DeepSeek V4.1 Flash vs GPT-6 Astra
GPT-6 Astra leads DeepSeek V4.1 Flash on coding, 85.1 to 62.5 on the Vibe Coding Index, and DeepSeek V4.1 Flash costs 59.5x less per output token ($0.84 vs $50.00 per million). Updated October 22, 2026; 97 benchmarks have a result for both.
DeepSeek V4.1 Flash or GPT-6 Astra: which to pick
Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 62.5 for DeepSeek V4.1 Flash.
Pick DeepSeek V4.1 Flash for output tokens 59.5x cheaper ($0.84 vs $50.00 per million) and work measured by SWE-bench Multimodal (Vals AI) or CyberBench (Vals AI), where it leads.
- Shared results
- 97
- DeepSeek V4.1 Flash only
- 5
- GPT-6 Astra only
- 32
- Like-for-like categories
- 8 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
GPT-6 Astra
GPT-6 Astra scores 85.1 against 62.5.
5 benchmarks behind each score
Intelligence
AA Intelligence Index
GPT-6 Astra
GPT-6 Astra leads, 52.7 against 24.7.
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
Web design
Design Arena: websites
GPT-6 Astra
GPT-6 Astra leads, 1336 against 1308.
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 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash $0.0006, GPT-6 Astra $0.035 per turn.
List prices
At a glance
- Coding index
- DeepSeek V4.1 Flash 62.5 from 5 benchmarks, GPT-6 Astra 85.1 from 5 benchmarks.
- Widest category
- Math, 26.5 points apart on average over 7 shared benchmarks.
- Widest single gap
- FrontierMath, tier 4: DeepSeek V4.1 Flash 26.8% against GPT-6 Astra 97.6%, 70.8 points apart on a 0 to 100 scale.
- Output price
- DeepSeek V4.1 Flash $0.84 against GPT-6 Astra $50.00 per million output tokens, 59.5x apart.
- Context window
- DeepSeek V4.1 Flash takes 1.05M 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 | DeepSeek V4.1 Flash | Bars | GPT-6 Astra | Ties |
|---|---|---|---|---|
| Coding | 4 | 15 | ||
| Intelligence | 0 | 2 | ||
| Agentic work | 3 | 8 | 1 tie | |
| Reasoning | 3 | 10 | ||
| Math | 2 | 5 | ||
| Knowledge | 3 | 3 | ||
| Web design | 0 | 9 | ||
| General | 20 | 9 | ||
| All shared boards | 35 | 61 | 1 tie |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index415
| Benchmark | DeepSeek V4.1 Flash | GPT-6 Astra | Leader |
|---|---|---|---|
| LiveBench coding | 90.2% | 93.7% | GPT-6 Astra |
| LMArena WebDev | 1618 | 1774 | GPT-6 Astra |
| AA Coding Index | Not measured | 76.9 | Only GPT-6 Astra measured |
| Terminal-Bench 4 (Vals AI) | 19.7% | 59.6% | GPT-6 Astra |
| Vibe Code Bench (Vals AI) | 84.7% | 89.6% | GPT-6 Astra |
| Code migration (Vals AI) | 45.6% | 67.7% | GPT-6 Astra |
| ProgramBench (Vals AI) | 0.5% | 5.5% | GPT-6 Astra |
| IOI (Vals AI) | 40.3% | 100.0% | GPT-6 Astra |
| Terminal-Bench 2.1 (Vals AI) | 74.5% | 87.3% | GPT-6 Astra |
| SWE-bench Multimodal (Vals AI) | 46.5% | 43.3% | DeepSeek V4.1 Flash |
| Vibe Code Bench 1-100 (Vals AI) | 16.4% | 27.6% | GPT-6 Astra |
| SkillsBench (Vals AI) | 69.8% | Not measured | Only DeepSeek V4.1 Flash measured |
| CyberBench (Vals AI) | 73.7% | 41.1% | DeepSeek V4.1 Flash |
| SciCode | 51.9% | 56.5% | GPT-6 Astra |
| FrontierCode | 43.9% | 53.3% | GPT-6 Astra |
| FrontierSWE | Not measured | 65.5% | Only GPT-6 Astra measured |
| GSO-Bench | Not measured | 79.4% | Only GPT-6 Astra measured |
| WeirdML | Not measured | 93.3% | Only GPT-6 Astra measured |
| MirrorCode | Not measured | 46.7% | Only GPT-6 Astra measured |
| ALE-Bench | 1092.3 | 2951.3 | GPT-6 Astra |
| LMArena Text: coding | 1502 | 1489 | DeepSeek V4.1 Flash |
| LMArena Text: software and IT | 1496 | 1474 | DeepSeek V4.1 Flash |
| LMArena WebDev: React | 1628 | 1798 | GPT-6 Astra |
| LMArena WebDev: HTML | 1612 | 1775 | GPT-6 Astra |
| LMArena WebDev: from an image | 1606 | 1726 | GPT-6 Astra |
| SciCode | Not measured | 12.3% | Only GPT-6 Astra measured |
| SWE-Bench Pro V2 | Not measured | 96.9% | Only GPT-6 Astra measured |
| SWE Atlas: Codebase QnA | Not measured | 59.1% | Only GPT-6 Astra measured |
| SWE Atlas: Refactoring | Not measured | 59.1% | Only GPT-6 Astra measured |
| SWE Atlas: Test Writing | Not measured | 50.7% | Only GPT-6 Astra measured |
| Neither model has a result on the other 13 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | DeepSeek V4.1 Flash | GPT-6 Astra | Leader |
|---|---|---|---|
| AA Intelligence Index | 24.7 | 52.7 | GPT-6 Astra |
| Epoch Capabilities Index | 155.9 | 168.8 | GPT-6 Astra |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index38
| Benchmark | DeepSeek V4.1 Flash | GPT-6 Astra | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 51.0 | Only GPT-6 Astra measured |
| Design Arena: agents building web apps | Not measured | 1374 | 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 | 1217 | Only GPT-6 Astra measured |
| Design Arena: spreadsheets | Not measured | 1378 | Only GPT-6 Astra measured |
| LiveBench research | 86.8% | 85.2% | DeepSeek V4.1 Flash |
| LiveBench browser | 84.0% | 84.0% | Tie |
| LiveBench long agentic | 40.1% | 82.4% | GPT-6 Astra |
| SREBench (Vals AI) | 0.8% | 56.9% | GPT-6 Astra |
| Finance Agent (Vals AI) | 53.5% | 53.5% | GPT-6 Astra |
| Tax Agent Bench (Vals AI) | 26.6% | 20.7% | DeepSeek V4.1 Flash |
| Legal Research Bench (Vals AI) | 41.4% | 39.4% | DeepSeek V4.1 Flash |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 7.1% | Only GPT-6 Astra measured |
| Excel Modeling Benchmark (Vals AI) | 57.2% | 71.7% | GPT-6 Astra |
| BioMysteryBench (Vals AI) | 67.8% | 79.3% | GPT-6 Astra |
| Terminal-Bench-Science (Vals AI) | 0.0% | 62.9% | GPT-6 Astra |
| Vals Science Index | 29.6% | 65.1% | GPT-6 Astra |
| 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 | 39.5% | 64.7% | GPT-6 Astra |
| Remote Labor Index | Not measured | 20.8% | Only GPT-6 Astra measured |
| BALROG | Not measured | 68.3% | Only GPT-6 Astra 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 15 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index310
| Benchmark | DeepSeek V4.1 Flash | GPT-6 Astra | Leader |
|---|---|---|---|
| LiveBench reasoning | 86.7% | 92.7% | GPT-6 Astra |
| MysteryMechanism (Vals AI) | 21.2% | 53.1% | GPT-6 Astra |
| GPQA Diamond (Artificial Analysis run) | Not measured | 96.3% | Only GPT-6 Astra measured |
| Humanity's Last Exam (Artificial Analysis run) | 39.2% | 54.7% | GPT-6 Astra |
| GPQA Diamond (Epoch AI run) | 89.8% | 95.8% | GPT-6 Astra |
| ARC-AGI | 94.5% | 98.5% | GPT-6 Astra |
| ARC-AGI-2 | 72.9% | 95.0% | GPT-6 Astra |
| Chess puzzles | 48.0% | 74.0% | GPT-6 Astra |
| Mystery game puzzles | 43.0% | 84.0% | GPT-6 Astra |
| EBR-bench | Not measured | 76.2% | Only GPT-6 Astra measured |
| LMArena Text: hard prompts | 1483 | 1463 | DeepSeek V4.1 Flash |
| LMArena Text: expert | 1501 | 1489 | DeepSeek V4.1 Flash |
| LMArena Text: hard prompts in English | 1488 | 1464 | DeepSeek V4.1 Flash |
| LMArena Vision: diagrams | 1297 | 1297 | GPT-6 Astra |
| LMArena Vision: homework | 1307 | 1337 | GPT-6 Astra |
| Humanity's Last Exam (Scale run) | Not measured | 60.6% | Only GPT-6 Astra measured |
| Neither model has a result on the other 7 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index25
| Benchmark | DeepSeek V4.1 Flash | GPT-6 Astra | Leader |
|---|---|---|---|
| OTIS Mock AIME | 98.3% | 100.0% | GPT-6 Astra |
| FrontierMath, tiers 1 to 3 | 67.4% | 93.7% | GPT-6 Astra |
| FrontierMath, tier 4 | 26.8% | 97.6% | GPT-6 Astra |
| ProofBench | 54.0% | 99.0% | GPT-6 Astra |
| LMArena Text: math | 1478 | 1465 | DeepSeek V4.1 Flash |
| LMArena Text: mathematical work | 1485 | 1484 | DeepSeek V4.1 Flash |
| MathArena | 42.3% | 81.9% | GPT-6 Astra |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index33
| Benchmark | DeepSeek V4.1 Flash | GPT-6 Astra | Leader |
|---|---|---|---|
| LegalBench (Vals AI) | 83.3% | Not measured | Only DeepSeek V4.1 Flash measured |
| MedCode (Vals AI) | 41.2% | 48.5% | GPT-6 Astra |
| SimpleQA Verified | 42.9% | 75.6% | GPT-6 Astra |
| LMArena Text: science | 1469 | 1451 | DeepSeek V4.1 Flash |
| LMArena Text: medicine and healthcare | 1484 | 1425 | DeepSeek V4.1 Flash |
| LMArena Text: legal and government | 1443 | 1462 | GPT-6 Astra |
| LMArena Text: business and finance | 1461 | 1439 | DeepSeek V4.1 Flash |
| FACTS Benchmark Suite | Not measured | 75.7% | Only GPT-6 Astra measured |
| PRBench Finance | Not measured | 47.5% | Only GPT-6 Astra measured |
| PRBench Legal | Not measured | 48.4% | Only GPT-6 Astra measured |
| Neither model has a result on the other 10 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index09
| Benchmark | DeepSeek V4.1 Flash | GPT-6 Astra | Leader |
|---|---|---|---|
| Design Arena: websites | 1308 | 1336 | GPT-6 Astra |
| Design Arena: UI components | 1312 | 1394 | GPT-6 Astra |
| Design Arena: game dev | 1330 | 1480 | GPT-6 Astra |
| Design Arena: data viz | 1291 | 1334 | GPT-6 Astra |
| Design Arena: 3D | 1355 | 1500 | GPT-6 Astra |
| Design Arena: all code categories | 1319 | 1379 | GPT-6 Astra |
| Design Arena: SVG | 1244 | 1430 | GPT-6 Astra |
| Design Arena: ASCII art | 1265 | 1353 | GPT-6 Astra |
| LiveBench design | 79.2% | 82.0% | GPT-6 Astra |
GeneralLike-for-likePublic boards, shown as published, kept out of the index209
| Benchmark | DeepSeek V4.1 Flash | GPT-6 Astra | Leader |
|---|---|---|---|
| Vals Index | Not measured | 65.0% | Only GPT-6 Astra measured |
| LiveBench data analysis | 79.3% | 83.0% | GPT-6 Astra |
| Public Benefits Bench (Vals AI) | 64.3% | Not measured | Only DeepSeek V4.1 Flash measured |
| SAGE (Vals AI) | 47.9% | 46.4% | DeepSeek V4.1 Flash |
| MedScribe (Vals AI) | 85.5% | 87.9% | GPT-6 Astra |
| Long context reasoning (AA-LCR) | 84.0% | 80.7% | DeepSeek V4.1 Flash |
| DTBench | 89.9% | 97.3% | GPT-6 Astra |
| LMCA | 47.0% | 64.4% | GPT-6 Astra |
| Surface Evolver Bench | 46.3% | Not measured | Only DeepSeek V4.1 Flash measured |
| Furniture assembly | 34.2% | 80.0% | GPT-6 Astra |
| LMArena Text | 1464 | 1441 | DeepSeek V4.1 Flash |
| LMArena Text: instruction following | 1473 | 1455 | DeepSeek V4.1 Flash |
| LMArena Text: creative writing | 1437 | 1420 | DeepSeek V4.1 Flash |
| LMArena Vision | 1278 | 1280 | GPT-6 Astra |
| LMArena Text: English | 1473 | 1447 | DeepSeek V4.1 Flash |
| LMArena Text: non-English | 1449 | 1432 | DeepSeek V4.1 Flash |
| LMArena Text: Chinese | 1501 | 1489 | DeepSeek V4.1 Flash |
| LMArena Text: German | 1470 | 1459 | DeepSeek V4.1 Flash |
| LMArena Text: Japanese | 1432 | 1405 | DeepSeek V4.1 Flash |
| LMArena Text: Korean | 1436 | 1428 | DeepSeek V4.1 Flash |
| LMArena Text: French | 1465 | 1432 | DeepSeek V4.1 Flash |
| LMArena Text: Spanish | 1459 | 1422 | DeepSeek V4.1 Flash |
| LMArena Text: Russian | 1467 | 1438 | DeepSeek V4.1 Flash |
| LMArena Text: Polish | 1457 | 1422 | DeepSeek V4.1 Flash |
| LMArena Text: multi-turn | 1461 | 1447 | DeepSeek V4.1 Flash |
| LMArena Text: longer queries | 1473 | 1460 | DeepSeek V4.1 Flash |
| LMArena Text: writing and language | 1450 | 1437 | DeepSeek V4.1 Flash |
| LMArena Text: entertainment and media | 1445 | 1427 | DeepSeek V4.1 Flash |
| LMArena Vision: English | 1288 | 1280 | DeepSeek V4.1 Flash |
| LMArena Vision: Chinese | 1327 | 1361 | GPT-6 Astra |
| LMArena Vision: reading text | 1282 | 1292 | GPT-6 Astra |
| LMArena Vision: humor | 1260 | Not measured | Only DeepSeek V4.1 Flash measured |
| LMArena Vision: creative writing | 1275 | 1286 | GPT-6 Astra |
| 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 | DeepSeek V4.1 Flash | 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
DeepSeek V4.1 Flash costs less
Repository review
50K input + 3K output tokens
DeepSeek V4.1 Flash costs less
Agent loop
200K input + 10K output tokens
DeepSeek V4.1 Flash 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 | DeepSeek V4.1 Flash | OpenAI GPT-6 Astra |
|---|---|---|
| Maker | DeepSeek | OpenAI |
| Weights | Open weights | No public weights listed |
| Released | September 10, 2026 | September 4, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $0.21 | $10.00 |
| Output $/Mtok | $0.84 | $50.00 |
| Coding index | 62.5 | 85.1 |
| Independent measurements behind it | 5 | 5 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is DeepSeek V4.1 Flash better than GPT-6 Astra for coding?
Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 62.5 for DeepSeek V4.1 Flash. Pick DeepSeek V4.1 Flash for output tokens 59.5x cheaper ($0.84 vs $50.00 per million) and work measured by SWE-bench Multimodal (Vals AI) or CyberBench (Vals AI), where it leads.
Which is cheaper, DeepSeek V4.1 Flash or GPT-6 Astra?
DeepSeek V4.1 Flash costs $0.21 per million input tokens and $0.84 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, DeepSeek V4.1 Flash or GPT-6 Astra?
GPT-6 Astra, with 1.05M tokens against 1.05M.
How many benchmarks is the DeepSeek V4.1 Flash vs GPT-6 Astra comparison based on?
97 benchmarks have a result for both models as of October 22, 2026. DeepSeek V4.1 Flash's coding index rests on 5 independent benchmarks and GPT-6 Astra's on 5. Where only one model has a result, the page says so instead of naming a winner.