Noometry

Model comparison

Claude Opus 5.5 vs Llama 4 Scout

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 27.4 on the Noometry Index. Llama 4 Scout costs 53× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 20 shared benchmarks.

Claude Opus 5.5 Anthropic

68.5

Rank #3 Confirmed

Llama 4 Scout Meta

27.4

Rank #323 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Claude Opus 5.5 scores higher in 10 categories and Llama 4 Scout in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 18.4.
  • The biggest single-benchmark swing is ARC-AGI-1: 97.5% for Claude Opus 5.5 and 0.5% for Llama 4 Scout.
  • Llama 4 Scout is cheaper at $0.10 / $0.30 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 128K.
  • Llama 4 Scout has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Llama 4 Scout
ProviderAnthropicMeta
Noometry Index68.527.4
Released2026-09-222025-04-05
WeightsProprietaryOpen
Context window1M128K
Max output128K4K
Input $ / M tokens$4$0.10
Output $ / M tokens$20$0.30
Results tracked3543

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), Llama 4 Scout: 19.9 (#334)

BenchmarkClaude Opus 5.5Llama 4 Scout
SciCode66.9%17%
LMArena Coding15451286
FrontierCode54.4%—
SWE-bench Verified (bash only)—9.1%
CursorBench57.8%—
LMArena WebDev1820—
FrontierSWE62.3%—
MirrorCode77.4%—
BigCodeBench Complete—43.1%

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#13), Llama 4 Scout: 24.4 (#109)

BenchmarkClaude Opus 5.5Llama 4 Scout
APEX-Agents73.5%—
Berkeley Function Calling Leaderboard—28.1%
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), Llama 4 Scout: 9.2 (#339)

BenchmarkClaude Opus 5.5Llama 4 Scout
ARC-AGI-292.5%0%
ARC-AGI-197.5%0.5%
CritPt31.7%0%
LMArena Hard Prompts15451266
DTBench98.9%57.9%
LMCA68.2%12%
Kagi LLM Benchmark—36.9%
NYT Connections (extended)88.5%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
Epoch Capabilities Index—129.64
ForecastBench—57.5

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), Llama 4 Scout: 18.4 (#280)

BenchmarkClaude Opus 5.5Llama 4 Scout
OTIS Mock AIME 2024-2025100%7.8%
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
ProofBench100%—
Omni-MATH—37.3%
LMArena Math—1286
MATH Level 5—62.3%
FrontierMath (Feb 2025 set)—0%

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.6 (#9), Llama 4 Scout: 31.8 (#208)

BenchmarkClaude Opus 5.5Llama 4 Scout
GPQA Diamond90.6%51.8%
LMArena Expert15641236
SimpleQA Verified72.2%—
MMLU-Pro—74.2%
Vectara Hallucination Rate—7.7%
GPQA (HELM)—50.7%

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 56.5 (#2), Llama 4 Scout: 31.6 (#98)

BenchmarkClaude Opus 5.5Llama 4 Scout
LMArena Vision—1118
Furniture Assembly83.3%—
SpatialViz-Bench—34.2%

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.8 (#1), Llama 4 Scout: 41.3 (#207)

BenchmarkClaude Opus 5.5Llama 4 Scout
LMArena Non-English15131253
LMArena Chinese15721256
LMArena Russian15321263
LMArena French—1283
LMArena German—1274
LMArena Japanese—1209
LMArena Korean—1207
LMArena Spanish—1277

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.1 (#2), Llama 4 Scout: 66.0 (#212)

BenchmarkClaude Opus 5.5Llama 4 Scout
LMArena Instruction Following15351248
IFEval—81.8%

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.3 (#18), Llama 4 Scout: 27.5 (#289)

BenchmarkClaude Opus 5.5Llama 4 Scout
LMArena Longer Query15401265
Fiction.LiveBench—36%

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.7 (#3), Llama 4 Scout: 37.1 (#256)

BenchmarkClaude Opus 5.5Llama 4 Scout
LMArena Text15181279
LMArena Creative Writing15381249
EQ-Bench Creative Writing2050783
LMArena Multi-Turn15201281
WildBench—78%

Frequently asked questions

Is Claude Opus 5.5 better than Llama 4 Scout?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 27.4 on the Noometry Index. Llama 4 Scout costs 53× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or Llama 4 Scout?

Llama 4 Scout is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Llama 4 Scout better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 19.9 in the Noometry coding category.

Which has the bigger context window?

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

How many benchmarks do Claude Opus 5.5 and Llama 4 Scout share?

20 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Llama 4 Scout has 43.

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