Noometry

Model comparison

Gemini 3.5 Flash Lite vs GPT-5.3 Chat

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.5 on the Noometry Index. Gemini 3.5 Flash Lite costs 5.7× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

Last verified . 18 shared benchmarks.

Gemini 3.5 Flash Lite Google

41.5

Rank #133 Confirmed

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Gemini 3.5 Flash Lite scores higher in 6 categories and GPT-5.3 Chat in 2 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 25.9.
  • Gemini 3.5 Flash Lite is cheaper at $0.30 / $2.50 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
  • Gemini 3.5 Flash Lite accepts more context: 1.05M tokens versus 128K.

Side by side

Gemini 3.5 Flash LiteGPT-5.3 Chat
ProviderGoogleOpenAI
Noometry Index41.542.8
Released2026-07-212026-03-03
WeightsProprietaryProprietary
Context window1.05M128K
Max output66K16K
Input $ / M tokens$0.30$1.75
Output $ / M tokens$2.50$14
Results tracked3918

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Category by category

Coding Too close to call

Gemini 3.5 Flash Lite: 42.4 (#104), GPT-5.3 Chat: 41.4 (#124)

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Coding14531408
LMArena WebDev1440—
SciCode41.3%—
WeirdML39%—
ALE-Bench765.27—

Agentic & Tool Use Not comparable

Gemini 3.5 Flash Lite: 25.7 (#107), GPT-5.3 Chat: —

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
APEX-Agents29.3%—
GDP.pdf10%—

Reasoning Too close to call

Gemini 3.5 Flash Lite: 27.8 (#114), GPT-5.3 Chat: 28.5 (#102)

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Hard Prompts14411399
ARC-AGI-210.3%—
NYT Connections (extended)60.4%—
ARC-AGI-153.5%—
CritPt0%—
Chess Puzzles22%—
Mystery Game Puzzles19%—
DTBench83.5%—
LMCA37.6%—
Epoch Capabilities Index145.13—

Math GPT-5.3 Chat leads

Gemini 3.5 Flash Lite: 25.9 (#264), GPT-5.3 Chat: 38.2 (#142)

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Math14331389
FrontierMath (Tiers 1-3)26%—
FrontierMath Tier 40%—
OTIS Mock AIME 2024-202571.1%—
ProofBench13%—

Knowledge Gemini 3.5 Flash Lite leads

Gemini 3.5 Flash Lite: 50.1 (#72), GPT-5.3 Chat: 38.8 (#140)

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Expert14351397
GPQA Diamond83.3%—

Multimodal Not comparable

Gemini 3.5 Flash Lite: 41.1 (#40), GPT-5.3 Chat: —

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Vision1268—

Multilingual Gemini 3.5 Flash Lite leads

Gemini 3.5 Flash Lite: 53.5 (#63), GPT-5.3 Chat: 50.3 (#124)

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Non-English14271382
LMArena Chinese14691432
LMArena French14511397
LMArena German14541384
LMArena Japanese14271352
LMArena Korean14071346
LMArena Russian14431400
LMArena Spanish14421371

Instruction Following Gemini 3.5 Flash Lite leads

Gemini 3.5 Flash Lite: 74.8 (#85), GPT-5.3 Chat: 72.8 (#129)

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Instruction Following14201378

Long Context Gemini 3.5 Flash Lite leads

Gemini 3.5 Flash Lite: 43.9 (#84), GPT-5.3 Chat: 42.6 (#120)

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Longer Query14351396

Writing & Preference Gemini 3.5 Flash Lite leads

Gemini 3.5 Flash Lite: 64.2 (#57), GPT-5.3 Chat: 63.1 (#68)

BenchmarkGemini 3.5 Flash LiteGPT-5.3 Chat
LMArena Text14351389
LMArena Creative Writing14201355
EQ-Bench Creative Writing15591690
LMArena Multi-Turn14451412

Frequently asked questions

Is Gemini 3.5 Flash Lite better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.5 on the Noometry Index. Gemini 3.5 Flash Lite costs 5.7× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

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

Gemini 3.5 Flash Lite is cheaper. It lists at $0.30 per million input tokens and $2.50 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

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

They score almost the same on coding (42.4 vs 41.4); test both on your own repository before choosing.

Which has the bigger context window?

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

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

18 benchmarks have published results for both models. Gemini 3.5 Flash Lite has 39 scored results on Noometry and GPT-5.3 Chat has 18.

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