Command A vs GPT-5.6 Terra
Updated October 21, 2026. 51 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Only GPT-5.6 Terra has a coding score, 63.9 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 1.2x less, and where the benchmark that matters is IFBench, where it leads.
- Shared results
- 51
- Command A only
- 9
- GPT-5.6 Terra only
- 73
- 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 GPT-5.6 Terra has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
GPT-5.6 Terra
GPT-5.6 Terra leads, 42.1 against 13.1.
Same board, both measured
Agentic work
AA Agentic Index
GPT-5.6 Terra
GPT-5.6 Terra leads, 43.2 against 1.0.
Same board, both measured
Reasoning
GPQA Diamond
GPT-5.6 Terra
GPT-5.6 Terra leads, 90.9% against 48.5%.
Same board, both measured
Math
AIME
No call
Only Command A has a AIME result, 13.3%.
Directional only
Knowledge
MMLU Pro
GPT-5.6 Terra
GPT-5.6 Terra leads, 86.7% against 69.2%.
Same board, both measured
Web design
Design Arena: websites
No call
Only GPT-5.6 Terra has a Design Arena: websites result, 1269.
Directional only
Long documents
Listed context window
GPT-5.6 Terra
GPT-5.6 Terra takes 1.05M tokens against 256K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Command A
Command A $0.0075, GPT-5.6 Terra $0.0080 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
GPT-5.6 Terra
Command A $2.69, GPT-5.6 Terra $0.42.
Published attempt cost and pass rate
At a glance
- Coding index
- Command A not benchmarked, GPT-5.6 Terra 63.9 from 6 benchmarks.
- Widest category
- Coding, 44.0 points apart on average over 8 shared benchmarks.
- Widest single gap
- SWE-bench Verified (Vals AI): Command A 7.8% against GPT-5.6 Terra 95.4%, 87.6 points apart on a 0 to 100 scale.
- Output price
- Command A $10.00 against GPT-5.6 Terra $12.00 per million output tokens, 1.2x apart.
- Context window
- Command A takes 256K tokens, GPT-5.6 Terra 1.05M.
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 | Command A | Bars | GPT-5.6 Terra | Ties |
|---|---|---|---|---|
| Coding | 0 | 8 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 0 | 3 | ||
| Reasoning | 0 | 6 | ||
| Math | 0 | 2 | ||
| Knowledge | 0 | 9 | ||
| General | 1 | 21 | ||
| All shared boards | 1 | 50 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index08
| Benchmark | Command A | GPT-5.6 Terra | Leader |
|---|---|---|---|
| LiveBench coding | Not measured | 86.2% | Only GPT-5.6 Terra measured |
| LMArena WebDev | Not measured | 1522 | Only GPT-5.6 Terra measured |
| AA Coding Index | 27.8 | 76.7 | GPT-5.6 Terra |
| LiveCodeBench (Vals AI) | 35.1% | 85.9% | GPT-5.6 Terra |
| SWE-bench Verified (Vals AI) | 7.8% | 95.4% | GPT-5.6 Terra |
| Terminal-Bench 4 (Vals AI) | Not measured | 22.7% | Only GPT-5.6 Terra measured |
| Vibe Code Bench (Vals AI) | Not measured | 74.6% | Only GPT-5.6 Terra measured |
| Code migration (Vals AI) | Not measured | 47.8% | Only GPT-5.6 Terra measured |
| ProgramBench (Vals AI) | Not measured | 0.5% | Only GPT-5.6 Terra measured |
| IOI (Vals AI) | Not measured | 87.6% | Only GPT-5.6 Terra measured |
| Terminal-Bench 2.1 (Vals AI) | 17.6% | 77.5% | GPT-5.6 Terra |
| Vibe Code Bench 1-100 (Vals AI) | Not measured | 14.8% | Only GPT-5.6 Terra measured |
| SkillsBench (Vals AI) | Not measured | 58.9% | Only GPT-5.6 Terra measured |
| CyberBench (Vals AI) | Not measured | 72.1% | Only GPT-5.6 Terra measured |
| LiveCodeBench (Artificial Analysis run) | 28.7% | Not measured | Only Command A measured |
| SciCode | 38.5% | 55.0% | GPT-5.6 Terra |
| Terminal-Bench Hard (Artificial Analysis run) | 25.0% | 62.9% | GPT-5.6 Terra |
| FrontierCode | Not measured | 41.3% | Only GPT-5.6 Terra measured |
| WeirdML | Not measured | 78.3% | Only GPT-5.6 Terra measured |
| ALE-Bench | Not measured | 1951.4 | Only GPT-5.6 Terra measured |
| LMArena Text: coding | 1330 | 1485 | GPT-5.6 Terra |
| LMArena Text: software and IT | 1336 | 1482 | GPT-5.6 Terra |
| LMArena WebDev: React | Not measured | 1513 | Only GPT-5.6 Terra measured |
| LMArena WebDev: HTML | Not measured | 1526 | Only GPT-5.6 Terra measured |
| LMArena WebDev: from an image | Not measured | 1541 | Only GPT-5.6 Terra measured |
| Neither model has a result on the other 13 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Command A | GPT-5.6 Terra | Leader |
|---|---|---|---|
| AA Intelligence Index | 13.1 | 42.1 | GPT-5.6 Terra |
| Epoch Capabilities Index | Not measured | 160.1 | Only GPT-5.6 Terra measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | Command A | GPT-5.6 Terra | Leader |
|---|---|---|---|
| AA Agentic Index | 1.0 | 43.2 | GPT-5.6 Terra |
| Design Arena: agents building web apps | Not measured | 1120 | Only GPT-5.6 Terra measured |
| Design Arena: agents building full-stack apps | Not measured | 1061 | Only GPT-5.6 Terra measured |
| Design Arena: agents building mobile apps | Not measured | 1111 | Only GPT-5.6 Terra measured |
| Design Arena: agents building Android apps | Not measured | 1066 | Only GPT-5.6 Terra measured |
| Design Arena: agents building games | Not measured | 1083 | Only GPT-5.6 Terra measured |
| Design Arena: HTML slides | Not measured | 1108 | Only GPT-5.6 Terra measured |
| Design Arena: PowerPoint slides | Not measured | 1131 | Only GPT-5.6 Terra measured |
| LiveBench research | Not measured | 60.4% | Only GPT-5.6 Terra measured |
| LiveBench browser | Not measured | 84.0% | Only GPT-5.6 Terra measured |
| LiveBench long agentic | Not measured | 48.4% | Only GPT-5.6 Terra measured |
| SREBench (Vals AI) | Not measured | 9.5% | Only GPT-5.6 Terra measured |
| Finance Agent (Vals AI) | 9.0% | 54.4% | GPT-5.6 Terra |
| Tax Agent Bench (Vals AI) | Not measured | 30.0% | Only GPT-5.6 Terra measured |
| Legal Research Bench (Vals AI) | Not measured | 41.4% | Only GPT-5.6 Terra measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 66.2% | Only GPT-5.6 Terra measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 10.0% | Only GPT-5.6 Terra measured |
| τ²-Bench Telecom | 80.7% | 86.3% | GPT-5.6 Terra |
| APEX-Agents | Not measured | 58.2% | Only GPT-5.6 Terra measured |
| BALROG | Not measured | 53.2% | Only GPT-5.6 Terra measured |
| Vending-Bench 2 | Not measured | $7,343 | Only GPT-5.6 Terra measured |
| Neither model has a result on the other 18 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index06
| Benchmark | Command A | GPT-5.6 Terra | Leader |
|---|---|---|---|
| GPQA Diamond | 48.5% | 90.9% | GPT-5.6 Terra |
| LiveBench reasoning | Not measured | 90.6% | Only GPT-5.6 Terra measured |
| MMMU Pro (Vals AI) | Not measured | 86.5% | Only GPT-5.6 Terra measured |
| GPQA Diamond (Artificial Analysis run) | 76.1% | 92.5% | GPT-5.6 Terra |
| Humanity's Last Exam (Artificial Analysis run) | 12.0% | 42.9% | GPT-5.6 Terra |
| GPQA Diamond (Epoch AI run) | Not measured | 93.3% | Only GPT-5.6 Terra measured |
| ARC-AGI | Not measured | 96.5% | Only GPT-5.6 Terra measured |
| ARC-AGI-2 | Not measured | 83.9% | Only GPT-5.6 Terra measured |
| SimpleBench | Not measured | 48.9% | Only GPT-5.6 Terra measured |
| Chess puzzles | Not measured | 47.0% | Only GPT-5.6 Terra measured |
| Mystery game puzzles | Not measured | 35.0% | Only GPT-5.6 Terra measured |
| LMArena Text: hard prompts | 1326 | 1469 | GPT-5.6 Terra |
| LMArena Text: expert | 1296 | 1496 | GPT-5.6 Terra |
| LMArena Text: hard prompts in English | 1335 | 1465 | GPT-5.6 Terra |
| LMArena Vision: diagrams | Not measured | 1295 | Only GPT-5.6 Terra measured |
| LMArena Vision: homework | Not measured | 1312 | Only GPT-5.6 Terra measured |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Command A | GPT-5.6 Terra | Leader |
|---|---|---|---|
| AIME | 13.3% | Not measured | Only Command A measured |
| MATH 500 (Vals AI) | 76.2% | Not measured | Only Command A measured |
| MGSM (Vals AI) | 85.7% | Not measured | Only Command A measured |
| AA Math Index | 13.0 | Not measured | Only Command A measured |
| AIME 2025 (Artificial Analysis run) | 13.0% | Not measured | Only Command A measured |
| OTIS Mock AIME | Not measured | 99.7% | Only GPT-5.6 Terra measured |
| FrontierMath, tiers 1 to 3 | Not measured | 86.0% | Only GPT-5.6 Terra measured |
| FrontierMath, tier 4 | Not measured | 70.7% | Only GPT-5.6 Terra measured |
| ProofBench | Not measured | 74.0% | Only GPT-5.6 Terra measured |
| LMArena Text: math | 1300 | 1465 | GPT-5.6 Terra |
| LMArena Text: mathematical work | 1312 | 1478 | GPT-5.6 Terra |
| Neither model has a result on the other 2 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index09
| Benchmark | Command A | GPT-5.6 Terra | Leader |
|---|---|---|---|
| MMLU Pro | 69.2% | 86.7% | GPT-5.6 Terra |
| LegalBench (Vals AI) | 79.7% | 85.1% | GPT-5.6 Terra |
| CaseLaw (Vals AI) | 64.5% | Not measured | Only Command A measured |
| CorpFin (Vals AI) | 46.0% | 65.3% | GPT-5.6 Terra |
| TaxEval (Vals AI) | 61.4% | 76.2% | GPT-5.6 Terra |
| MortgageTax (Vals AI) | Not measured | 67.3% | Only GPT-5.6 Terra measured |
| MedQA (Vals AI) | 80.5% | Not measured | Only Command A measured |
| MedCode (Vals AI) | 19.7% | 43.4% | GPT-5.6 Terra |
| MMLU Pro (Artificial Analysis run) | 71.2% | Not measured | Only Command A measured |
| SimpleQA Verified | Not measured | 43.2% | Only GPT-5.6 Terra measured |
| LMArena Text: science | 1339 | 1452 | GPT-5.6 Terra |
| LMArena Text: medicine and healthcare | 1334 | 1430 | GPT-5.6 Terra |
| LMArena Text: legal and government | 1348 | 1461 | GPT-5.6 Terra |
| LMArena Text: business and finance | 1315 | 1448 | GPT-5.6 Terra |
| Neither model has a result on the other 3 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
| Benchmark | Command A | GPT-5.6 Terra | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1269 | Only GPT-5.6 Terra measured |
| Design Arena: UI components | Not measured | 1259 | Only GPT-5.6 Terra measured |
| Design Arena: game dev | Not measured | 1230 | Only GPT-5.6 Terra measured |
| Design Arena: data viz | Not measured | 1239 | Only GPT-5.6 Terra measured |
| Design Arena: 3D | Not measured | 1135 | Only GPT-5.6 Terra measured |
| Design Arena: all code categories | Not measured | 1241 | Only GPT-5.6 Terra measured |
| Design Arena: SVG | Not measured | 1220 | Only GPT-5.6 Terra measured |
| Design Arena: ASCII art | Not measured | 1177 | Only GPT-5.6 Terra measured |
| LiveBench design | Not measured | 76.0% | Only GPT-5.6 Terra measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index121
| Benchmark | Command A | GPT-5.6 Terra | Leader |
|---|---|---|---|
| LiveBench data analysis | Not measured | 79.3% | Only GPT-5.6 Terra measured |
| Public Benefits Bench (Vals AI) | Not measured | 62.4% | Only GPT-5.6 Terra measured |
| SAGE (Vals AI) | Not measured | 47.0% | Only GPT-5.6 Terra measured |
| MedScribe (Vals AI) | 55.7% | 82.9% | GPT-5.6 Terra |
| Vals Multimodal Index | Not measured | 65.1% | Only GPT-5.6 Terra measured |
| IFBench | 73.9% | 71.2% | Command A |
| Long context reasoning (AA-LCR) | 52.7% | 83.0% | GPT-5.6 Terra |
| DTBench | 61.3% | 93.3% | GPT-5.6 Terra |
| LMCA | 10.3% | 54.9% | GPT-5.6 Terra |
| Surface Evolver Bench | Not measured | 83.8% | Only GPT-5.6 Terra measured |
| Furniture assembly | Not measured | 54.2% | Only GPT-5.6 Terra measured |
| LMArena Text | 1331 | 1448 | GPT-5.6 Terra |
| LMArena Text: instruction following | 1309 | 1456 | GPT-5.6 Terra |
| LMArena Text: creative writing | 1319 | 1413 | GPT-5.6 Terra |
| LMArena Vision | Not measured | 1271 | Only GPT-5.6 Terra measured |
| LMArena Text: English | 1344 | 1449 | GPT-5.6 Terra |
| LMArena Text: non-English | 1313 | 1441 | GPT-5.6 Terra |
| LMArena Text: Chinese | 1327 | 1514 | GPT-5.6 Terra |
| LMArena Text: German | 1342 | 1460 | GPT-5.6 Terra |
| LMArena Text: Japanese | 1285 | 1454 | GPT-5.6 Terra |
| LMArena Text: Korean | 1285 | 1427 | GPT-5.6 Terra |
| LMArena Text: French | 1351 | 1466 | GPT-5.6 Terra |
| LMArena Text: Spanish | 1347 | 1451 | GPT-5.6 Terra |
| LMArena Text: Russian | 1314 | 1452 | GPT-5.6 Terra |
| LMArena Text: Polish | 1324 | 1446 | GPT-5.6 Terra |
| LMArena Text: multi-turn | 1338 | 1453 | GPT-5.6 Terra |
| LMArena Text: longer queries | 1334 | 1454 | GPT-5.6 Terra |
| LMArena Text: writing and language | 1328 | 1431 | GPT-5.6 Terra |
| LMArena Text: entertainment and media | 1306 | 1418 | GPT-5.6 Terra |
| LMArena Vision: English | Not measured | 1272 | Only GPT-5.6 Terra measured |
| LMArena Vision: Chinese | Not measured | 1337 | Only GPT-5.6 Terra measured |
| LMArena Vision: reading text | Not measured | 1278 | Only GPT-5.6 Terra measured |
| LMArena Vision: humor | Not measured | 1236 | Only GPT-5.6 Terra measured |
| LMArena Vision: creative writing | Not measured | 1248 | Only GPT-5.6 Terra measured |
| LMArena Document | Not measured | 1472 | Only GPT-5.6 Terra measured |
| Neither model has a result on the other 11 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Command A | GPT-5.6 Terra | 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
GPT-5.6 Terra costs less
Agent loop
200K input + 10K output tokens
GPT-5.6 Terra 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 | Cohere Command A | OpenAI GPT-5.6 Terra |
|---|---|---|
| Maker | Cohere | OpenAI |
| Weights | Open weights | No public weights listed |
| Released | March 13, 2025 | July 9, 2026 |
| Context window | 256K | 1.05M |
| Input $/Mtok | $2.50 | $2.00 |
| Output $/Mtok | $10.00 | $12.00 |
| Coding index | Not benchmarked | 63.9 |
| Independent measurements behind it | 1 | 6 |
| Cost per solved task | $2.69 | $0.42 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Command A better than GPT-5.6 Terra for coding?
Only GPT-5.6 Terra has a coding score, 63.9 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 1.2x less, and where the benchmark that matters is IFBench, where it leads.
Which is cheaper, Command A or GPT-5.6 Terra?
Command A costs $2.50 per million input tokens and $10.00 per million output tokens; GPT-5.6 Terra costs $2.00 and $12.00. Per solved SWE-bench Verified task, Command A costs $2.69 and GPT-5.6 Terra $0.42.
Which has the bigger context window, Command A or GPT-5.6 Terra?
GPT-5.6 Terra, with 1.05M tokens against 256K.
How many benchmarks is the Command A vs GPT-5.6 Terra comparison based on?
51 benchmarks have a result for both models as of October 21, 2026. Command A's coding index rests on 1 independent benchmark and GPT-5.6 Terra's on 6. Where only one model has a result, the page says so instead of naming a winner.