Model comparison

Gemma 3 27B vs GPT-5.3 Chat

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 30.5 on the Noometry Index. Gemma 3 27B costs 48× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

Last verified October 10, 2026. 18 shared benchmarks.

Gemma 3 27B

Google

30.5

Rank #277 Confirmed

GPT-5.3 Chat OpenAI

42.1

Rank #109 Confirmed

Summary

They share 18 benchmarks with published results for both. Gemma 3 27B scores higher in 0 categories and GPT-5.3 Chat in 8 categories; 8 gaps are clear of the uncertainty.
The widest gap is in coding, where GPT-5.3 Chat leads 40.8 to 22.1.
Gemma 3 27B is cheaper at $0.08 / $0.16 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
Gemma 3 27B accepts more context: 131K tokens versus 128K.
Gemma 3 27B has downloadable open weights; the other is API-only.

Side by side

Gemma 3 27B and GPT-5.3 Chat specifications
	Gemma 3 27B	GPT-5.3 Chat
Provider	Google	OpenAI
Noometry Index	30.5	42.1
Released	2025-03-11	2026-03-03
Weights	Open	Proprietary
Context window	131K	128K
Max output	8K	16K
Input $ / M tokens	$0.08	$1.75
Output $ / M tokens	$0.16	$14
Results tracked	43	18

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

Category by category

Coding GPT-5.3 Chat leads

Gemma 3 27B: 22.1 (#329), GPT-5.3 Chat: 40.8 (#124)

Coding benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Coding	1322	1408
Aider Polyglot	4.9%	—
SciCode	21.2%	—
LiveBench Coding	39.9%	—

Agentic & Tool Use Not comparable

Gemma 3 27B: 24.9 (#105), GPT-5.3 Chat: —

Agentic & Tool Use benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
Berkeley Function Calling Leaderboard	29.5%	—

Reasoning GPT-5.3 Chat leads

Gemma 3 27B: 16.3 (#297), GPT-5.3 Chat: 27.3 (#105)

Reasoning benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Hard Prompts	1340	1399
Kagi LLM Benchmark	40.4%	—
CritPt	0%	—
Chess Puzzles	0%	—
LiveBench Reasoning	43.8%	—
DTBench	52.5%	—
LiveBench Data Analysis	51.5%	—
LMCA	12.3%	—
Epoch Capabilities Index	130.04	—
LiveBench	50%	—

Math GPT-5.3 Chat leads

Gemma 3 27B: 24.4 (#261), GPT-5.3 Chat: 35.4 (#146)

Math benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Math	1312	1389
OTIS Mock AIME 2024-2025	22.5%	—
LiveBench Math	55.4%	—
MATH Level 5	74%	—

Knowledge GPT-5.3 Chat leads

Gemma 3 27B: 25.4 (#256), GPT-5.3 Chat: 38.2 (#137)

Knowledge benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Expert	1303	1397
GPQA Diamond	47.7%	—
Confabulations	40.3%	—
Vectara Hallucination Rate	7.4%	—

Multimodal Not comparable

Gemma 3 27B: 32.0 (#94), GPT-5.3 Chat: —

Multimodal benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Vision	1165	—
GeoBench	52%	—

Multilingual GPT-5.3 Chat leads

Gemma 3 27B: 47.0 (#150), GPT-5.3 Chat: 50.5 (#119)

Multilingual benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Non-English	1334	1383
LMArena Chinese	1347	1433
LMArena French	1368	1398
LMArena German	1362	1384
LMArena Japanese	1287	1351
LMArena Korean	1308	1347
LMArena Russian	1349	1400
LMArena Spanish	1348	1371

Instruction Following GPT-5.3 Chat leads

Gemma 3 27B: 70.8 (#155), GPT-5.3 Chat: 73.0 (#124)

Instruction Following benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Instruction Following	1321	1378
LiveBench Instruction Following	74.9%	—

Long Context GPT-5.3 Chat leads

Gemma 3 27B: 27.6 (#288), GPT-5.3 Chat: 42.6 (#115)

Long Context benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Longer Query	1333	1396
Fiction.LiveBench	33.3%	—

Writing & Preference GPT-5.3 Chat leads

Gemma 3 27B: 52.7 (#161), GPT-5.3 Chat: 63.3 (#65)

Writing & Preference benchmarks
Benchmark	Gemma 3 27B	GPT-5.3 Chat
LMArena Text	1358	1389
LMArena Creative Writing	1346	1356
EQ-Bench Creative Writing	1266	1690
LMArena Multi-Turn	1344	1413
Short-Story Creative Writing	79.9%	—
LiveBench Language	34.6%	—

Frequently asked questions

Is Gemma 3 27B better than GPT-5.3 Chat?

Which is cheaper, Gemma 3 27B or GPT-5.3 Chat?

Gemma 3 27B is cheaper. It lists at $0.08 per million input tokens and $0.16 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

Is Gemma 3 27B or GPT-5.3 Chat better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 40.8 versus 22.1 in the Noometry coding category.

Which has the bigger context window?

Gemma 3 27B does, with 131K tokens against 128K.

How many benchmarks do Gemma 3 27B and GPT-5.3 Chat share?

18 benchmarks have published results for both models. Gemma 3 27B has 43 scored results on Noometry and GPT-5.3 Chat has 18.