Noometry

Model comparison

Claude Opus 4.1 vs Llama 3.1-405B

Claude Opus 4.1 is the stronger model overall, scoring 41.0 to 30.7 on the Noometry Index.

Last verified . 26 shared benchmarks.

Claude Opus 4.1 Anthropic

41.0

Rank #142 Confirmed

Llama 3.1-405B Meta

30.7

Rank #288 Confirmed

Summary

  • They share 26 benchmarks with published results for both. Claude Opus 4.1 scores higher in 9 categories and Llama 3.1-405B in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where Claude Opus 4.1 leads 62.4 to 38.9.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.9% for Claude Opus 4.1 and 9.7% for Llama 3.1-405B.
  • Llama 3.1-405B has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4.1Llama 3.1-405B
ProviderAnthropicMeta
Noometry Index41.030.7
Released2025-08-052024-07-23
WeightsProprietaryOpen
Context window200K—
Max output32K—
Input $ / M tokens$15—
Output $ / M tokens$75—
Results tracked4842

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Category by category

Coding Claude Opus 4.1 leads

Claude Opus 4.1: 44.4 (#73), Llama 3.1-405B: 33.1 (#262)

BenchmarkClaude Opus 4.1Llama 3.1-405B
WeirdML45.9%21.4%
LMArena Coding14791291
SWE-bench Verified73.3%—
LMArena WebDev1390—
ALE-Bench674.77—
AlgoTune1.34—

Agentic & Tool Use Claude Opus 4.1 leads

Claude Opus 4.1: 35.0 (#41), Llama 3.1-405B: 21.0 (#140)

BenchmarkClaude Opus 4.1Llama 3.1-405B
Cybench42%7.5%
Terminal-Bench38%—
GDPval43.6%—
TheAgentCompany—7.4%
DeepResearch Bench48.3%—
LMArena Search1148—
METR Time Horizons66.8%—

Reasoning Claude Opus 4.1 leads

Claude Opus 4.1: 32.2 (#76), Llama 3.1-405B: 16.8 (#300)

BenchmarkClaude Opus 4.1Llama 3.1-405B
SimpleBench60%23%
LMArena Hard Prompts14431269
DTBench80%61.4%
Epoch Capabilities Index144.12128.75
ForecastBench6259.9
Kagi LLM Benchmark—45%
Chess Puzzles7%—
EnigmaEval7.2%—
EBR-Bench7.9%—
Mystery Game Puzzles21%—
LMCA37.1%—
BIG-Bench Hard—82.9%
HellaSwag—89.2%
PIQA—85.9%
WinoGrande—89.2%

Math Claude Opus 4.1 leads

Claude Opus 4.1: 22.3 (#277), Llama 3.1-405B: 18.4 (#290)

BenchmarkClaude Opus 4.1Llama 3.1-405B
OTIS Mock AIME 2024-202568.9%9.7%
LMArena Math14311281
FrontierMath (Tiers 1-3)12.6%—
FrontierMath Tier 42.4%—
Omni-MATH—24.9%
MATH Level 5—49.8%
FrontierMath (Feb 2025 set)7.2%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.1 leads

Claude Opus 4.1: 42.0 (#101), Llama 3.1-405B: 30.4 (#227)

BenchmarkClaude Opus 4.1Llama 3.1-405B
GPQA Diamond77.3%50.9%
Confabulations17.1%17.6%
LMArena Expert14391243
Humanity's Last Exam11.5%—
MMLU-Pro—72.3%
Vectara Hallucination Rate11.8%—
GPQA (HELM)—52.2%
ARC (AI2) Challenge—95.3%
MMLU—84.5%
TriviaQA—82.7%

Multimodal Not comparable

Claude Opus 4.1: 26.8 (#119), Llama 3.1-405B: —

BenchmarkClaude Opus 4.1Llama 3.1-405B
VPCT35%—

Multilingual Claude Opus 4.1 leads

Claude Opus 4.1: 52.0 (#95), Llama 3.1-405B: 40.7 (#214)

BenchmarkClaude Opus 4.1Llama 3.1-405B
LMArena Non-English14051248
LMArena Chinese14271242
LMArena French14311279
LMArena German14131252
LMArena Japanese13781208
LMArena Korean13801184
LMArena Russian14221265
LMArena Spanish14481260

Instruction Following Claude Opus 4.1 leads

Claude Opus 4.1: 75.6 (#58), Llama 3.1-405B: 65.9 (#214)

BenchmarkClaude Opus 4.1Llama 3.1-405B
LMArena Instruction Following14351259
IFEval—81.1%

Long Context Claude Opus 4.1 leads

Claude Opus 4.1: 44.5 (#63), Llama 3.1-405B: 38.4 (#197)

BenchmarkClaude Opus 4.1Llama 3.1-405B
LMArena Longer Query14551266

Writing & Preference Claude Opus 4.1 leads

Claude Opus 4.1: 62.4 (#74), Llama 3.1-405B: 38.9 (#251)

BenchmarkClaude Opus 4.1Llama 3.1-405B
LMArena Text14191284
LMArena Creative Writing14121262
LMArena Multi-Turn14441297
Short-Story Creative Writing84.7%—
EQ-Bench Creative Writing—870
WildBench—78.3%

Frequently asked questions

Is Claude Opus 4.1 better than Llama 3.1-405B?

Claude Opus 4.1 is the stronger model overall, scoring 41.0 to 30.7 on the Noometry Index.

Is Claude Opus 4.1 or Llama 3.1-405B better for coding?

Claude Opus 4.1 scores higher on coding benchmarks: 44.4 versus 33.1 in the Noometry coding category.

How many benchmarks do Claude Opus 4.1 and Llama 3.1-405B share?

26 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Llama 3.1-405B has 42.

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