Model comparison

GPT-5.3 Chat vs Nova 2 Lite

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 39.0 on the Noometry Index. Nova 2 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 October 10, 2026. 17 shared benchmarks.

GPT-5.3 Chat OpenAI

42.1

Rank #109 Confirmed

Nova 2 Lite Amazon

39.0

Rank #161 Confirmed

Summary

They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 7 categories and Nova 2 Lite in 1 category; 5 gaps are clear of the uncertainty.
The widest gap is in writing & preference, where GPT-5.3 Chat leads 63.3 to 54.1.
Nova 2 Lite is cheaper at $0.30 / $2.50 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
Nova 2 Lite accepts more context: 1M tokens versus 128K.

Side by side

GPT-5.3 Chat and Nova 2 Lite specifications
	GPT-5.3 Chat	Nova 2 Lite
Provider	OpenAI	Amazon
Noometry Index	42.1	39.0
Released	2026-03-03	2025-12-01
Weights	Proprietary	Proprietary
Context window	128K	1M
Max output	16K	64K
Input $ / M tokens	$1.75	$0.30
Output $ / M tokens	$14	$2.50
Results tracked	18	19

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Category by category

Coding Too close to call

GPT-5.3 Chat: 40.8 (#124), Nova 2 Lite: 40.1 (#131)

Coding benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
LMArena Coding	1408	1386

Agentic & Tool Use Not comparable

GPT-5.3 Chat: —, Nova 2 Lite: 23.9 (#114)

Agentic & Tool Use benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
Berkeley Function Calling Leaderboard	—	27.1%

Reasoning Too close to call

GPT-5.3 Chat: 27.3 (#105), Nova 2 Lite: 26.4 (#120)

Reasoning benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
LMArena Hard Prompts	1399	1364

Math Too close to call

GPT-5.3 Chat: 35.4 (#146), Nova 2 Lite: 34.8 (#154)

Math benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
LMArena Math	1389	1359

Knowledge Nova 2 Lite leads

GPT-5.3 Chat: 38.2 (#137), Nova 2 Lite: 42.5 (#88)

Knowledge benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
LMArena Expert	1397	1360
Vectara Hallucination Rate	—	5.1%

Multilingual GPT-5.3 Chat leads

GPT-5.3 Chat: 50.5 (#119), Nova 2 Lite: 47.3 (#148)

Multilingual benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
LMArena Non-English	1383	1337
LMArena Chinese	1433	1364
LMArena French	1398	1381
LMArena German	1384	1343
LMArena Japanese	1351	1273
LMArena Korean	1347	1284
LMArena Russian	1400	1343
LMArena Spanish	1371	1372

Instruction Following GPT-5.3 Chat leads

GPT-5.3 Chat: 73.0 (#124), Nova 2 Lite: 70.7 (#156)

Instruction Following benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
LMArena Instruction Following	1378	1335

Long Context GPT-5.3 Chat leads

GPT-5.3 Chat: 42.6 (#115), Nova 2 Lite: 40.6 (#145)

Long Context benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
LMArena Longer Query	1396	1335

Writing & Preference GPT-5.3 Chat leads

GPT-5.3 Chat: 63.3 (#65), Nova 2 Lite: 54.1 (#150)

Writing & Preference benchmarks
Benchmark	GPT-5.3 Chat	Nova 2 Lite
LMArena Text	1389	1362
LMArena Creative Writing	1356	1291
LMArena Multi-Turn	1413	1338
EQ-Bench Creative Writing	1690	—

Frequently asked questions

Is GPT-5.3 Chat better than Nova 2 Lite?

Which is cheaper, GPT-5.3 Chat or Nova 2 Lite?

Nova 2 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 GPT-5.3 Chat or Nova 2 Lite better for coding?

They score almost the same on coding (40.8 vs 40.1); test both on your own repository before choosing.

Which has the bigger context window?

Nova 2 Lite does, with 1M tokens against 128K.

How many benchmarks do GPT-5.3 Chat and Nova 2 Lite share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Nova 2 Lite has 19.