DeepSeek V4 Flash 0423 vs o3
DeepSeek V4 Flash 0423 leads o3 on the Artificial Analysis Intelligence Index, 24.4 to 20.2, and DeepSeek V4 Flash 0423 costs 28.6x less per output token ($0.28 vs $8.00 per million). Updated October 21, 2026; 41 benchmarks have a result for both.
DeepSeek V4 Flash 0423 or o3: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick DeepSeek V4 Flash 0423 for output tokens 28.6x cheaper ($0.28 vs $8.00 per million) and a larger context window (1.05M against 200K tokens).
- Shared results
- 41
- DeepSeek V4 Flash 0423 only
- 8
- o3 only
- 61
- 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
Neither has a coding score yet.
One side not measured
Intelligence
AA Intelligence Index
DeepSeek V4 Flash 0423
DeepSeek V4 Flash 0423 leads, 24.4 against 20.2.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only DeepSeek V4 Flash 0423 has a AA Agentic Index result, 26.3.
Directional only
Reasoning
GPQA Diamond
No call
Only o3 has a GPQA Diamond result, 84.1%.
Directional only
Math
AIME
No call
Only o3 has a AIME result, 85.3%.
Directional only
Knowledge
MMLU Pro
No call
Only o3 has a MMLU Pro result, 85.6%.
Directional only
Web design
Design Arena: websites
DeepSeek V4 Flash 0423
DeepSeek V4 Flash 0423 leads, 1208 against 1036.
Same board, both measured
Long documents
Listed context window
DeepSeek V4 Flash 0423
DeepSeek V4 Flash 0423 takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
DeepSeek V4 Flash 0423
DeepSeek V4 Flash 0423 $0.0003, o3 $0.0060 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only o3 has the number, $0.571.
Directional only
At a glance
- Coding index
- DeepSeek V4 Flash 0423 not benchmarked, o3 not benchmarked.
- Widest category
- Web design, 18.5 points apart on average over 5 shared benchmarks.
- Widest single gap
- Design Arena: all code categories: DeepSeek V4 Flash 0423 1205 against o3 1020, 23.1 points apart on a 0 to 100 scale.
- Output price
- DeepSeek V4 Flash 0423 $0.28 against o3 $8.00 per million output tokens, 28.6x apart.
- Context window
- DeepSeek V4 Flash 0423 takes 1.05M tokens, o3 200K.
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 Flash 0423 | Bars | o3 | Ties |
|---|---|---|---|---|
| Coding | 2 | 2 | ||
| Intelligence | 1 | 1 | ||
| Reasoning | 3 | 2 | ||
| Math | 1 | 1 | ||
| Knowledge | 4 | 0 | ||
| Web design | 4 | 1 | ||
| General | 15 | 4 | ||
| All shared boards | 30 | 11 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index22
| Benchmark | DeepSeek V4 Flash 0423 | o3 | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 81.3% | Only o3 measured |
| SWE-bench Verified | Not measured | 58.4% | Only o3 measured |
| SWE-bench Multimodal | Not measured | 36.0% | Only o3 measured |
| LMArena WebDev | 1582 | Not measured | Only DeepSeek V4 Flash 0423 measured |
| AA Coding Index | 52.0 | Not measured | Only DeepSeek V4 Flash 0423 measured |
| LiveCodeBench (Vals AI) | Not measured | 83.9% | Only o3 measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 80.8% | Only o3 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 37.1% | Only o3 measured |
| GSO-Bench | Not measured | 8.8% | Only o3 measured |
| WeirdML | 45.6% | 52.4% | o3 |
| ALE-Bench | 678.2 | 933.5 | o3 |
| LMArena Text: coding | 1457 | 1407 | DeepSeek V4 Flash 0423 |
| LMArena Text: software and IT | 1453 | 1415 | DeepSeek V4 Flash 0423 |
| LMArena WebDev: React | 1585 | Not measured | Only DeepSeek V4 Flash 0423 measured |
| LMArena WebDev: HTML | 1558 | Not measured | Only DeepSeek V4 Flash 0423 measured |
| SciCode | Not measured | 9.2% | Only o3 measured |
| Neither model has a result on the other 23 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
| Benchmark | DeepSeek V4 Flash 0423 | o3 | Leader |
|---|---|---|---|
| AA Intelligence Index | 24.4 | 20.2 | DeepSeek V4 Flash 0423 |
| Epoch Capabilities Index | 146.1 | 146.7 | o3 |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | DeepSeek V4 Flash 0423 | o3 | Leader |
|---|---|---|---|
| AA Agentic Index | 26.3 | Not measured | Only DeepSeek V4 Flash 0423 measured |
| τ²-Bench Telecom | Not measured | 80.7% | Only o3 measured |
| METR time horizons | Not measured | 65.4% | Only o3 measured |
| GDPval | Not measured | 30.8% | Only o3 measured |
| DeepResearch Bench | Not measured | 45.2% | Only o3 measured |
| OSWorld | Not measured | 23.0% | Only o3 measured |
| Berkeley Function Calling Leaderboard (BFCL) | Not measured | 63.0% | Only o3 measured |
| BrowseComp-Plus | Not measured | 65.9% | Only o3 measured |
| Neither model has a result on the other 33 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index32
| Benchmark | DeepSeek V4 Flash 0423 | o3 | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 84.1% | Only o3 measured |
| MMMU Pro (Vals AI) | Not measured | 80.4% | Only o3 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 82.7% | Only o3 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 20.1% | Only o3 measured |
| GPQA Diamond (Epoch AI run) | Not measured | 81.8% | Only o3 measured |
| ARC-AGI | Not measured | 60.8% | Only o3 measured |
| ARC-AGI-2 | Not measured | 6.5% | Only o3 measured |
| SimpleBench | 46.3% | 53.1% | o3 |
| Chess puzzles | Not measured | 37.0% | Only o3 measured |
| Mystery game puzzles | Not measured | 29.0% | Only o3 measured |
| VPCT | Not measured | 52.0% | Only o3 measured |
| LMArena Text: hard prompts | 1444 | 1402 | DeepSeek V4 Flash 0423 |
| LMArena Text: expert | 1441 | 1402 | DeepSeek V4 Flash 0423 |
| LMArena Text: hard prompts in English | 1449 | 1411 | DeepSeek V4 Flash 0423 |
| LMArena Vision: diagrams | Not measured | 1220 | Only o3 measured |
| LMArena Vision: homework | Not measured | 1234 | Only o3 measured |
| Kagi LLM Benchmark | 52.2% | 67.6% | o3 |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index11
| Benchmark | DeepSeek V4 Flash 0423 | o3 | Leader |
|---|---|---|---|
| AIME | Not measured | 85.3% | Only o3 measured |
| MATH 500 (Vals AI) | Not measured | 94.6% | Only o3 measured |
| MGSM (Vals AI) | Not measured | 91.8% | Only o3 measured |
| AA Math Index | Not measured | 88.3 | Only o3 measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 88.3% | Only o3 measured |
| OTIS Mock AIME | Not measured | 84.4% | Only o3 measured |
| FrontierMath, tiers 1 to 3 | Not measured | 33.3% | Only o3 measured |
| MATH level 5 | Not measured | 97.8% | Only o3 measured |
| LMArena Text: math | 1426 | 1426 | o3 |
| LMArena Text: mathematical work | 1432 | 1423 | DeepSeek V4 Flash 0423 |
| Neither model has a result on the other 3 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | DeepSeek V4 Flash 0423 | o3 | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 85.6% | Only o3 measured |
| LegalBench (Vals AI) | Not measured | 83.8% | Only o3 measured |
| CorpFin (Vals AI) | Not measured | 59.7% | Only o3 measured |
| TaxEval (Vals AI) | Not measured | 74.6% | Only o3 measured |
| MortgageTax (Vals AI) | Not measured | 65.7% | Only o3 measured |
| MedQA (Vals AI) | Not measured | 96.1% | Only o3 measured |
| MedCode (Vals AI) | Not measured | 47.3% | Only o3 measured |
| MMLU Pro (Artificial Analysis run) | Not measured | 85.3% | Only o3 measured |
| SimpleQA Verified | Not measured | 49.4% | Only o3 measured |
| GeoBench | Not measured | 74.0% | Only o3 measured |
| LMArena Text: science | 1446 | 1429 | DeepSeek V4 Flash 0423 |
| LMArena Text: medicine and healthcare | 1448 | 1448 | DeepSeek V4 Flash 0423 |
| LMArena Text: legal and government | 1439 | 1428 | DeepSeek V4 Flash 0423 |
| LMArena Text: business and finance | 1425 | 1393 | DeepSeek V4 Flash 0423 |
| FACTS Benchmark Suite | Not measured | 44.4% | Only o3 measured |
| Neither model has a result on the other 3 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index41
| Benchmark | DeepSeek V4 Flash 0423 | o3 | Leader |
|---|---|---|---|
| Design Arena: websites | 1208 | 1036 | DeepSeek V4 Flash 0423 |
| Design Arena: UI components | 1165 | 1017 | DeepSeek V4 Flash 0423 |
| Design Arena: game dev | 1197 | 1034 | DeepSeek V4 Flash 0423 |
| Design Arena: data viz | 1127 | 1200 | o3 |
| Design Arena: 3D | 1189 | Not measured | Only DeepSeek V4 Flash 0423 measured |
| Design Arena: all code categories | 1205 | 1020 | DeepSeek V4 Flash 0423 |
| Design Arena: SVG | 1155 | Not measured | Only DeepSeek V4 Flash 0423 measured |
| Design Arena: ASCII art | 1109 | Not measured | Only DeepSeek V4 Flash 0423 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index154
| Benchmark | DeepSeek V4 Flash 0423 | o3 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | Not measured | 41.8% | Only o3 measured |
| MedScribe (Vals AI) | Not measured | 76.7% | Only o3 measured |
| IFBench | Not measured | 71.4% | Only o3 measured |
| Long context reasoning (AA-LCR) | Not measured | 74.7% | Only o3 measured |
| DTBench | 86.4% | 84.8% | DeepSeek V4 Flash 0423 |
| LMCA | 35.9% | 39.7% | o3 |
| Fiction.LiveBench | Not measured | 88.9% | Only o3 measured |
| Creative writing (Lech Mazur) | Not measured | 83.9% | Only o3 measured |
| CL-bench | Not measured | 17.8% | Only o3 measured |
| LMArena Text | 1432 | 1410 | DeepSeek V4 Flash 0423 |
| LMArena Text: instruction following | 1421 | 1368 | DeepSeek V4 Flash 0423 |
| LMArena Text: creative writing | 1403 | 1359 | DeepSeek V4 Flash 0423 |
| LMArena Vision | Not measured | 1214 | Only o3 measured |
| LMArena Text: English | 1441 | 1417 | DeepSeek V4 Flash 0423 |
| LMArena Text: non-English | 1419 | 1401 | DeepSeek V4 Flash 0423 |
| LMArena Text: Chinese | 1463 | 1437 | DeepSeek V4 Flash 0423 |
| LMArena Text: German | 1419 | 1420 | o3 |
| LMArena Text: Japanese | 1389 | 1403 | o3 |
| LMArena Text: Korean | 1383 | 1370 | DeepSeek V4 Flash 0423 |
| LMArena Text: French | 1439 | 1430 | DeepSeek V4 Flash 0423 |
| LMArena Text: Spanish | 1436 | 1395 | DeepSeek V4 Flash 0423 |
| LMArena Text: Russian | 1427 | 1406 | DeepSeek V4 Flash 0423 |
| LMArena Text: Polish | 1436 | 1438 | o3 |
| LMArena Text: multi-turn | 1449 | 1405 | DeepSeek V4 Flash 0423 |
| LMArena Text: longer queries | 1434 | 1372 | DeepSeek V4 Flash 0423 |
| LMArena Text: writing and language | 1410 | 1372 | DeepSeek V4 Flash 0423 |
| LMArena Text: entertainment and media | 1400 | 1373 | DeepSeek V4 Flash 0423 |
| LMArena Vision: English | Not measured | 1221 | Only o3 measured |
| LMArena Vision: Chinese | Not measured | 1237 | Only o3 measured |
| LMArena Vision: reading text | Not measured | 1218 | Only o3 measured |
| LMArena Vision: humor | Not measured | 1222 | Only o3 measured |
| LMArena Vision: captioning | Not measured | 1210 | Only o3 measured |
| LMArena Vision: recognizing things | Not measured | 1234 | Only o3 measured |
| LMArena Vision: creative writing | Not measured | 1201 | Only o3 measured |
| Neither model has a result on the other 12 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | DeepSeek V4 Flash 0423 | o3 | 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 Flash 0423 costs less
Repository review
50K input + 3K output tokens
DeepSeek V4 Flash 0423 costs less
Agent loop
200K input + 10K output tokens
DeepSeek V4 Flash 0423 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 Flash 0423 | OpenAI o3 |
|---|---|---|
| Maker | DeepSeek | OpenAI |
| Weights | Open weights | No public weights listed |
| Released | April 24, 2026 | April 16, 2025 |
| Context window | 1.05M | 200K |
| Input $/Mtok | $0.13 | $2.00 |
| Output $/Mtok | $0.28 | $8.00 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 1 | 0 |
| Cost per solved task | Not computable | $0.571 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is DeepSeek V4 Flash 0423 better than o3 for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick DeepSeek V4 Flash 0423 for output tokens 28.6x cheaper ($0.28 vs $8.00 per million) and a larger context window (1.05M against 200K tokens).
Which is cheaper, DeepSeek V4 Flash 0423 or o3?
DeepSeek V4 Flash 0423 costs $0.13 per million input tokens and $0.28 per million output tokens; o3 costs $2.00 and $8.00. Cost per solved task is known for o3 only.
Which has the bigger context window, DeepSeek V4 Flash 0423 or o3?
DeepSeek V4 Flash 0423, with 1.05M tokens against 200K.
How many benchmarks is the DeepSeek V4 Flash 0423 vs o3 comparison based on?
41 benchmarks have a result for both models as of October 21, 2026. DeepSeek V4 Flash 0423's coding index rests on 1 independent benchmark and o3's on 0. Where only one model has a result, the page says so instead of naming a winner.