Noometry

Model comparison

GPT-5.2 Codex vs Nemotron 3 Ultra

Nemotron 3 Ultra is the stronger model overall, scoring 44.7 to 42.2 on the Noometry Index.

Last verified . 0 shared benchmarks.

GPT-5.2 Codex OpenAI

42.2

Rank #107 Reported

Nemotron 3 Ultra NVIDIA

44.7

Rank #71 Confirmed

Summary

  • The widest gap is in coding, where GPT-5.2 Codex leads 45.4 to 37.7.
  • Nemotron 3 Ultra is cheaper at $0.60 / $2.40 per million input/output tokens, against $1.75 / $14 for GPT-5.2 Codex.
  • GPT-5.2 Codex accepts more context: 400K tokens versus 262K.
  • Nemotron 3 Ultra has downloadable open weights; the other is API-only.

Side by side

GPT-5.2 CodexNemotron 3 Ultra
ProviderOpenAINVIDIA
Noometry Index42.244.7
Released2025-12-182026-06-04
WeightsProprietaryOpen
Context window400K262K
Max output128K128K
Input $ / M tokens$1.75$0.60
Output $ / M tokens$14$2.40
Results tracked529

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

Category by category

Coding GPT-5.2 Codex leads

GPT-5.2 Codex: 45.4 (#66), Nemotron 3 Ultra: 37.7 (#174)

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
FrontierCode—13.6%
SWE-bench Verified (bash only)72.8%—
LMArena WebDev1339—
SWE-bench Multilingual66.3%—
SciCode—40.3%
WeirdML—43.5%
LMArena Coding—1468
ALE-Bench1,300—

Agentic & Tool Use Not comparable

GPT-5.2 Codex: 40.7 (#20), Nemotron 3 Ultra: —

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
Terminal-Bench66.5%—

Reasoning Not comparable

GPT-5.2 Codex: —, Nemotron 3 Ultra: 30.3 (#78)

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
CritPt—3.1%
Chess Puzzles—12%
LMArena Hard Prompts—1452
Mystery Game Puzzles—20%
DTBench—90.1%
LMCA—36.9%
Epoch Capabilities Index—146.2

Math Not comparable

GPT-5.2 Codex: —, Nemotron 3 Ultra: 34.4 (#160)

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
OTIS Mock AIME 2024-2025—86.7%
ProofBench—2%
LMArena Math—1456

Knowledge Not comparable

GPT-5.2 Codex: —, Nemotron 3 Ultra: 52.5 (#56)

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
GPQA Diamond—85.4%
LMArena Expert—1472

Multilingual Not comparable

GPT-5.2 Codex: —, Nemotron 3 Ultra: 53.7 (#61)

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
LMArena Non-English—1427
LMArena Chinese—1498
LMArena French—1475
LMArena German—1471
LMArena Korean—1387
LMArena Russian—1415
LMArena Spanish—1452

Instruction Following Not comparable

GPT-5.2 Codex: —, Nemotron 3 Ultra: 74.9 (#84)

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
LMArena Instruction Following—1417

Long Context Not comparable

GPT-5.2 Codex: —, Nemotron 3 Ultra: 43.9 (#77)

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
LMArena Longer Query—1437

Writing & Preference Not comparable

GPT-5.2 Codex: —, Nemotron 3 Ultra: 66.3 (#35)

BenchmarkGPT-5.2 CodexNemotron 3 Ultra
LMArena Text—1444
LMArena Creative Writing—1392
EQ-Bench Creative Writing—1692
LMArena Multi-Turn—1412

Frequently asked questions

Is GPT-5.2 Codex better than Nemotron 3 Ultra?

Nemotron 3 Ultra is the stronger model overall, scoring 44.7 to 42.2 on the Noometry Index.

Which is cheaper, GPT-5.2 Codex or Nemotron 3 Ultra?

Nemotron 3 Ultra is cheaper. It lists at $0.60 per million input tokens and $2.40 per million output tokens; GPT-5.2 Codex lists at $1.75 and $14.

Is GPT-5.2 Codex or Nemotron 3 Ultra better for coding?

GPT-5.2 Codex scores higher on coding benchmarks: 45.4 versus 37.7 in the Noometry coding category.

Which has the bigger context window?

GPT-5.2 Codex does, with 400K tokens against 262K.

How many benchmarks do GPT-5.2 Codex and Nemotron 3 Ultra share?

0 benchmarks have published results for both models. GPT-5.2 Codex has 5 scored results on Noometry and Nemotron 3 Ultra has 29.

Related comparisons

Go deeper