Noometry

Model comparison

Claude Sonnet 4 vs Llama 3.1-405B

Claude Sonnet 4 is the stronger model overall, scoring 40.8 to 30.7 on the Noometry Index.

Last verified . 35 shared benchmarks.

Claude Sonnet 4 Anthropic

40.8

Rank #145 Confirmed

Llama 3.1-405B Meta

30.7

Rank #288 Confirmed

Summary

  • They share 35 benchmarks with published results for both. Claude Sonnet 4 scores higher in 8 categories and Llama 3.1-405B in 1 category; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 4 leads 43.3 to 18.4.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 71.1% for Claude Sonnet 4 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 Sonnet 4Llama 3.1-405B
ProviderAnthropicMeta
Noometry Index40.830.7
Released2025-05-222024-07-23
WeightsProprietaryOpen
Context window200K—
Max output64K—
Input $ / M tokens$3—
Output $ / M tokens$15—
Results tracked5842

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Category by category

Coding Claude Sonnet 4 leads

Claude Sonnet 4: 43.5 (#88), Llama 3.1-405B: 33.1 (#262)

BenchmarkClaude Sonnet 4Llama 3.1-405B
WeirdML46.1%21.4%
LMArena Coding14141291
SWE-bench Verified (bash only)64.9%—
Aider Polyglot61.3%—
SciCode40%—
GSO4.9%—
ALE-Bench655.35—

Agentic & Tool Use Claude Sonnet 4 leads

Claude Sonnet 4: 38.5 (#31), Llama 3.1-405B: 21.0 (#140)

BenchmarkClaude Sonnet 4Llama 3.1-405B
TheAgentCompany33.1%7.4%
Cybench35%7.5%
DeepResearch Bench46.6%—
OSWorld43.9%—
METR Time Horizons62%—

Reasoning Claude Sonnet 4 leads

Claude Sonnet 4: 22.9 (#187), Llama 3.1-405B: 16.8 (#300)

BenchmarkClaude Sonnet 4Llama 3.1-405B
SimpleBench45.5%23%
Kagi LLM Benchmark73%45%
LMArena Hard Prompts13721269
DTBench77.1%61.4%
Epoch Capabilities Index141.69128.75
ForecastBench60.259.9
ARC-AGI-25.9%—
ARC-AGI-140%—
CritPt0.3%—
EnigmaEval3.1%—
LMCA29%—
BIG-Bench Hard—82.9%
HellaSwag—89.2%
PIQA—85.9%
WinoGrande—89.2%

Math Claude Sonnet 4 leads

Claude Sonnet 4: 43.3 (#80), Llama 3.1-405B: 18.4 (#290)

BenchmarkClaude Sonnet 4Llama 3.1-405B
OTIS Mock AIME 2024-202571.1%9.7%
Omni-MATH60.2%24.9%
LMArena Math13751281
MATH Level 584.4%49.8%
FrontierMath (Feb 2025 set)4.1%—
FrontierMath Tier 4 (v1)0%—

Knowledge Claude Sonnet 4 leads

Claude Sonnet 4: 41.8 (#108), Llama 3.1-405B: 30.4 (#227)

BenchmarkClaude Sonnet 4Llama 3.1-405B
GPQA Diamond79.2%50.9%
MMLU-Pro84.3%72.3%
Confabulations13.2%17.6%
GPQA (HELM)70.6%52.2%
LMArena Expert13721243
Humanity's Last Exam7.8%—
Vectara Hallucination Rate10.3%—
ARC (AI2) Challenge—95.3%
MMLU—84.5%
TriviaQA—82.7%

Multimodal Not comparable

Claude Sonnet 4: 26.2 (#121), Llama 3.1-405B: —

BenchmarkClaude Sonnet 4Llama 3.1-405B
LMArena Vision1191—
GeoBench37%—
VPCT34%—
MindCube44.8%—

Multilingual Claude Sonnet 4 leads

Claude Sonnet 4: 46.7 (#156), Llama 3.1-405B: 40.7 (#214)

BenchmarkClaude Sonnet 4Llama 3.1-405B
LMArena Non-English13331248
LMArena Chinese13501242
LMArena French13631279
LMArena German13311252
LMArena Japanese13021208
LMArena Korean12911184
LMArena Russian13551265
LMArena Spanish13571260

Instruction Following Claude Sonnet 4 leads

Claude Sonnet 4: 71.7 (#145), Llama 3.1-405B: 65.9 (#214)

BenchmarkClaude Sonnet 4Llama 3.1-405B
IFEval84%81.1%
LMArena Instruction Following13761259

Long Context Llama 3.1-405B leads

Claude Sonnet 4: 33.7 (#259), Llama 3.1-405B: 38.4 (#197)

BenchmarkClaude Sonnet 4Llama 3.1-405B
LMArena Longer Query13981266
Fiction.LiveBench46.9%—

Writing & Preference Claude Sonnet 4 leads

Claude Sonnet 4: 57.1 (#132), Llama 3.1-405B: 38.9 (#251)

BenchmarkClaude Sonnet 4Llama 3.1-405B
LMArena Text13511284
LMArena Creative Writing13451262
EQ-Bench Creative Writing1483870
WildBench83.8%78.3%
LMArena Multi-Turn13761297
Short-Story Creative Writing81.4%—

Frequently asked questions

Is Claude Sonnet 4 better than Llama 3.1-405B?

Claude Sonnet 4 is the stronger model overall, scoring 40.8 to 30.7 on the Noometry Index.

Is Claude Sonnet 4 or Llama 3.1-405B better for coding?

Claude Sonnet 4 scores higher on coding benchmarks: 43.5 versus 33.1 in the Noometry coding category.

How many benchmarks do Claude Sonnet 4 and Llama 3.1-405B share?

35 benchmarks have published results for both models. Claude Sonnet 4 has 58 scored results on Noometry and Llama 3.1-405B has 42.

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