Model comparison

Gemma 3 4B vs GPT-5 Pro

GPT-5 Pro is the stronger model overall, scoring 46.4 to 28.1 on the Noometry Index. Gemma 3 4B costs 825× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.

Last verified October 11, 2026. 2 shared benchmarks.

Gemma 3 4B

Google

28.1

Rank #326 Confirmed

GPT-5 Pro OpenAI

46.4

Rank #64 Confirmed

Summary

They share 2 benchmarks with published results for both. Gemma 3 4B scores higher in 0 categories and GPT-5 Pro in 4 categories; 4 gaps are clear of the uncertainty.
The widest gap is in knowledge, where GPT-5 Pro leads 56.7 to 11.8.
The biggest single-benchmark swing is Kagi LLM Benchmark: 25.2% for Gemma 3 4B and 76.8% for GPT-5 Pro.
Gemma 3 4B is cheaper at $0.04 / $0.08 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
GPT-5 Pro accepts more context: 400K tokens versus 131K.
Gemma 3 4B has downloadable open weights; the other is API-only.

Side by side

Gemma 3 4B and GPT-5 Pro specifications
	Gemma 3 4B	GPT-5 Pro
Provider	Google	OpenAI
Noometry Index	28.1	46.4
Released	2025-03-12	2025-10-06
Weights	Open	Proprietary
Context window	131K	400K
Max output	4K	272K
Input $ / M tokens	$0.04	$15
Output $ / M tokens	$0.08	$120
Results tracked	22	12

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Category by category

Coding GPT-5 Pro leads

Gemma 3 4B: 35.9 (#215), GPT-5 Pro: 44.0 (#80)

Coding benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
WeirdML	—	60.4%
LMArena Coding	1230	—
AlgoTune	—	1.31

Agentic & Tool Use Not comparable

Gemma 3 4B: 20.9 (#142), GPT-5 Pro: —

Agentic & Tool Use benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
Berkeley Function Calling Leaderboard	19.6%	—

Reasoning GPT-5 Pro leads

Gemma 3 4B: 13.2 (#335), GPT-5 Pro: 38.9 (#62)

Reasoning benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
Kagi LLM Benchmark	25.2%	76.8%
Epoch Capabilities Index	116.02	150.28
ARC-AGI-2	—	18.3%
SimpleBench	—	61.6%
ARC-AGI-1	—	70.2%
Chess Puzzles	0%	—
EnigmaEval	—	18.8%
LMArena Hard Prompts	1253	—
DTBench	50.9%	—
LMCA	2.8%	—

Math GPT-5 Pro leads

Gemma 3 4B: 16.8 (#292), GPT-5 Pro: 48.5 (#63)

Math benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
FrontierMath (Tiers 1-3)	—	55.8%
FrontierMath Tier 4	—	19.5%
OTIS Mock AIME 2024-2025	7.5%	—
LMArena Math	1239	—
FrontierMath Tier 4 (v1)	—	14.6%

Knowledge GPT-5 Pro leads

Gemma 3 4B: 11.8 (#299), GPT-5 Pro: 56.7 (#42)

Knowledge benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
GPQA Diamond	23.2%	—
Humanity's Last Exam	—	31.6%
Vectara Hallucination Rate	6.4%	—
LMArena Expert	1223	—

Multilingual Not comparable

Gemma 3 4B: 42.5 (#194), GPT-5 Pro: —

Multilingual benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
LMArena Non-English	1273	—
LMArena German	1281	—
LMArena Russian	1294	—

Instruction Following Not comparable

Gemma 3 4B: 65.2 (#225), GPT-5 Pro: —

Instruction Following benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
LMArena Instruction Following	1239	—

Long Context Not comparable

Gemma 3 4B: 38.7 (#194), GPT-5 Pro: —

Long Context benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
LMArena Longer Query	1273	—

Writing & Preference Not comparable

Gemma 3 4B: 42.0 (#239), GPT-5 Pro: —

Writing & Preference benchmarks
Benchmark	Gemma 3 4B	GPT-5 Pro
LMArena Text	1291	—
LMArena Creative Writing	1271	—
EQ-Bench Creative Writing	1068	—
LMArena Multi-Turn	1255	—

Frequently asked questions

Is Gemma 3 4B better than GPT-5 Pro?

Which is cheaper, Gemma 3 4B or GPT-5 Pro?

Gemma 3 4B is cheaper. It lists at $0.04 per million input tokens and $0.08 per million output tokens; GPT-5 Pro lists at $15 and $120.

Is Gemma 3 4B or GPT-5 Pro better for coding?

GPT-5 Pro scores higher on coding benchmarks: 44.0 versus 35.9 in the Noometry coding category.

Which has the bigger context window?

GPT-5 Pro does, with 400K tokens against 131K.

How many benchmarks do Gemma 3 4B and GPT-5 Pro share?

2 benchmarks have published results for both models. Gemma 3 4B has 22 scored results on Noometry and GPT-5 Pro has 12.