Claude Opus 5.5 vs Command A
Updated October 21, 2026. 35 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
vs boards won of 35 shared
Decision reading
Only Claude Opus 5.5 has a coding score, 88.8 on the Vibe Coding Index; Command A has none, so the two cannot be ranked on coding.
Command A has the edge where output tokens cost 2.0x less.
Model AClaude Opus 5.5Anthropic88.8/1005 independent benchmarksNo cost per solved taskModel BCommand ACohereNot benchmarked1 independent benchmark$2.69 per solved task
- Shared results
- 35
- Claude Opus 5.5 only
- 72
- Command A only
- 25
- Like-for-like categories
- 7 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Only Claude Opus 5.5 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Claude Opus 5.5
Claude Opus 5.5 leads, 57.6 against 13.1.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Command A has a AA Agentic Index result, 1.0.
Directional only
Reasoning
GPQA Diamond
No call
Only Command A has a GPQA Diamond result, 48.5%.
Directional only
Math
AIME
No call
Only Command A has a AIME result, 13.3%.
Directional only
Knowledge
MMLU Pro
No call
Only Command A has a MMLU Pro result, 69.2%.
Directional only
Web design
Design Arena: websites
No call
Only Claude Opus 5.5 has a Design Arena: websites result, 1336.
Directional only
General
Vals Index
No call
Only Claude Opus 5.5 has a Vals Index result, 70.2%.
Directional only
Long documents
Listed context window
Claude Opus 5.5
Claude Opus 5.5 takes 1M tokens against 256K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Command A
Claude Opus 5.5 $0.014, Command A $0.0075 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Command A has the number, $2.69.
Directional only
At a glance
- Coding index
- Claude Opus 5.5 88.8 from 5 benchmarks, Command A not benchmarked.
- Widest category
- Agentic work, 49.6 points apart on average over 1 shared benchmark.
- Widest single gap
- Terminal-Bench 2.1 (Vals AI): Claude Opus 5.5 87.6% against Command A 17.6%, 70.0 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 5.5 $20.00 against Command A $10.00 per million output tokens, 2.0x apart.
- Context window
- Claude Opus 5.5 takes 1M tokens, Command A 256K.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Claude Opus 5.5 | Bars | Command A | Ties |
|---|---|---|---|---|
| Coding | 4 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 1 | 0 | ||
| Reasoning | 4 | 0 | ||
| Math | 2 | 0 | ||
| Knowledge | 5 | 0 | ||
| General | 18 | 0 | ||
| All shared boards | 35 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index40
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| LiveBench coding | 96.3% | Not measured | Only Claude Opus 5.5 measured |
| LMArena WebDev | 1807 | Not measured | Only Claude Opus 5.5 measured |
| AA Coding Index | Not measured | 27.8 | Only Command A measured |
| LiveCodeBench (Vals AI) | Not measured | 35.1% | Only Command A measured |
| SWE-bench Verified (Vals AI) | Not measured | 7.8% | Only Command A measured |
| Terminal-Bench 4 (Vals AI) | 65.2% | Not measured | Only Claude Opus 5.5 measured |
| Vibe Code Bench (Vals AI) | 90.3% | Not measured | Only Claude Opus 5.5 measured |
| Code migration (Vals AI) | 66.7% | Not measured | Only Claude Opus 5.5 measured |
| ProgramBench (Vals AI) | 18.5% | Not measured | Only Claude Opus 5.5 measured |
| IOI (Vals AI) | 95.1% | Not measured | Only Claude Opus 5.5 measured |
| Terminal-Bench 2.1 (Vals AI) | 87.6% | 17.6% | Claude Opus 5.5 |
| SWE-bench Multimodal (Vals AI) | 70.2% | Not measured | Only Claude Opus 5.5 measured |
| Vibe Code Bench 1-100 (Vals AI) | 30.4% | Not measured | Only Claude Opus 5.5 measured |
| CyberBench (Vals AI) | 74.6% | Not measured | Only Claude Opus 5.5 measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 28.7% | Only Command A measured |
| SciCode | 66.9% | 38.5% | Claude Opus 5.5 |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 25.0% | Only Command A measured |
| FrontierCode | 54.6% | Not measured | Only Claude Opus 5.5 measured |
| FrontierSWE | 62.3% | Not measured | Only Claude Opus 5.5 measured |
| MirrorCode | 77.4% | Not measured | Only Claude Opus 5.5 measured |
| ALE-Bench | 2147.4 | Not measured | Only Claude Opus 5.5 measured |
| LMArena Text: coding | 1545 | 1330 | Claude Opus 5.5 |
| LMArena Text: software and IT | 1538 | 1336 | Claude Opus 5.5 |
| LMArena WebDev: React | 1855 | Not measured | Only Claude Opus 5.5 measured |
| LMArena WebDev: HTML | 1753 | Not measured | Only Claude Opus 5.5 measured |
| LMArena WebDev: from an image | 1753 | Not measured | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 12 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| AA Intelligence Index | 57.6 | 13.1 | Claude Opus 5.5 |
| Epoch Capabilities Index | 168.8 | Not measured | Only Claude Opus 5.5 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 1.0 | Only Command A measured |
| Design Arena: agents building web apps | 1317 | Not measured | Only Claude Opus 5.5 measured |
| Design Arena: agents building mobile apps | 1312 | Not measured | Only Claude Opus 5.5 measured |
| Design Arena: spreadsheets | 1356 | Not measured | Only Claude Opus 5.5 measured |
| LiveBench research | 85.0% | Not measured | Only Claude Opus 5.5 measured |
| LiveBench browser | 80.0% | Not measured | Only Claude Opus 5.5 measured |
| LiveBench long agentic | 85.0% | Not measured | Only Claude Opus 5.5 measured |
| SREBench (Vals AI) | 33.6% | Not measured | Only Claude Opus 5.5 measured |
| Finance Agent (Vals AI) | 58.6% | 9.0% | Claude Opus 5.5 |
| Tax Agent Bench (Vals AI) | 45.6% | Not measured | Only Claude Opus 5.5 measured |
| Legal Research Bench (Vals AI) | 50.5% | Not measured | Only Claude Opus 5.5 measured |
| Harvey's Legal Agent Benchmark (Vals AI) | 9.2% | Not measured | Only Claude Opus 5.5 measured |
| Excel Modeling Benchmark (Vals AI) | 75.9% | Not measured | Only Claude Opus 5.5 measured |
| BioMysteryBench (Vals AI) | 79.3% | Not measured | Only Claude Opus 5.5 measured |
| Terminal-Bench-Science (Vals AI) | 47.1% | Not measured | Only Claude Opus 5.5 measured |
| Vals Science Index | 58.7% | Not measured | Only Claude Opus 5.5 measured |
| Time Horizon Index (Vals AI) | 91.3% | Not measured | Only Claude Opus 5.5 measured |
| CUA-bench (Vals AI) | 14.0% | Not measured | Only Claude Opus 5.5 measured |
| Robo-bench (Vals AI) | 14.6% | Not measured | Only Claude Opus 5.5 measured |
| τ²-Bench Telecom | Not measured | 80.7% | Only Command A measured |
| APEX-Agents | 73.5% | Not measured | Only Claude Opus 5.5 measured |
| Remote Labor Index | 21.3% | Not measured | Only Claude Opus 5.5 measured |
| SpireClimb | 3.3% | Not measured | Only Claude Opus 5.5 measured |
| Vending-Bench 2 | $9,235 | Not measured | Only Claude Opus 5.5 measured |
| LMArena Search | 1213 | Not measured | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 14 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 48.5% | Only Command A measured |
| LiveBench reasoning | 92.2% | Not measured | Only Claude Opus 5.5 measured |
| MysteryMechanism (Vals AI) | 49.5% | Not measured | Only Claude Opus 5.5 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 76.1% | Only Command A measured |
| Humanity's Last Exam (Artificial Analysis run) | 61.4% | 12.0% | Claude Opus 5.5 |
| GPQA Diamond (Epoch AI run) | 90.6% | Not measured | Only Claude Opus 5.5 measured |
| ARC-AGI | 98.5% | Not measured | Only Claude Opus 5.5 measured |
| ARC-AGI-2 | 93.3% | Not measured | Only Claude Opus 5.5 measured |
| Chess puzzles | 67.0% | Not measured | Only Claude Opus 5.5 measured |
| Mystery game puzzles | 71.0% | Not measured | Only Claude Opus 5.5 measured |
| EBR-bench | 71.4% | Not measured | Only Claude Opus 5.5 measured |
| LMArena Text: hard prompts | 1536 | 1326 | Claude Opus 5.5 |
| LMArena Text: expert | 1549 | 1296 | Claude Opus 5.5 |
| LMArena Text: hard prompts in English | 1535 | 1335 | Claude Opus 5.5 |
| LMArena Vision: diagrams | 1345 | Not measured | Only Claude Opus 5.5 measured |
| LMArena Vision: homework | 1362 | Not measured | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| AIME | Not measured | 13.3% | Only Command A measured |
| MATH 500 (Vals AI) | Not measured | 76.2% | Only Command A measured |
| MGSM (Vals AI) | Not measured | 85.7% | Only Command A measured |
| AA Math Index | Not measured | 13.0 | Only Command A measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 13.0% | Only Command A measured |
| OTIS Mock AIME | 100.0% | Not measured | Only Claude Opus 5.5 measured |
| FrontierMath, tiers 1 to 3 | 91.2% | Not measured | Only Claude Opus 5.5 measured |
| FrontierMath, tier 4 | 95.0% | Not measured | Only Claude Opus 5.5 measured |
| ProofBench | 100.0% | Not measured | Only Claude Opus 5.5 measured |
| LMArena Text: math | 1518 | 1300 | Claude Opus 5.5 |
| LMArena Text: mathematical work | 1516 | 1312 | Claude Opus 5.5 |
| Neither model has a result on the other 2 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 69.2% | Only Command A measured |
| LegalBench (Vals AI) | Not measured | 79.7% | Only Command A measured |
| CaseLaw (Vals AI) | Not measured | 64.5% | Only Command A measured |
| CorpFin (Vals AI) | Not measured | 46.0% | Only Command A measured |
| TaxEval (Vals AI) | Not measured | 61.4% | Only Command A measured |
| MedQA (Vals AI) | Not measured | 80.5% | Only Command A measured |
| MedCode (Vals AI) | 49.8% | 19.7% | Claude Opus 5.5 |
| MMLU Pro (Artificial Analysis run) | Not measured | 71.2% | Only Command A measured |
| SimpleQA Verified | 72.2% | Not measured | Only Claude Opus 5.5 measured |
| LMArena Text: science | 1524 | 1339 | Claude Opus 5.5 |
| LMArena Text: medicine and healthcare | 1509 | 1334 | Claude Opus 5.5 |
| LMArena Text: legal and government | 1518 | 1348 | Claude Opus 5.5 |
| LMArena Text: business and finance | 1494 | 1315 | Claude Opus 5.5 |
| Neither model has a result on the other 4 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| Design Arena: websites | 1336 | Not measured | Only Claude Opus 5.5 measured |
| Design Arena: UI components | 1394 | Not measured | Only Claude Opus 5.5 measured |
| Design Arena: game dev | 1457 | Not measured | Only Claude Opus 5.5 measured |
| Design Arena: data viz | 1397 | Not measured | Only Claude Opus 5.5 measured |
| Design Arena: 3D | 1477 | Not measured | Only Claude Opus 5.5 measured |
| Design Arena: all code categories | 1390 | Not measured | Only Claude Opus 5.5 measured |
| Design Arena: SVG | 1333 | Not measured | Only Claude Opus 5.5 measured |
| LiveBench design | 86.9% | Not measured | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index180
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| Vals Index | 70.2% | Not measured | Only Claude Opus 5.5 measured |
| LiveBench data analysis | 80.3% | Not measured | Only Claude Opus 5.5 measured |
| Public Benefits Bench (Vals AI) | 70.6% | Not measured | Only Claude Opus 5.5 measured |
| SAGE (Vals AI) | 45.8% | Not measured | Only Claude Opus 5.5 measured |
| MedScribe (Vals AI) | 91.4% | 55.7% | Claude Opus 5.5 |
| IFBench | Not measured | 73.9% | Only Command A measured |
| Long context reasoning (AA-LCR) | 84.7% | 52.7% | Claude Opus 5.5 |
| DTBench | 98.9% | 61.3% | Claude Opus 5.5 |
| LMCA | 68.2% | 10.3% | Claude Opus 5.5 |
| Furniture assembly | 83.3% | Not measured | Only Claude Opus 5.5 measured |
| LMArena Text | 1516 | 1331 | Claude Opus 5.5 |
| LMArena Text: instruction following | 1537 | 1309 | Claude Opus 5.5 |
| LMArena Text: creative writing | 1535 | 1319 | Claude Opus 5.5 |
| LMArena Vision | 1321 | Not measured | Only Claude Opus 5.5 measured |
| LMArena Text: English | 1519 | 1344 | Claude Opus 5.5 |
| LMArena Text: non-English | 1507 | 1313 | Claude Opus 5.5 |
| LMArena Text: Chinese | 1582 | 1327 | Claude Opus 5.5 |
| LMArena Text: German | Not measured | 1342 | Only Command A measured |
| LMArena Text: Japanese | 1534 | 1285 | Claude Opus 5.5 |
| LMArena Text: Korean | Not measured | 1285 | Only Command A measured |
| LMArena Text: French | 1493 | 1351 | Claude Opus 5.5 |
| LMArena Text: Spanish | 1508 | 1347 | Claude Opus 5.5 |
| LMArena Text: Russian | 1517 | 1314 | Claude Opus 5.5 |
| LMArena Text: Polish | Not measured | 1324 | Only Command A measured |
| LMArena Text: multi-turn | 1501 | 1338 | Claude Opus 5.5 |
| LMArena Text: longer queries | 1532 | 1334 | Claude Opus 5.5 |
| LMArena Text: writing and language | 1532 | 1328 | Claude Opus 5.5 |
| LMArena Text: entertainment and media | 1515 | 1306 | Claude Opus 5.5 |
| LMArena Vision: English | 1317 | Not measured | Only Claude Opus 5.5 measured |
| LMArena Vision: reading text | 1326 | Not measured | Only Claude Opus 5.5 measured |
| LMArena Vision: creative writing | 1320 | Not measured | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 15 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Opus 5.5 | Command A | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Claude Opus 5.5$0.014Fits in one request
Command A$0.0075Fits in one request
Command A costs less
Repository review
50K input + 3K output tokens
Claude Opus 5.5$0.260Fits in one request
Command A$0.155Fits in one request
Command A costs less
Agent loop
200K input + 10K output tokens
Claude Opus 5.5$1.00Fits in one request
Command A$0.600Fits in one request
Command A costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Anthropic Claude Opus 5.5 | Cohere Command A |
|---|---|---|
| Maker | Anthropic | Cohere |
| Weights | No public weights listed | Open weights |
| Released | September 22, 2026 | March 13, 2025 |
| Context window | 1M | 256K |
| Input $/Mtok | $4.00 | $2.50 |
| Output $/Mtok | $20.00 | $10.00 |
| Coding index | 88.8 | Not benchmarked |
| Independent measurements behind it | 5 | 1 |
| Cost per solved task | Not computable | $2.69 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 5.5 better than Command A for coding?
Only Claude Opus 5.5 has a coding score, 88.8 on the Vibe Coding Index; Command A has none, so the two cannot be ranked on coding. Command A has the edge where output tokens cost 2.0x less.
Which is cheaper, Claude Opus 5.5 or Command A?
Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; Command A costs $2.50 and $10.00. Cost per solved task is known for Command A only.
Which has the bigger context window, Claude Opus 5.5 or Command A?
Claude Opus 5.5, with 1M tokens against 256K.
How many benchmarks is the Claude Opus 5.5 vs Command A comparison based on?
35 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5.5's coding index rests on 5 independent benchmarks and Command A's on 1. Where only one model has a result, the page says so instead of naming a winner.