DeepSeek V4.1 Flash vs Grok 4.3
Updated October 21, 2026. 76 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick DeepSeek V4.1 Flash for coding: it scores 77.2 on the Vibe Coding Index against 22.5 for Grok 4.3.
Pick Grok 4.3 when what matters is AA Intelligence Index or LegalBench (Vals AI), where it leads.
- Shared results
- 76
- DeepSeek V4.1 Flash only
- 25
- Grok 4.3 only
- 28
- Like-for-like categories
- 8 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, four public coding benchmarks
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash scores 77.2 against 22.5.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
Grok 4.3
Grok 4.3 leads, 24.9 against 24.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Grok 4.3 has a AA Agentic Index result, 15.5.
Directional only
Reasoning
GPQA Diamond
No call
Only Grok 4.3 has a GPQA Diamond result, 91.4%.
Directional only
Knowledge
MMLU Pro
No call
Only Grok 4.3 has a MMLU Pro result, 85.8%.
Directional only
Web design
Design Arena: websites
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash leads, 1309 against 1196.
Same board, both measured
Long documents
Listed context window
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash $0.0003, Grok 4.3 $0.0025 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Grok 4.3 has the number, $0.31.
Directional only
At a glance
- Coding index
- DeepSeek V4.1 Flash 77.2 from 2 benchmarks, Grok 4.3 22.5 from 1 benchmark.
- Widest category
- Coding, 27.5 points apart on average over 13 shared benchmarks.
- Widest single gap
- Vibe Code Bench (Vals AI): DeepSeek V4.1 Flash 84.7% against Grok 4.3 19.4%, 65.3 points apart on a 0 to 100 scale.
- Output price
- DeepSeek V4.1 Flash $0.525 against Grok 4.3 $2.50 per million output tokens, 4.8x apart.
- Context window
- DeepSeek V4.1 Flash takes 1.05M tokens, Grok 4.3 1M.
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 | Grok 4.3 | Ties |
|---|---|---|---|---|
| Coding | 13 | 0 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 4 | 0 | ||
| Reasoning | 8 | 0 | ||
| Math | 6 | 0 | ||
| Knowledge | 6 | 1 | ||
| Web design | 8 | 0 | ||
| General | 28 | 1 | ||
| All shared boards | 73 | 3 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index130
| Benchmark | DeepSeek V4.1 Flash | Grok 4.3 | Leader |
|---|---|---|---|
| LiveBench coding | 90.2% | Not measured | Only DeepSeek V4.1 Flash measured |
| LMArena WebDev | 1618 | 1358 | DeepSeek V4.1 Flash |
| AA Coding Index | Not measured | 42.2 | Only Grok 4.3 measured |
| LiveCodeBench (Vals AI) | Not measured | 84.5% | Only Grok 4.3 measured |
| SWE-bench Verified (Vals AI) | Not measured | 71.4% | Only Grok 4.3 measured |
| Terminal-Bench 4 (Vals AI) | 19.7% | Not measured | Only DeepSeek V4.1 Flash measured |
| Vibe Code Bench (Vals AI) | 84.7% | 19.4% | DeepSeek V4.1 Flash |
| Code migration (Vals AI) | 45.6% | 6.8% | DeepSeek V4.1 Flash |
| ProgramBench (Vals AI) | 0.5% | 0.0% | DeepSeek V4.1 Flash |
| IOI (Vals AI) | 40.3% | Not measured | Only DeepSeek V4.1 Flash measured |
| Terminal-Bench 2.1 (Vals AI) | 74.5% | 42.0% | DeepSeek V4.1 Flash |
| SWE-bench Multimodal (Vals AI) | 46.5% | Not measured | Only DeepSeek V4.1 Flash measured |
| Vibe Code Bench 1-100 (Vals AI) | 16.4% | Not measured | Only DeepSeek V4.1 Flash measured |
| SkillsBench (Vals AI) | 69.8% | 40.6% | DeepSeek V4.1 Flash |
| CyberBench (Vals AI) | 73.7% | Not measured | Only DeepSeek V4.1 Flash measured |
| SciCode | 51.9% | 48.3% | DeepSeek V4.1 Flash |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 37.9% | Only Grok 4.3 measured |
| FrontierCode | 43.9% | Not measured | Only DeepSeek V4.1 Flash measured |
| WeirdML | Not measured | 49.9% | Only Grok 4.3 measured |
| ALE-Bench | 1092.3 | 944.2 | DeepSeek V4.1 Flash |
| LMArena Text: coding | 1502 | 1415 | DeepSeek V4.1 Flash |
| LMArena Text: software and IT | 1496 | 1416 | DeepSeek V4.1 Flash |
| LMArena WebDev: React | 1628 | 1353 | DeepSeek V4.1 Flash |
| LMArena WebDev: HTML | 1612 | 1367 | DeepSeek V4.1 Flash |
| LMArena WebDev: from an image | 1606 | 1375 | DeepSeek V4.1 Flash |
| Neither model has a result on the other 13 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | DeepSeek V4.1 Flash | Grok 4.3 | Leader |
|---|---|---|---|
| AA Intelligence Index | 24.7 | 24.9 | Grok 4.3 |
| Epoch Capabilities Index | 155.9 | Not measured | Only DeepSeek V4.1 Flash measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | DeepSeek V4.1 Flash | Grok 4.3 | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 15.5 | Only Grok 4.3 measured |
| Design Arena: agents building web apps | Not measured | 1126 | Only Grok 4.3 measured |
| Design Arena: agents building full-stack apps | Not measured | 1006 | Only Grok 4.3 measured |
| Design Arena: agents building mobile apps | Not measured | 1059 | Only Grok 4.3 measured |
| Design Arena: agents building Android apps | Not measured | 967 | Only Grok 4.3 measured |
| Design Arena: agents building Godot games | Not measured | 914 | Only Grok 4.3 measured |
| Design Arena: agents building games | Not measured | 1007 | Only Grok 4.3 measured |
| Design Arena: HTML slides | Not measured | 1008 | Only Grok 4.3 measured |
| Design Arena: PowerPoint slides | Not measured | 1012 | Only Grok 4.3 measured |
| LiveBench research | 86.8% | Not measured | Only DeepSeek V4.1 Flash measured |
| LiveBench browser | 84.0% | Not measured | Only DeepSeek V4.1 Flash measured |
| LiveBench long agentic | 40.1% | Not measured | Only DeepSeek V4.1 Flash measured |
| SREBench (Vals AI) | 0.8% | Not measured | Only DeepSeek V4.1 Flash measured |
| Finance Agent (Vals AI) | 53.5% | 37.7% | DeepSeek V4.1 Flash |
| Tax Agent Bench (Vals AI) | 26.6% | 6.2% | DeepSeek V4.1 Flash |
| Legal Research Bench (Vals AI) | 41.4% | 15.4% | DeepSeek V4.1 Flash |
| Excel Modeling Benchmark (Vals AI) | 57.2% | 18.4% | DeepSeek V4.1 Flash |
| BioMysteryBench (Vals AI) | 67.8% | Not measured | Only DeepSeek V4.1 Flash measured |
| Terminal-Bench-Science (Vals AI) | 0.0% | Not measured | Only DeepSeek V4.1 Flash measured |
| Vals Science Index | 29.6% | Not measured | Only DeepSeek V4.1 Flash measured |
| τ²-Bench Telecom | Not measured | 97.7% | Only Grok 4.3 measured |
| APEX-Agents | 39.5% | Not measured | Only DeepSeek V4.1 Flash measured |
| Vending-Bench 2 | Not measured | $35 | Only Grok 4.3 measured |
| LMArena Search | Not measured | 1166 | Only Grok 4.3 measured |
| Neither model has a result on the other 15 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | DeepSeek V4.1 Flash | Grok 4.3 | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 91.4% | Only Grok 4.3 measured |
| LiveBench reasoning | 86.7% | Not measured | Only DeepSeek V4.1 Flash measured |
| MysteryMechanism (Vals AI) | 21.2% | Not measured | Only DeepSeek V4.1 Flash measured |
| MMMU Pro (Vals AI) | Not measured | 83.1% | Only Grok 4.3 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 90.1% | Only Grok 4.3 measured |
| Humanity's Last Exam (Artificial Analysis run) | 39.2% | 37.2% | DeepSeek V4.1 Flash |
| GPQA Diamond (Epoch AI run) | 89.8% | 88.8% | DeepSeek V4.1 Flash |
| ARC-AGI | 94.5% | Not measured | Only DeepSeek V4.1 Flash measured |
| ARC-AGI-2 | 72.9% | Not measured | Only DeepSeek V4.1 Flash measured |
| Chess puzzles | 48.0% | 18.0% | DeepSeek V4.1 Flash |
| Mystery game puzzles | 43.0% | Not measured | Only DeepSeek V4.1 Flash measured |
| LMArena Text: hard prompts | 1483 | 1396 | DeepSeek V4.1 Flash |
| LMArena Text: expert | 1501 | 1384 | DeepSeek V4.1 Flash |
| LMArena Text: hard prompts in English | 1488 | 1402 | DeepSeek V4.1 Flash |
| LMArena Vision: diagrams | 1297 | 1241 | DeepSeek V4.1 Flash |
| LMArena Vision: homework | 1307 | 1241 | DeepSeek V4.1 Flash |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | DeepSeek V4.1 Flash | Grok 4.3 | Leader |
|---|---|---|---|
| OTIS Mock AIME | 98.3% | 93.3% | DeepSeek V4.1 Flash |
| FrontierMath, tiers 1 to 3 | 67.4% | 42.8% | DeepSeek V4.1 Flash |
| FrontierMath, tier 4 | 26.8% | 14.6% | DeepSeek V4.1 Flash |
| ProofBench | 54.0% | 11.0% | DeepSeek V4.1 Flash |
| LMArena Text: math | 1478 | 1387 | DeepSeek V4.1 Flash |
| LMArena Text: mathematical work | 1485 | 1396 | DeepSeek V4.1 Flash |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index61
| Benchmark | DeepSeek V4.1 Flash | Grok 4.3 | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 85.8% | Only Grok 4.3 measured |
| LegalBench (Vals AI) | 83.3% | 84.5% | Grok 4.3 |
| CaseLaw (Vals AI) | Not measured | 79.3% | Only Grok 4.3 measured |
| CorpFin (Vals AI) | Not measured | 68.5% | Only Grok 4.3 measured |
| TaxEval (Vals AI) | Not measured | 70.8% | Only Grok 4.3 measured |
| MortgageTax (Vals AI) | Not measured | 48.3% | Only Grok 4.3 measured |
| MedCode (Vals AI) | 41.2% | 38.1% | DeepSeek V4.1 Flash |
| SimpleQA Verified | 42.9% | 33.2% | DeepSeek V4.1 Flash |
| LMArena Text: science | 1469 | 1399 | DeepSeek V4.1 Flash |
| LMArena Text: medicine and healthcare | 1484 | 1384 | DeepSeek V4.1 Flash |
| LMArena Text: legal and government | 1443 | 1386 | DeepSeek V4.1 Flash |
| LMArena Text: business and finance | 1461 | 1381 | DeepSeek V4.1 Flash |
| Neither model has a result on the other 5 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | DeepSeek V4.1 Flash | Grok 4.3 | Leader |
|---|---|---|---|
| Design Arena: websites | 1309 | 1196 | DeepSeek V4.1 Flash |
| Design Arena: UI components | 1314 | 1192 | DeepSeek V4.1 Flash |
| Design Arena: game dev | 1331 | 1174 | DeepSeek V4.1 Flash |
| Design Arena: data viz | 1290 | 1180 | DeepSeek V4.1 Flash |
| Design Arena: 3D | 1356 | 1125 | DeepSeek V4.1 Flash |
| Design Arena: all code categories | 1320 | 1187 | DeepSeek V4.1 Flash |
| Design Arena: SVG | 1243 | 1081 | DeepSeek V4.1 Flash |
| Design Arena: ASCII art | 1265 | 1125 | DeepSeek V4.1 Flash |
| LiveBench design | 79.2% | Not measured | Only DeepSeek V4.1 Flash measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index281
| Benchmark | DeepSeek V4.1 Flash | Grok 4.3 | Leader |
|---|---|---|---|
| LiveBench data analysis | 79.3% | Not measured | Only DeepSeek V4.1 Flash measured |
| Public Benefits Bench (Vals AI) | 64.3% | 51.7% | DeepSeek V4.1 Flash |
| SAGE (Vals AI) | 47.9% | 19.7% | DeepSeek V4.1 Flash |
| MedScribe (Vals AI) | 85.5% | 74.4% | DeepSeek V4.1 Flash |
| Vals Multimodal Index | Not measured | 43.3% | Only Grok 4.3 measured |
| IFBench | Not measured | 83.3% | Only Grok 4.3 measured |
| Long context reasoning (AA-LCR) | 84.0% | 75.0% | DeepSeek V4.1 Flash |
| DTBench | 89.9% | 90.7% | Grok 4.3 |
| LMCA | 47.0% | 38.3% | DeepSeek V4.1 Flash |
| Surface Evolver Bench | 46.3% | Not measured | Only DeepSeek V4.1 Flash measured |
| Furniture assembly | 34.2% | Not measured | Only DeepSeek V4.1 Flash measured |
| LMArena Text | 1464 | 1397 | DeepSeek V4.1 Flash |
| LMArena Text: instruction following | 1473 | 1366 | DeepSeek V4.1 Flash |
| LMArena Text: creative writing | 1437 | 1380 | DeepSeek V4.1 Flash |
| LMArena Vision | 1278 | 1229 | DeepSeek V4.1 Flash |
| LMArena Text: English | 1473 | 1404 | DeepSeek V4.1 Flash |
| LMArena Text: non-English | 1449 | 1385 | DeepSeek V4.1 Flash |
| LMArena Text: Chinese | 1501 | 1422 | DeepSeek V4.1 Flash |
| LMArena Text: German | 1470 | 1395 | DeepSeek V4.1 Flash |
| LMArena Text: Japanese | 1432 | 1379 | DeepSeek V4.1 Flash |
| LMArena Text: Korean | 1436 | 1354 | DeepSeek V4.1 Flash |
| LMArena Text: French | 1465 | 1411 | DeepSeek V4.1 Flash |
| LMArena Text: Spanish | 1459 | 1399 | DeepSeek V4.1 Flash |
| LMArena Text: Russian | 1467 | 1399 | DeepSeek V4.1 Flash |
| LMArena Text: Polish | 1457 | 1398 | DeepSeek V4.1 Flash |
| LMArena Text: multi-turn | 1461 | 1406 | DeepSeek V4.1 Flash |
| LMArena Text: longer queries | 1473 | 1393 | DeepSeek V4.1 Flash |
| LMArena Text: writing and language | 1450 | 1385 | DeepSeek V4.1 Flash |
| LMArena Text: entertainment and media | 1445 | 1370 | DeepSeek V4.1 Flash |
| LMArena Vision: English | 1288 | 1235 | DeepSeek V4.1 Flash |
| LMArena Vision: Chinese | 1327 | 1257 | DeepSeek V4.1 Flash |
| LMArena Vision: reading text | 1282 | 1235 | DeepSeek V4.1 Flash |
| LMArena Vision: humor | 1260 | 1222 | DeepSeek V4.1 Flash |
| LMArena Vision: recognizing things | Not measured | 1217 | Only Grok 4.3 measured |
| LMArena Vision: creative writing | 1275 | 1237 | DeepSeek V4.1 Flash |
| 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 | DeepSeek V4.1 Flash | Grok 4.3 | 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 | SpaceXAI Grok 4.3 |
|---|---|---|
| Maker | DeepSeek | xAI |
| Weights | Open weights | No public weights listed |
| Released | September 10, 2026 | April 30, 2026 |
| Context window | 1.05M | 1M |
| Input $/Mtok | $0.049 | $1.25 |
| Output $/Mtok | $0.525 | $2.50 |
| Coding index | 77.2 | 22.5 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | Not computable | $0.31 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is DeepSeek V4.1 Flash better than Grok 4.3 for coding?
Pick DeepSeek V4.1 Flash for coding: it scores 77.2 on the Vibe Coding Index against 22.5 for Grok 4.3. Pick Grok 4.3 when what matters is AA Intelligence Index or LegalBench (Vals AI), where it leads.
Which is cheaper, DeepSeek V4.1 Flash or Grok 4.3?
DeepSeek V4.1 Flash costs $0.049 per million input tokens and $0.525 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Cost per solved task is known for Grok 4.3 only.
Which has the bigger context window, DeepSeek V4.1 Flash or Grok 4.3?
DeepSeek V4.1 Flash, with 1.05M tokens against 1M.
How many benchmarks is the DeepSeek V4.1 Flash vs Grok 4.3 comparison based on?
76 benchmarks have a result for both models as of October 21, 2026. DeepSeek V4.1 Flash's coding index rests on 2 independent benchmarks and Grok 4.3's on 1. Where only one model has a result, the page says so instead of naming a winner.