Noometry

Model comparison

Claude Opus 5.5 vs Command A

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 36.5 on the Noometry Index. Command A costs 1.8× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 17 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Command A Cohere

36.5

Rank #215 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and Command A in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 18.3.
  • The biggest single-benchmark swing is LMCA: 68.2% for Claude Opus 5.5 and 10.3% for Command A.
  • Command A is cheaper at $2.50 / $10 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 256K.
  • Command A has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Command A
ProviderAnthropicCohere
Noometry Index68.636.5
Released2026-09-222025-03-13
WeightsProprietaryOpen
Context window1M256K
Max output128K8K
Input $ / M tokens$4$2.50
Output $ / M tokens$20$10
Results tracked4424

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Command A: 27.2 (#322)

BenchmarkClaude Opus 5.5Command A
LMArena Coding15471330
FrontierCode54.6%—
Aider Polyglot—12%
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), Command A: 35.9 (#40)

BenchmarkClaude Opus 5.5Command A
APEX-Agents73.5%—
Berkeley Function Calling Leaderboard—57.1%
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Command A: 18.3 (#283)

BenchmarkClaude Opus 5.5Command A
LMArena Hard Prompts15351326
DTBench98.9%61.3%
LMCA68.2%10.3%
ARC-AGI-293.3%—
Kagi LLM Benchmark—28.8%
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Command A: 36.2 (#171)

BenchmarkClaude Opus 5.5Command A
LMArena Math15061300
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Command A: 37.1 (#159)

BenchmarkClaude Opus 5.5Command A
LMArena Expert15471295
GPQA Diamond90.6%—
SimpleQA Verified72.2%—
Vectara Hallucination Rate—9.3%

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Command A: —

BenchmarkClaude Opus 5.5Command A
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Command A: 45.3 (#170)

BenchmarkClaude Opus 5.5Command A
LMArena Non-English15071313
LMArena Chinese15881327
LMArena French15141351
LMArena Russian15201314
LMArena Spanish15071347
LMArena German—1341
LMArena Japanese—1285
LMArena Korean—1285

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Command A: 69.1 (#177)

BenchmarkClaude Opus 5.5Command A
LMArena Instruction Following15371309

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Command A: 40.6 (#151)

BenchmarkClaude Opus 5.5Command A
LMArena Longer Query15321334

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Command A: 47.6 (#208)

BenchmarkClaude Opus 5.5Command A
LMArena Text15151331
LMArena Creative Writing15331319
EQ-Bench Creative Writing20501145
LMArena Multi-Turn14991339

Frequently asked questions

Is Claude Opus 5.5 better than Command A?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 36.5 on the Noometry Index. Command A costs 1.8× 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 Command A?

Command A is cheaper. It lists at $2.50 per million input tokens and $10 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Command A better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 27.2 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 256K.

How many benchmarks do Claude Opus 5.5 and Command A share?

17 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Command A has 24.

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