Noometry

Model comparison

Claude Opus 4.5 vs Nemotron 3 Ultra

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 42.5 on the Noometry Index. Nemotron 3 Ultra costs 9.5× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Last verified . 26 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #47 Confirmed

Nemotron 3 Ultra NVIDIA

42.5

Rank #113 Confirmed

Summary

  • They share 26 benchmarks with published results for both. Claude Opus 4.5 scores higher in 9 categories and Nemotron 3 Ultra in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in agentic & tool use, where Claude Opus 4.5 leads 47.3 to 23.4.
  • The biggest single-benchmark swing is ProofBench: 36% for Claude Opus 4.5 and 2% for Nemotron 3 Ultra.
  • Nemotron 3 Ultra is cheaper at $0.60 / $2.40 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
  • Nemotron 3 Ultra accepts more context: 262K tokens versus 200K.
  • Nemotron 3 Ultra has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4.5Nemotron 3 Ultra
ProviderAnthropicNVIDIA
Noometry Index50.542.5
Released2025-11-012026-06-04
WeightsProprietaryOpen
Context window200K262K
Max output64K128K
Input $ / M tokens$5$0.60
Output $ / M tokens$25$2.40
Results tracked6930

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Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 54.8 (#27), Nemotron 3 Ultra: 38.1 (#182)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
WeirdML63.7%43.5%
LMArena Coding15041468
SWE-bench Verified76.7%—
FrontierCode—13.6%
SWE-bench Verified (bash only)76.8%—
LMArena WebDev1494—
SWE-bench Multilingual70.7%—
SciCode—40.3%
GSO26.5%—
ALE-Bench1,025—
AlgoTune1.77—

Agentic & Tool Use Claude Opus 4.5 leads

Claude Opus 4.5: 47.3 (#12), Nemotron 3 Ultra: 23.4 (#126)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
Terminal-Bench63.1%—
APEX-Agents—22.7%
Berkeley Function Calling Leaderboard77.5%—
GDPval45.5%—
Remote Labor Index3.8%—
τ²-bench Airline84%—
τ²-bench Banking24.7%—
τ²-bench Retail79.6%—
τ²-bench Telecom92.3%—
Cybench82%—
DeepResearch Bench54.8%—
OSWorld66.3%—
BALROG43.5%—
LMArena Search1180—
METR Time Horizons75%—
Vending-Bench 24,967—

Reasoning Claude Opus 4.5 leads

Claude Opus 4.5: 42.6 (#51), Nemotron 3 Ultra: 31.0 (#82)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
Chess Puzzles12%12%
LMArena Hard Prompts14761452
Mystery Game Puzzles22%20%
DTBench89.9%90.1%
LMCA44.5%36.9%
Epoch Capabilities Index150.09146.17
ARC-AGI-237.6%—
SimpleBench62%—
Kagi LLM Benchmark80.2%—
NYT Connections (extended)52.5%—
ARC-AGI-180%—
CritPt—3.1%
EnigmaEval11.9%—
EBR-Bench14.3%—
ForecastBench60.7—

Math Claude Opus 4.5 leads

Claude Opus 4.5: 38.6 (#132), Nemotron 3 Ultra: 35.3 (#187)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
OTIS Mock AIME 2024-202586.1%86.7%
ProofBench36%2%
LMArena Math14631457
FrontierMath (Tiers 1-3)34.4%—
FrontierMath Tier 44.9%—
FrontierMath (Feb 2025 set)20.7%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.5 leads

Claude Opus 4.5: 56.5 (#44), Nemotron 3 Ultra: 52.5 (#61)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
GPQA Diamond86%85.4%
LMArena Expert14871472
Humanity's Last Exam25.2%—
SimpleQA Verified45.7%—
Vectara Hallucination Rate10.9%—

Multimodal Not comparable

Claude Opus 4.5: 31.4 (#107), Nemotron 3 Ultra: —

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
GeoBench75%—
VPCT40%—
Furniture Assembly28.3%—
LMArena Document1462—

Multilingual Too close to call

Claude Opus 4.5: 54.3 (#47), Nemotron 3 Ultra: 53.5 (#64)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
LMArena Non-English14381427
LMArena Chinese14701497
LMArena French14711472
LMArena German14491471
LMArena Korean14241386
LMArena Russian14471417
LMArena Spanish14581454
LMArena Japanese1416—

Instruction Following Claude Opus 4.5 leads

Claude Opus 4.5: 77.5 (#19), Nemotron 3 Ultra: 74.7 (#88)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
LMArena Instruction Following14781418

Long Context Claude Opus 4.5 leads

Claude Opus 4.5: 46.5 (#22), Nemotron 3 Ultra: 43.9 (#81)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
LMArena Longer Query14801437
CL-bench21.1%—

Writing & Preference Claude Opus 4.5 leads

Claude Opus 4.5: 68.1 (#28), Nemotron 3 Ultra: 66.3 (#36)

BenchmarkClaude Opus 4.5Nemotron 3 Ultra
LMArena Text14511445
LMArena Creative Writing14451398
EQ-Bench Creative Writing16871692
LMArena Multi-Turn14661411

Frequently asked questions

Is Claude Opus 4.5 better than Nemotron 3 Ultra?

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 42.5 on the Noometry Index. Nemotron 3 Ultra costs 9.5× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 4.5 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; Claude Opus 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or Nemotron 3 Ultra better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 38.1 in the Noometry coding category.

Which has the bigger context window?

Nemotron 3 Ultra does, with 262K tokens against 200K.

How many benchmarks do Claude Opus 4.5 and Nemotron 3 Ultra share?

26 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Nemotron 3 Ultra has 30.

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