Claude Opus 4.1 vs GPT-6 Astra
GPT-6 Astra leads Claude Opus 4.1 on the Artificial Analysis Intelligence Index, 52.7 to 22.8, and GPT-6 Astra costs 1.5x less per output token ($50.00 vs $75.00 per million). Updated October 22, 2026; 54 benchmarks have a result for both.
Claude Opus 4.1 or GPT-6 Astra: which to pick
Only GPT-6 Astra has a coding score, 85.1 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding.
Pick Claude Opus 4.1 for work measured by LMArena Text: French or LMArena Text: Spanish, where it leads.
- Shared results
- 54
- Claude Opus 4.1 only
- 19
- GPT-6 Astra only
- 67
- Like-for-like categories
- 7 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
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-6 Astra has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
GPT-6 Astra
GPT-6 Astra leads, 52.7 against 22.8.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only GPT-6 Astra has a AA Agentic Index result, 51.0.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Opus 4.1 has a GPQA Diamond result, 76.3%.
Directional only
Math
AIME
No call
Only Claude Opus 4.1 has a AIME result, 78.2%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Opus 4.1 has a MMLU Pro result, 87.9%.
Directional only
Web design
Design Arena: websites
GPT-6 Astra
GPT-6 Astra leads, 1336 against 1176.
Same board, both measured
General
Vals Index
No call
Only GPT-6 Astra has a Vals Index result, 65.0%.
Directional only
Long documents
Listed context window
GPT-6 Astra
GPT-6 Astra takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GPT-6 Astra
Claude Opus 4.1 $0.052, GPT-6 Astra $0.035 per turn.
List prices
At a glance
- Coding index
- Claude Opus 4.1 not benchmarked, GPT-6 Astra 85.1 from 5 benchmarks.
- Widest category
- Math, 44.3 points apart on average over 5 shared benchmarks.
- Widest single gap
- FrontierMath, tier 4: Claude Opus 4.1 2.4% against GPT-6 Astra 97.6%, 95.2 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 4.1 $75.00 against GPT-6 Astra $50.00 per million output tokens, 1.5x apart.
- Context window
- Claude Opus 4.1 takes 200K tokens, GPT-6 Astra 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 | Claude Opus 4.1 | Bars | GPT-6 Astra | Ties |
|---|---|---|---|---|
| Coding | 0 | 6 | ||
| Intelligence | 0 | 2 | ||
| Reasoning | 0 | 6 | ||
| Math | 0 | 5 | ||
| Knowledge | 0 | 6 | ||
| Web design | 0 | 8 | ||
| General | 2 | 19 | ||
| All shared boards | 2 | 52 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index06
| Benchmark | Claude Opus 4.1 | GPT-6 Astra | Leader |
|---|---|---|---|
| LiveBench coding | Not measured | 93.7% | Only GPT-6 Astra measured |
| LMArena WebDev | 1390 | 1774 | GPT-6 Astra |
| AA Coding Index | Not measured | 76.9 | Only GPT-6 Astra measured |
| LiveCodeBench (Vals AI) | 66.5% | Not measured | Only Claude Opus 4.1 measured |
| Terminal-Bench 4 (Vals AI) | Not measured | 59.6% | Only GPT-6 Astra measured |
| Vibe Code Bench (Vals AI) | Not measured | 89.6% | Only GPT-6 Astra measured |
| Code migration (Vals AI) | Not measured | 67.7% | Only GPT-6 Astra measured |
| ProgramBench (Vals AI) | Not measured | 5.5% | Only GPT-6 Astra measured |
| IOI (Vals AI) | Not measured | 100.0% | Only GPT-6 Astra measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 87.3% | Only GPT-6 Astra measured |
| SWE-bench Multimodal (Vals AI) | Not measured | 43.3% | Only GPT-6 Astra measured |
| Vibe Code Bench 1-100 (Vals AI) | Not measured | 27.6% | Only GPT-6 Astra measured |
| CyberBench (Vals AI) | Not measured | 41.1% | Only GPT-6 Astra measured |
| SciCode | Not measured | 56.5% | Only GPT-6 Astra measured |
| Terminal-Bench | 38.0% | Not measured | Only Claude Opus 4.1 measured |
| FrontierCode | Not measured | 53.3% | Only GPT-6 Astra measured |
| FrontierSWE | Not measured | 65.5% | Only GPT-6 Astra measured |
| GSO-Bench | Not measured | 79.4% | Only GPT-6 Astra measured |
| WeirdML | 45.9% | 93.3% | GPT-6 Astra |
| MirrorCode | Not measured | 46.7% | Only GPT-6 Astra measured |
| Cybench | 42.0% | Not measured | Only Claude Opus 4.1 measured |
| ALE-Bench | Not measured | 2951.3 | Only GPT-6 Astra measured |
| LMArena Text: coding | 1479 | 1489 | GPT-6 Astra |
| LMArena Text: software and IT | 1456 | 1474 | GPT-6 Astra |
| LMArena WebDev: React | Not measured | 1798 | Only GPT-6 Astra measured |
| LMArena WebDev: HTML | 1399 | 1775 | GPT-6 Astra |
| LMArena WebDev: from an image | Not measured | 1726 | Only GPT-6 Astra measured |
| SciCode | 4.6% | 12.3% | GPT-6 Astra |
| Neither model has a result on the other 11 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Claude Opus 4.1 | GPT-6 Astra | Leader |
|---|---|---|---|
| AA Intelligence Index | 22.8 | 52.7 | GPT-6 Astra |
| Epoch Capabilities Index | 144.1 | 168.8 | GPT-6 Astra |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index30 boards, none shared
| Benchmark | Claude Opus 4.1 | GPT-6 Astra | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 51.0 | Only GPT-6 Astra measured |
| Design Arena: agents building web apps | Not measured | 1373 | Only GPT-6 Astra measured |
| Design Arena: agents building full-stack apps | Not measured | 1357 | Only GPT-6 Astra measured |
| Design Arena: agents building mobile apps | Not measured | 1312 | Only GPT-6 Astra measured |
| Design Arena: agents building Godot games | Not measured | 1348 | Only GPT-6 Astra measured |
| Design Arena: PowerPoint slides | Not measured | 1219 | Only GPT-6 Astra measured |
| Design Arena: spreadsheets | Not measured | 1365 | Only GPT-6 Astra measured |
| LiveBench research | Not measured | 85.2% | Only GPT-6 Astra measured |
| LiveBench browser | Not measured | 84.0% | Only GPT-6 Astra measured |
| LiveBench long agentic | Not measured | 82.4% | Only GPT-6 Astra measured |
| SREBench (Vals AI) | Not measured | 56.9% | Only GPT-6 Astra measured |
| Finance Agent (Vals AI) | Not measured | 53.5% | Only GPT-6 Astra measured |
| Tax Agent Bench (Vals AI) | Not measured | 20.7% | Only GPT-6 Astra measured |
| Legal Research Bench (Vals AI) | Not measured | 39.4% | Only GPT-6 Astra measured |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 7.1% | Only GPT-6 Astra measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 71.7% | Only GPT-6 Astra measured |
| BioMysteryBench (Vals AI) | Not measured | 79.3% | Only GPT-6 Astra measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 62.9% | Only GPT-6 Astra measured |
| Vals Science Index | Not measured | 65.1% | Only GPT-6 Astra measured |
| Time Horizon Index (Vals AI) | Not measured | 90.5% | Only GPT-6 Astra measured |
| CUA-bench (Vals AI) | Not measured | 19.2% | Only GPT-6 Astra measured |
| Robo-bench (Vals AI) | Not measured | 23.3% | Only GPT-6 Astra measured |
| APEX-Agents | Not measured | 64.7% | Only GPT-6 Astra measured |
| METR time horizons | 66.8% | Not measured | Only Claude Opus 4.1 measured |
| Remote Labor Index | Not measured | 20.8% | Only GPT-6 Astra measured |
| GDPval | 43.6% | Not measured | Only Claude Opus 4.1 measured |
| BALROG | Not measured | 68.3% | Only GPT-6 Astra measured |
| DeepResearch Bench | 48.3% | Not measured | Only Claude Opus 4.1 measured |
| SpireClimb | Not measured | 25.7% | Only GPT-6 Astra measured |
| Vending-Bench 2 | Not measured | $15,515 | Only GPT-6 Astra measured |
| Neither model has a result on the other 11 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index06
| Benchmark | Claude Opus 4.1 | GPT-6 Astra | Leader |
|---|---|---|---|
| GPQA Diamond | 76.3% | Not measured | Only Claude Opus 4.1 measured |
| LiveBench reasoning | Not measured | 92.7% | Only GPT-6 Astra measured |
| MysteryMechanism (Vals AI) | Not measured | 53.1% | Only GPT-6 Astra measured |
| MMMU Pro (Vals AI) | 77.5% | Not measured | Only Claude Opus 4.1 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 96.3% | Only GPT-6 Astra measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 54.7% | Only GPT-6 Astra measured |
| GPQA Diamond (Epoch AI run) | 77.3% | 95.8% | GPT-6 Astra |
| ARC-AGI | Not measured | 98.5% | Only GPT-6 Astra measured |
| ARC-AGI-2 | Not measured | 95.0% | Only GPT-6 Astra measured |
| SimpleBench | 60.0% | Not measured | Only Claude Opus 4.1 measured |
| Chess puzzles | Not measured | 74.0% | Only GPT-6 Astra measured |
| Mystery game puzzles | 21.0% | 84.0% | GPT-6 Astra |
| EBR-bench | 7.9% | 76.2% | GPT-6 Astra |
| VPCT | 35.0% | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: hard prompts | 1442 | 1463 | GPT-6 Astra |
| LMArena Text: expert | 1438 | 1489 | GPT-6 Astra |
| LMArena Text: hard prompts in English | 1451 | 1464 | GPT-6 Astra |
| LMArena Vision: diagrams | Not measured | 1297 | Only GPT-6 Astra measured |
| LMArena Vision: homework | Not measured | 1337 | Only GPT-6 Astra measured |
| Neither model has a result on the other 3 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | Claude Opus 4.1 | GPT-6 Astra | Leader |
|---|---|---|---|
| AIME | 78.2% | Not measured | Only Claude Opus 4.1 measured |
| MATH 500 (Vals AI) | 95.4% | Not measured | Only Claude Opus 4.1 measured |
| MGSM (Vals AI) | 94.4% | Not measured | Only Claude Opus 4.1 measured |
| OTIS Mock AIME | 68.9% | 100.0% | GPT-6 Astra |
| FrontierMath, tiers 1 to 3 | 12.6% | 93.7% | GPT-6 Astra |
| FrontierMath, tier 4 | 2.4% | 97.6% | GPT-6 Astra |
| ProofBench | Not measured | 99.0% | Only GPT-6 Astra measured |
| LMArena Text: math | 1431 | 1465 | GPT-6 Astra |
| LMArena Text: mathematical work | 1434 | 1484 | GPT-6 Astra |
| Neither model has a result on the other 4 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index06
| Benchmark | Claude Opus 4.1 | GPT-6 Astra | Leader |
|---|---|---|---|
| MMLU Pro | 87.9% | Not measured | Only Claude Opus 4.1 measured |
| LegalBench (Vals AI) | 83.5% | Not measured | Only Claude Opus 4.1 measured |
| TaxEval (Vals AI) | 73.7% | Not measured | Only Claude Opus 4.1 measured |
| MortgageTax (Vals AI) | 61.1% | Not measured | Only Claude Opus 4.1 measured |
| MedQA (Vals AI) | 93.6% | Not measured | Only Claude Opus 4.1 measured |
| MedCode (Vals AI) | 47.2% | 48.5% | GPT-6 Astra |
| SimpleQA Verified | Not measured | 75.6% | Only GPT-6 Astra measured |
| LMArena Text: science | 1422 | 1451 | GPT-6 Astra |
| LMArena Text: medicine and healthcare | 1416 | 1425 | GPT-6 Astra |
| LMArena Text: legal and government | 1421 | 1462 | GPT-6 Astra |
| LMArena Text: business and finance | 1406 | 1439 | GPT-6 Astra |
| FACTS Benchmark Suite | 40.4% | 75.7% | GPT-6 Astra |
| Neither model has a result on the other 6 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index08
| Benchmark | Claude Opus 4.1 | GPT-6 Astra | Leader |
|---|---|---|---|
| Design Arena: websites | 1176 | 1336 | GPT-6 Astra |
| Design Arena: UI components | 1162 | 1393 | GPT-6 Astra |
| Design Arena: game dev | 1171 | 1478 | GPT-6 Astra |
| Design Arena: data viz | 1166 | 1335 | GPT-6 Astra |
| Design Arena: 3D | 1152 | 1500 | GPT-6 Astra |
| Design Arena: all code categories | 1170 | 1379 | GPT-6 Astra |
| Design Arena: SVG | 1152 | 1431 | GPT-6 Astra |
| Design Arena: ASCII art | 1167 | 1353 | GPT-6 Astra |
| LiveBench design | Not measured | 82.0% | Only GPT-6 Astra measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index219
| Benchmark | Claude Opus 4.1 | GPT-6 Astra | Leader |
|---|---|---|---|
| Vals Index | Not measured | 65.0% | Only GPT-6 Astra measured |
| LiveBench data analysis | Not measured | 83.0% | Only GPT-6 Astra measured |
| SAGE (Vals AI) | 31.4% | 46.4% | GPT-6 Astra |
| MedScribe (Vals AI) | 73.9% | 87.9% | GPT-6 Astra |
| Long context reasoning (AA-LCR) | Not measured | 80.7% | Only GPT-6 Astra measured |
| DTBench | 80.0% | 97.3% | GPT-6 Astra |
| LMCA | 37.1% | 64.4% | GPT-6 Astra |
| Creative writing (Lech Mazur) | 84.7% | Not measured | Only Claude Opus 4.1 measured |
| Furniture assembly | Not measured | 80.0% | Only GPT-6 Astra measured |
| LMArena Text | 1419 | 1441 | GPT-6 Astra |
| LMArena Text: instruction following | 1435 | 1455 | GPT-6 Astra |
| LMArena Text: creative writing | 1412 | 1420 | GPT-6 Astra |
| LMArena Vision | Not measured | 1280 | Only GPT-6 Astra measured |
| LMArena Text: English | 1433 | 1447 | GPT-6 Astra |
| LMArena Text: non-English | 1405 | 1432 | GPT-6 Astra |
| LMArena Text: Chinese | 1427 | 1489 | GPT-6 Astra |
| LMArena Text: German | 1413 | 1459 | GPT-6 Astra |
| LMArena Text: Japanese | 1377 | 1405 | GPT-6 Astra |
| LMArena Text: Korean | 1381 | 1428 | GPT-6 Astra |
| LMArena Text: French | 1433 | 1432 | Claude Opus 4.1 |
| LMArena Text: Spanish | 1448 | 1422 | Claude Opus 4.1 |
| LMArena Text: Russian | 1422 | 1438 | GPT-6 Astra |
| LMArena Text: Polish | 1413 | 1422 | GPT-6 Astra |
| LMArena Text: multi-turn | 1444 | 1447 | GPT-6 Astra |
| LMArena Text: longer queries | 1455 | 1460 | GPT-6 Astra |
| LMArena Text: writing and language | 1418 | 1437 | GPT-6 Astra |
| LMArena Text: entertainment and media | 1398 | 1427 | GPT-6 Astra |
| LMArena Vision: English | Not measured | 1280 | Only GPT-6 Astra measured |
| LMArena Vision: Chinese | Not measured | 1361 | Only GPT-6 Astra measured |
| LMArena Vision: reading text | Not measured | 1292 | Only GPT-6 Astra measured |
| LMArena Vision: creative writing | Not measured | 1286 | Only GPT-6 Astra 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 4.1 | GPT-6 Astra | 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
GPT-6 Astra costs less
Repository review
50K input + 3K output tokens
GPT-6 Astra costs less
Agent loop
200K input + 10K output tokens
GPT-6 Astra 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 4.1 | OpenAI GPT-6 Astra |
|---|---|---|
| Maker | Anthropic | OpenAI |
| Weights | No public weights listed | No public weights listed |
| Released | August 5, 2025 | September 4, 2026 |
| Context window | 200K | 1.05M |
| Input $/Mtok | $15.00 | $10.00 |
| Output $/Mtok | $75.00 | $50.00 |
| Coding index | Not benchmarked | 85.1 |
| Independent measurements behind it | 1 | 5 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 4.1 better than GPT-6 Astra for coding?
Only GPT-6 Astra has a coding score, 85.1 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding. Pick Claude Opus 4.1 for work measured by LMArena Text: French or LMArena Text: Spanish, where it leads.
Which is cheaper, Claude Opus 4.1 or GPT-6 Astra?
Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. Cost per solved task is known for neither of them.
Which has the bigger context window, Claude Opus 4.1 or GPT-6 Astra?
GPT-6 Astra, with 1.05M tokens against 200K.
How many benchmarks is the Claude Opus 4.1 vs GPT-6 Astra comparison based on?
54 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and GPT-6 Astra's on 5. Where only one model has a result, the page says so instead of naming a winner.