Claude Sonnet 4.5 vs Command A
Updated October 21, 2026. 46 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Only Claude Sonnet 4.5 has a coding score, 39.5 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 1.5x less, and where the benchmark that matters is CaseLaw (Vals AI), where it leads.
- Shared results
- 46
- Claude Sonnet 4.5 only
- 46
- Command A only
- 14
- 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 Sonnet 4.5 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Claude Sonnet 4.5
Claude Sonnet 4.5 leads, 20.7 against 13.1.
Same board, both measured
Agentic work
AA Agentic Index
Claude Sonnet 4.5
Claude Sonnet 4.5 leads, 15.8 against 1.0.
Same board, both measured
Reasoning
GPQA Diamond
Claude Sonnet 4.5
Claude Sonnet 4.5 leads, 81.6% against 48.5%.
Same board, both measured
Math
AIME
Claude Sonnet 4.5
Claude Sonnet 4.5 leads, 88.2% against 13.3%.
Same board, both measured
Knowledge
MMLU Pro
Claude Sonnet 4.5
Claude Sonnet 4.5 leads, 87.4% against 69.2%.
Same board, both measured
Web design
Design Arena: websites
No call
Only Claude Sonnet 4.5 has a Design Arena: websites result, 1190.
Directional only
Long documents
Listed context window
Claude Sonnet 4.5
Claude Sonnet 4.5 takes 1M tokens against 256K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Command A
Claude Sonnet 4.5 $0.011, Command A $0.0075 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Claude Sonnet 4.5
Claude Sonnet 4.5 $1.16, Command A $2.69.
Published attempt cost and pass rate
At a glance
- Coding index
- Claude Sonnet 4.5 39.5 from 3 benchmarks, Command A not benchmarked.
- Widest category
- Coding, 34.7 points apart on average over 5 shared benchmarks.
- Widest single gap
- AIME: Claude Sonnet 4.5 88.2% against Command A 13.3%, 74.9 points apart on a 0 to 100 scale.
- Output price
- Claude Sonnet 4.5 $15.00 against Command A $10.00 per million output tokens, 1.5x apart.
- Context window
- Claude Sonnet 4.5 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 Sonnet 4.5 | Bars | Command A | Ties |
|---|---|---|---|---|
| Coding | 5 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 1 | 0 | ||
| Reasoning | 4 | 0 | ||
| Math | 4 | 0 | ||
| Knowledge | 10 | 1 | ||
| General | 20 | 0 | ||
| All shared boards | 45 | 1 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index50
| Benchmark | Claude Sonnet 4.5 | Command A | Leader |
|---|---|---|---|
| SWE-bench Verified | 74.8% | Not measured | Only Claude Sonnet 4.5 measured |
| SWE-bench Multilingual | 67.0% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena WebDev | 1394 | Not measured | Only Claude Sonnet 4.5 measured |
| AA Coding Index | 52.1 | 27.8 | Claude Sonnet 4.5 |
| LiveCodeBench (Vals AI) | 73.0% | 35.1% | Claude Sonnet 4.5 |
| SWE-bench Verified (Vals AI) | 70.0% | 7.8% | Claude Sonnet 4.5 |
| Vibe Code Bench (Vals AI) | 22.6% | Not measured | Only Claude Sonnet 4.5 measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 17.6% | Only Command A measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 28.7% | Only Command A measured |
| SciCode | Not measured | 38.5% | Only Command A measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 25.0% | Only Command A measured |
| Terminal-Bench | 46.5% | Not measured | Only Claude Sonnet 4.5 measured |
| GSO-Bench | 14.7% | Not measured | Only Claude Sonnet 4.5 measured |
| WeirdML | 47.7% | Not measured | Only Claude Sonnet 4.5 measured |
| Cybench | 60.0% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: coding | 1488 | 1330 | Claude Sonnet 4.5 |
| LMArena Text: software and IT | 1473 | 1336 | Claude Sonnet 4.5 |
| LMArena WebDev: React | 1386 | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena WebDev: HTML | 1399 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 19 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Sonnet 4.5 | Command A | Leader |
|---|---|---|---|
| AA Intelligence Index | 20.7 | 13.1 | Claude Sonnet 4.5 |
| Epoch Capabilities Index | 146.7 | Not measured | Only Claude Sonnet 4.5 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Sonnet 4.5 | Command A | Leader |
|---|---|---|---|
| AA Agentic Index | 15.8 | 1.0 | Claude Sonnet 4.5 |
| Design Arena: agents building web apps | 1059 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: agents building full-stack apps | 1050 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: agents building mobile apps | 1137 | Not measured | Only Claude Sonnet 4.5 measured |
| Finance Agent (Vals AI) | Not measured | 9.0% | Only Command A measured |
| τ²-Bench Telecom | Not measured | 80.7% | Only Command A measured |
| METR time horizons | 67.4% | Not measured | Only Claude Sonnet 4.5 measured |
| Remote Labor Index | 2.1% | Not measured | Only Claude Sonnet 4.5 measured |
| GDPval | 42.5% | Not measured | Only Claude Sonnet 4.5 measured |
| DeepResearch Bench | 52.6% | Not measured | Only Claude Sonnet 4.5 measured |
| OSWorld | 62.9% | Not measured | Only Claude Sonnet 4.5 measured |
| Vending-Bench 2 | $3,839 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 27 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Sonnet 4.5 | Command A | Leader |
|---|---|---|---|
| GPQA Diamond | 81.6% | 48.5% | Claude Sonnet 4.5 |
| MMMU Pro (Vals AI) | 79.3% | Not measured | Only Claude Sonnet 4.5 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 76.1% | Only Command A measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 12.0% | Only Command A measured |
| GPQA Diamond (Epoch AI run) | 82.3% | Not measured | Only Claude Sonnet 4.5 measured |
| ARC-AGI | 63.7% | Not measured | Only Claude Sonnet 4.5 measured |
| ARC-AGI-2 | 13.6% | Not measured | Only Claude Sonnet 4.5 measured |
| SimpleBench | 54.3% | Not measured | Only Claude Sonnet 4.5 measured |
| Chess puzzles | 10.0% | Not measured | Only Claude Sonnet 4.5 measured |
| Mystery game puzzles | 17.0% | Not measured | Only Claude Sonnet 4.5 measured |
| EBR-bench | 2.4% | Not measured | Only Claude Sonnet 4.5 measured |
| VPCT | 39.8% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: hard prompts | 1462 | 1326 | Claude Sonnet 4.5 |
| LMArena Text: expert | 1483 | 1296 | Claude Sonnet 4.5 |
| LMArena Text: hard prompts in English | 1471 | 1335 | Claude Sonnet 4.5 |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Sonnet 4.5 | Command A | Leader |
|---|---|---|---|
| AIME | 88.2% | 13.3% | Claude Sonnet 4.5 |
| MATH 500 (Vals AI) | Not measured | 76.2% | Only Command A measured |
| MGSM (Vals AI) | 94.3% | 85.7% | Claude Sonnet 4.5 |
| 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 | 77.8% | Not measured | Only Claude Sonnet 4.5 measured |
| FrontierMath, tiers 1 to 3 | 23.9% | Not measured | Only Claude Sonnet 4.5 measured |
| FrontierMath, tier 4 | 2.4% | Not measured | Only Claude Sonnet 4.5 measured |
| ProofBench | 19.0% | Not measured | Only Claude Sonnet 4.5 measured |
| MATH level 5 | 97.7% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: math | 1449 | 1300 | Claude Sonnet 4.5 |
| LMArena Text: mathematical work | 1462 | 1312 | Claude Sonnet 4.5 |
| Neither model has a result on the other 1 board here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
| Benchmark | Claude Sonnet 4.5 | Command A | Leader |
|---|---|---|---|
| MMLU Pro | 87.4% | 69.2% | Claude Sonnet 4.5 |
| LegalBench (Vals AI) | 84.1% | 79.7% | Claude Sonnet 4.5 |
| CaseLaw (Vals AI) | 62.2% | 64.5% | Command A |
| CorpFin (Vals AI) | 62.0% | 46.0% | Claude Sonnet 4.5 |
| TaxEval (Vals AI) | 73.3% | 61.4% | Claude Sonnet 4.5 |
| MortgageTax (Vals AI) | 64.0% | Not measured | Only Claude Sonnet 4.5 measured |
| MedQA (Vals AI) | 94.7% | 80.5% | Claude Sonnet 4.5 |
| MedCode (Vals AI) | 44.1% | 19.7% | Claude Sonnet 4.5 |
| MMLU Pro (Artificial Analysis run) | Not measured | 71.2% | Only Command A measured |
| SimpleQA Verified | 30.7% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: science | 1448 | 1339 | Claude Sonnet 4.5 |
| LMArena Text: medicine and healthcare | 1444 | 1334 | Claude Sonnet 4.5 |
| LMArena Text: legal and government | 1451 | 1348 | Claude Sonnet 4.5 |
| LMArena Text: business and finance | 1440 | 1315 | Claude Sonnet 4.5 |
| Neither model has a result on the other 3 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | Claude Sonnet 4.5 | Command A | Leader |
|---|---|---|---|
| Design Arena: websites | 1190 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: UI components | 1173 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: game dev | 1166 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: data viz | 1167 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: 3D | 1158 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: all code categories | 1183 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: SVG | 1115 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: ASCII art | 1204 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index200
| Benchmark | Claude Sonnet 4.5 | Command A | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 36.1% | Not measured | Only Claude Sonnet 4.5 measured |
| MedScribe (Vals AI) | 84.5% | 55.7% | Claude Sonnet 4.5 |
| IFBench | Not measured | 73.9% | Only Command A measured |
| Long context reasoning (AA-LCR) | Not measured | 52.7% | Only Command A measured |
| DTBench | 83.2% | 61.3% | Claude Sonnet 4.5 |
| LMCA | 38.8% | 10.3% | Claude Sonnet 4.5 |
| LMArena Text | 1438 | 1331 | Claude Sonnet 4.5 |
| LMArena Text: instruction following | 1459 | 1309 | Claude Sonnet 4.5 |
| LMArena Text: creative writing | 1442 | 1319 | Claude Sonnet 4.5 |
| LMArena Text: English | 1450 | 1344 | Claude Sonnet 4.5 |
| LMArena Text: non-English | 1425 | 1313 | Claude Sonnet 4.5 |
| LMArena Text: Chinese | 1460 | 1327 | Claude Sonnet 4.5 |
| LMArena Text: German | 1427 | 1342 | Claude Sonnet 4.5 |
| LMArena Text: Japanese | 1390 | 1285 | Claude Sonnet 4.5 |
| LMArena Text: Korean | 1402 | 1285 | Claude Sonnet 4.5 |
| LMArena Text: French | 1459 | 1351 | Claude Sonnet 4.5 |
| LMArena Text: Spanish | 1458 | 1347 | Claude Sonnet 4.5 |
| LMArena Text: Russian | 1437 | 1314 | Claude Sonnet 4.5 |
| LMArena Text: Polish | 1423 | 1324 | Claude Sonnet 4.5 |
| LMArena Text: multi-turn | 1465 | 1338 | Claude Sonnet 4.5 |
| LMArena Text: longer queries | 1475 | 1334 | Claude Sonnet 4.5 |
| LMArena Text: writing and language | 1442 | 1328 | Claude Sonnet 4.5 |
| LMArena Text: entertainment and media | 1428 | 1306 | Claude Sonnet 4.5 |
| LMArena Document | 1450 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 22 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Sonnet 4.5 | 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
Command A costs less
Repository review
50K input + 3K output tokens
Command A costs less
Agent loop
200K input + 10K output tokens
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 Sonnet 4.5 | Cohere Command A |
|---|---|---|
| Maker | Anthropic | Cohere |
| Weights | No public weights listed | Open weights |
| Released | September 29, 2025 | March 13, 2025 |
| Context window | 1M | 256K |
| Input $/Mtok | $3.00 | $2.50 |
| Output $/Mtok | $15.00 | $10.00 |
| Coding index | 39.5 | Not benchmarked |
| Independent measurements behind it | 3 | 1 |
| Cost per solved task | $1.16 | $2.69 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Sonnet 4.5 better than Command A for coding?
Only Claude Sonnet 4.5 has a coding score, 39.5 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 1.5x less, and where the benchmark that matters is CaseLaw (Vals AI), where it leads.
Which is cheaper, Claude Sonnet 4.5 or Command A?
Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; Command A costs $2.50 and $10.00. Per solved SWE-bench Verified task, Claude Sonnet 4.5 costs $1.16 and Command A $2.69.
Which has the bigger context window, Claude Sonnet 4.5 or Command A?
Claude Sonnet 4.5, with 1M tokens against 256K.
How many benchmarks is the Claude Sonnet 4.5 vs Command A comparison based on?
46 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 4.5's coding index rests on 3 independent benchmarks and Command A's on 1. Where only one model has a result, the page says so instead of naming a winner.