5 Flash Google

54.2

Rank #32 Confirmed

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 8 categories and GPT-5.3 Chat in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.5 Flash leads 62.8 to 28.5.
  • Gemini 3.5 Flash is cheaper at $1.50 / $9 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
  • Gemini 3.5 Flash accepts more context: 1.05M tokens versus 128K.

Side by side

Gemini 3.5 FlashGPT-5.3 Chat
ProviderGoogleOpenAI
Noometry Index54.242.8
Released2026-05-192026-03-03
WeightsProprietaryProprietary
Context window1.05M128K
Max output66K16K
Input $ / M tokens$1.50$1.75
Output $ / M tokens$9$14
Results tracked5418

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Category by category

Coding Gemini 3.5 Flash leads

Gemini 3.5 Flash: 49.4 (#49), GPT-5.3 Chat: 41.4 (#124)

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Coding14921408
SWE-bench Verified79.3%—
DeepSWE37.4%—
LMArena WebDev1499—
SciCode53.1%—
WeirdML62.6%—
ALE-Bench911.02—

Agentic & Tool Use Not comparable

Gemini 3.5 Flash: 24.7 (#114), GPT-5.3 Chat: —

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
APEX-Agents27.5%—
GBAEval6.7%—
GDP.pdf14%—
Vending-Bench 25,396—

Reasoning Gemini 3.5 Flash leads

Gemini 3.5 Flash: 62.8 (#18), GPT-5.3 Chat: 28.5 (#102)

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Hard Prompts14881399
ARC-AGI-272.1%—
SimpleBench76.7%—
NYT Connections (extended)92.6%—
ARC-AGI-192.5%—
CritPt13.1%—
Chess Puzzles50%—
EnigmaEval25.4%—
EBR-Bench4.8%—
Mystery Game Puzzles32%—
DTBench94.7%—
LMCA47.1%—
Surface Evolver Bench58.1%—
Epoch Capabilities Index154.46—
ForecastBench59—

Math Gemini 3.5 Flash leads

Gemini 3.5 Flash: 60.7 (#36), GPT-5.3 Chat: 38.2 (#142)

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Math15041389
FrontierMath (Tiers 1-3)62.8%—
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions76.3%—
OTIS Mock AIME 2024-202595.6%—
ProofBench31%—
FrontierMath (Feb 2025 set)39%—
FrontierMath Tier 4 (v1)14.6%—

Knowledge Gemini 3.5 Flash leads

Gemini 3.5 Flash: 66.3 (#11), GPT-5.3 Chat: 38.8 (#140)

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Expert14951397
GPQA Diamond92.8%—
SimpleQA Verified66.2%—

Multimodal Not comparable

Gemini 3.5 Flash: 45.7 (#15), GPT-5.3 Chat: —

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Vision1310—
Blueprint-Bench 233.6%—
LMArena Document1463—

Multilingual Gemini 3.5 Flash leads

Gemini 3.5 Flash: 57.0 (#13), GPT-5.3 Chat: 50.3 (#124)

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Non-English14761382
LMArena Chinese15261432
LMArena French14901397
LMArena German14921384
LMArena Japanese14861352
LMArena Korean14511346
LMArena Russian14931400
LMArena Spanish14801371

Instruction Following Gemini 3.5 Flash leads

Gemini 3.5 Flash: 77.0 (#30), GPT-5.3 Chat: 72.8 (#129)

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Instruction Following14671378

Long Context Gemini 3.5 Flash leads

Gemini 3.5 Flash: 45.4 (#38), GPT-5.3 Chat: 42.6 (#120)

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Longer Query14821396

Writing & Preference Gemini 3.5 Flash leads

Gemini 3.5 Flash: 65.5 (#47), GPT-5.3 Chat: 63.1 (#68)

BenchmarkGemini 3.5 FlashGPT-5.3 Chat
LMArena Text14821389
LMArena Creative Writing14701355
LMArena Multi-Turn14811412
EQ-Bench Creative Writing—1690
EQ-Bench 41087—

Frequently asked questions

Is Gemini 3.5 Flash better than GPT-5.3 Chat?

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 42.8 on the Noometry Index.

Which is cheaper, Gemini 3.5 Flash or GPT-5.3 Chat?

Gemini 3.5 Flash is cheaper. It lists at $1.50 per million input tokens and $9 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

Is Gemini 3.5 Flash or GPT-5.3 Chat better for coding?

Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 41.4 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.5 Flash does, with 1.05M tokens against 128K.

How many benchmarks do Gemini 3.5 Flash and GPT-5.3 Chat share?

17 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and GPT-5.3 Chat has 18.

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