Model comparison

GPT-5.3 Chat vs Laguna M.1

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 32.5 on the Noometry Index.

Last verified October 10, 2026. 0 shared benchmarks.

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

Laguna M.1

Poolside

32.5

Rank #256 Reported

Summary

The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 21.1.
Laguna M.1 accepts more context: 262K tokens versus 128K.
Laguna M.1 has downloadable open weights; the other is API-only.

Side by side

GPT-5.3 Chat and Laguna M.1 specifications
	GPT-5.3 Chat	Laguna M.1
Provider	OpenAI	Poolside
Noometry Index	42.8	32.5
Released	2026-03-03	2026-04-28
Weights	Proprietary	Open
Context window	128K	262K
Max output	16K	33K
Input $ / M tokens	$1.75	—
Output $ / M tokens	$14	—
Results tracked	18	3

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Category by category

Coding GPT-5.3 Chat leads

GPT-5.3 Chat: 41.4 (#124), Laguna M.1: 36.6 (#204)

Coding benchmarks
Benchmark	GPT-5.3 Chat	Laguna M.1
LMArena WebDev	—	1349
LMArena Coding	1408	—

Reasoning GPT-5.3 Chat leads

GPT-5.3 Chat: 28.5 (#102), Laguna M.1: 23.1 (#184)

Reasoning benchmarks
Benchmark	GPT-5.3 Chat	Laguna M.1
LMArena Hard Prompts	1399	—
Surface Evolver Bench	—	15.6%

Math GPT-5.3 Chat leads

GPT-5.3 Chat: 38.2 (#142), Laguna M.1: 21.1 (#283)

Math benchmarks
Benchmark	GPT-5.3 Chat	Laguna M.1
ProofBench	—	0%
LMArena Math	1389	—

Knowledge Not comparable

GPT-5.3 Chat: 38.8 (#140), Laguna M.1: —

Knowledge benchmarks
Benchmark	GPT-5.3 Chat	Laguna M.1
LMArena Expert	1397	—

Multilingual Not comparable

GPT-5.3 Chat: 50.3 (#124), Laguna M.1: —

Multilingual benchmarks
Benchmark	GPT-5.3 Chat	Laguna M.1
LMArena Non-English	1382	—
LMArena Chinese	1432	—
LMArena French	1397	—
LMArena German	1384	—
LMArena Japanese	1352	—
LMArena Korean	1346	—
LMArena Russian	1400	—
LMArena Spanish	1371	—

Instruction Following Not comparable

GPT-5.3 Chat: 72.8 (#129), Laguna M.1: —

Instruction Following benchmarks
Benchmark	GPT-5.3 Chat	Laguna M.1
LMArena Instruction Following	1378	—

Long Context Not comparable

GPT-5.3 Chat: 42.6 (#120), Laguna M.1: —

Long Context benchmarks
Benchmark	GPT-5.3 Chat	Laguna M.1
LMArena Longer Query	1396	—

Writing & Preference Not comparable

GPT-5.3 Chat: 63.1 (#68), Laguna M.1: —

Writing & Preference benchmarks
Benchmark	GPT-5.3 Chat	Laguna M.1
LMArena Text	1389	—
LMArena Creative Writing	1355	—
EQ-Bench Creative Writing	1690	—
LMArena Multi-Turn	1412	—

Frequently asked questions

Is GPT-5.3 Chat better than Laguna M.1?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 32.5 on the Noometry Index.

Is GPT-5.3 Chat or Laguna M.1 better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 36.6 in the Noometry coding category.

Which has the bigger context window?

Laguna M.1 does, with 262K tokens against 128K.

How many benchmarks do GPT-5.3 Chat and Laguna M.1 share?

0 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Laguna M.1 has 3.