Noometry

Model comparison

Claude Sonnet 5.5 vs Llama 3.1-70B

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 29.6 on the Noometry Index. Llama 3.1-70B costs 10× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

Last verified . 15 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Llama 3.1-70B Meta

29.6

Rank #308 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 9 categories and Llama 3.1-70B in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 13.5.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 3.6% for Llama 3.1-70B.
  • Llama 3.1-70B is cheaper at $0.40 / $0.40 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
  • Claude Sonnet 5.5 accepts more context: 1M tokens versus 128K.
  • Llama 3.1-70B has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5.5Llama 3.1-70B
ProviderAnthropicMeta
Noometry Index61.929.6
Released2026-09-282024-07-23
WeightsProprietaryOpen
Context window1M128K
Max output128K4K
Input $ / M tokens$2$0.40
Output $ / M tokens$10$0.40
Results tracked3235

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Llama 3.1-70B: 30.3 (#296)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
LMArena Coding15131260
FrontierCode52.1%—
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
SciCode61%—
WeirdML—9%
BigCodeBench Instruct—46.1%
BigCodeBench Complete—54.8%
ALE-Bench1,819—

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.0 (#16), Llama 3.1-70B: 25.1 (#112)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
APEX-Agents75.5%—
TheAgentCompany—6.9%
BALROG—27.9%

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Llama 3.1-70B: 21.6 (#220)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
LMArena Hard Prompts14951241
Epoch Capabilities Index165.03125.92
NYT Connections (extended)80.5%—
CritPt31.4%—
Mystery Game Puzzles65%—
DTBench—60%
LMCA—14.8%

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), Llama 3.1-70B: 13.5 (#304)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
OTIS Mock AIME 2024-2025100%3.6%
LMArena Math15101252
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
ProofBench100%—
Omni-MATH—21%
MATH Level 5—36.7%
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), Llama 3.1-70B: 24.2 (#269)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
GPQA Diamond95.6%44.2%
LMArena Expert15401209
SimpleQA Verified46.5%—
MMLU-Pro—65.3%
GPQA (HELM)—42.6%
MMLU—80.1%

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), Llama 3.1-70B: —

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 55.3 (#30), Llama 3.1-70B: 38.8 (#225)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
LMArena Non-English14521219
LMArena Chinese15221215
LMArena Russian14511234
LMArena French—1261
LMArena German—1222
LMArena Japanese—1132
LMArena Korean—1140
LMArena Spanish—1253

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), Llama 3.1-70B: 65.3 (#223)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
LMArena Instruction Following14951231
IFEval—82.1%

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), Llama 3.1-70B: 37.6 (#214)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
LMArena Longer Query14981241

Writing & Preference Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#40), Llama 3.1-70B: 35.4 (#267)

BenchmarkClaude Sonnet 5.5Llama 3.1-70B
LMArena Text14711261
LMArena Creative Writing14651232
LMArena Multi-Turn14741256
EQ-Bench Creative Writing—784
WildBench—75.8%

Frequently asked questions

Is Claude Sonnet 5.5 better than Llama 3.1-70B?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 29.6 on the Noometry Index. Llama 3.1-70B costs 10× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 5.5 or Llama 3.1-70B?

Llama 3.1-70B is cheaper. It lists at $0.40 per million input tokens and $0.40 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

Is Claude Sonnet 5.5 or Llama 3.1-70B better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 30.3 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 128K.

How many benchmarks do Claude Sonnet 5.5 and Llama 3.1-70B share?

15 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Llama 3.1-70B has 35.

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