Noometry

Model comparison

GPT-5.3 Chat vs Nemotron 3.5 Lightning

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 40.0 on the Noometry Index. Nemotron 3.5 Lightning costs 55× 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.

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

Nemotron 3.5 Lightning NVIDIA

40.0

Rank #155 Confirmed

Summary

  • They share 18 benchmarks with published results for both. GPT-5.3 Chat scores higher in 8 categories and Nemotron 3.5 Lightning in 0 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where GPT-5.3 Chat leads 63.1 to 48.5.
  • Nemotron 3.5 Lightning is cheaper at $0.05 / $0.20 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
  • Nemotron 3.5 Lightning accepts more context: 262K tokens versus 128K.
  • Nemotron 3.5 Lightning has downloadable open weights; the other is API-only.

Side by side

GPT-5.3 ChatNemotron 3.5 Lightning
ProviderOpenAINVIDIA
Noometry Index42.840.0
Released2026-03-032026-08-11
WeightsProprietaryOpen
Context window128K262K
Max output16K262K
Input $ / M tokens$1.75$0.05
Output $ / M tokens$14$0.20
Results tracked1818

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Category by category

Coding GPT-5.3 Chat leads

GPT-5.3 Chat: 41.4 (#124), Nemotron 3.5 Lightning: 40.4 (#141)

BenchmarkGPT-5.3 ChatNemotron 3.5 Lightning
LMArena Coding14081375

Reasoning GPT-5.3 Chat leads

GPT-5.3 Chat: 28.5 (#102), Nemotron 3.5 Lightning: 26.8 (#127)

BenchmarkGPT-5.3 ChatNemotron 3.5 Lightning
LMArena Hard Prompts13991337

Math Too close to call

GPT-5.3 Chat: 38.2 (#142), Nemotron 3.5 Lightning: 37.5 (#155)

BenchmarkGPT-5.3 ChatNemotron 3.5 Lightning
LMArena Math13891359

Knowledge GPT-5.3 Chat leads

GPT-5.3 Chat: 38.8 (#140), Nemotron 3.5 Lightning: 37.5 (#154)

BenchmarkGPT-5.3 ChatNemotron 3.5 Lightning
LMArena Expert13971356

Multilingual GPT-5.3 Chat leads

GPT-5.3 Chat: 50.3 (#124), Nemotron 3.5 Lightning: 44.0 (#180)

BenchmarkGPT-5.3 ChatNemotron 3.5 Lightning
LMArena Non-English13821295
LMArena Chinese14321359
LMArena French13971366
LMArena German13841282
LMArena Japanese13521206
LMArena Korean13461238
LMArena Russian14001253
LMArena Spanish13711345

Instruction Following GPT-5.3 Chat leads

GPT-5.3 Chat: 72.8 (#129), Nemotron 3.5 Lightning: 69.6 (#170)

BenchmarkGPT-5.3 ChatNemotron 3.5 Lightning
LMArena Instruction Following13781318

Long Context GPT-5.3 Chat leads

GPT-5.3 Chat: 42.6 (#120), Nemotron 3.5 Lightning: 39.9 (#165)

BenchmarkGPT-5.3 ChatNemotron 3.5 Lightning
LMArena Longer Query13961314

Writing & Preference GPT-5.3 Chat leads

GPT-5.3 Chat: 63.1 (#68), Nemotron 3.5 Lightning: 48.5 (#201)

BenchmarkGPT-5.3 ChatNemotron 3.5 Lightning
LMArena Text13891327
LMArena Creative Writing13551254
EQ-Bench Creative Writing16901280
LMArena Multi-Turn14121328

Frequently asked questions

Is GPT-5.3 Chat better than Nemotron 3.5 Lightning?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 40.0 on the Noometry Index. Nemotron 3.5 Lightning costs 55× 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, GPT-5.3 Chat or Nemotron 3.5 Lightning?

Nemotron 3.5 Lightning is cheaper. It lists at $0.05 per million input tokens and $0.20 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

Is GPT-5.3 Chat or Nemotron 3.5 Lightning better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 40.4 in the Noometry coding category.

Which has the bigger context window?

Nemotron 3.5 Lightning does, with 262K tokens against 128K.

How many benchmarks do GPT-5.3 Chat and Nemotron 3.5 Lightning share?

18 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Nemotron 3.5 Lightning has 18.

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