# DeepSeek V4 Flash vs GPT-5.4

> GPT-5.4 is the stronger model overall, scoring 59.4 to 53.6 on the Noometry Index. DeepSeek V4 Flash costs 21× less per token, which makes it the better buy when GPT-5.4's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/deepseek-v4-flash-vs-gpt-5-4
- Last updated: 2026-10-10
- Shared benchmarks: 39

## Summary

- They share 39 benchmarks with published results for both. DeepSeek V4 Flash scores higher in 0 categories and GPT-5.4 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.4 leads 73.5 to 60.3.
- The biggest single-benchmark swing is FrontierMath Tier 4: 24.4% for DeepSeek V4 Flash and 49% for GPT-5.4.
- DeepSeek V4 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $2.50 / $15 for GPT-5.4.
- GPT-5.4 accepts more context: 1.05M tokens versus 1M.
- DeepSeek V4 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 53.6 | 59.4 |
| Rank | 35 | 16 |
| Context | 1M | 1.05M |
| Input $/M | $0.15 | $2.50 |
| Output $/M | $0.60 | $15 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek V4 Flash: 47.9 (#59)
- GPT-5.4: 52.6 (#33)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| LMArena WebDev | 1582 | 1465 |
| SciCode | 49.9% | 56.6% |
| WeirdML | 63% | 77.7% |
| LMArena Coding | 1457 | 1497 |
| ALE-Bench | 1,306 | 1,607 |
| SWE-bench Verified | — | 76.9% |
| DeepSWE | — | 51.8% |
| FrontierCode | 18.8% | — |
| GSO | — | 31.4% |
| MirrorCode | — | 15.6% |
| AlgoTune | — | 1.85 |

## Agentic & Tool Use

- DeepSeek V4 Flash: —
- GPT-5.4: 46.5 (#13)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| Terminal-Bench | — | 81.8% |
| APEX-Agents | — | 52.4% |
| τ²-bench Banking | — | 39.4% |
| DeepResearch Bench | — | 35.1% |
| PostTrainBench | — | 19% |
| GBAEval | — | 45.1% |
| LMArena Search | — | 1197 |
| METR Time Horizons | — | 74.3% |
| Vending-Bench 2 | — | 6,144 |

## Reasoning

- DeepSeek V4 Flash: 53.7 (#30)
- GPT-5.4: 61.8 (#19)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| ARC-AGI-2 | 61.4% | 74% |
| Kagi LLM Benchmark | 52.2% | 63.8% |
| NYT Connections (extended) | 89.6% | 91.3% |
| ARC-AGI-1 | 89% | 93.7% |
| CritPt | 16.6% | 23.4% |
| Chess Puzzles | 33% | 44% |
| LMArena Hard Prompts | 1444 | 1485 |
| Mystery Game Puzzles | 34% | 37% |
| DTBench | 90.9% | 94.4% |
| LMCA | 41.7% | 52% |
| Epoch Capabilities Index | 154.49 | 156.81 |
| SimpleBench | 61.1% | — |
| EnigmaEval | — | 16% |
| Thematic Generalization | — | 80% |
| EBR-Bench | — | 25.4% |
| ForecastBench | — | 59.5 |

## Math

- DeepSeek V4 Flash: 60.3 (#37)
- GPT-5.4: 73.5 (#19)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 57.5% | 78.6% |
| FrontierMath Tier 4 | 24.4% | 49% |
| MathArena Final-Answer Competitions | 76.5% | 83.1% |
| OTIS Mock AIME 2024-2025 | 94.4% | 97.8% |
| ProofBench | 56% | 56% |
| LMArena Math | 1427 | 1488 |
| FrontierMath (Feb 2025 set) | — | 47.6% |
| FrontierMath Tier 4 (v1) | — | 27.1% |

## Knowledge

- DeepSeek V4 Flash: 55.4 (#48)
- GPT-5.4: 65.3 (#14)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| GPQA Diamond | 91% | 93.3% |
| SimpleQA Verified | 33.6% | 45.1% |
| LMArena Expert | 1441 | 1507 |
| Humanity's Last Exam | — | 36.2% |
| Vectara Hallucination Rate | — | 7% |

## Multimodal

- DeepSeek V4 Flash: —
- GPT-5.4: 43.7 (#20)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| LMArena Vision | — | 1303 |
| Blueprint-Bench 2 | — | 27.1% |
| Furniture Assembly | — | 37.5% |
| LMArena Document | — | 1471 |

## Multilingual

- DeepSeek V4 Flash: 53.0 (#72)
- GPT-5.4: 56.2 (#23)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| LMArena Non-English | 1420 | 1465 |
| LMArena Chinese | 1468 | 1519 |
| LMArena French | 1439 | 1493 |
| LMArena German | 1418 | 1472 |
| LMArena Japanese | 1406 | 1485 |
| LMArena Korean | 1384 | 1448 |
| LMArena Russian | 1428 | 1480 |
| LMArena Spanish | 1436 | 1454 |

## Instruction Following

- DeepSeek V4 Flash: 74.9 (#81)
- GPT-5.4: 77.1 (#27)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| LMArena Instruction Following | 1421 | 1469 |

## Long Context

- DeepSeek V4 Flash: 43.8 (#85)
- GPT-5.4: 50.3 (#8)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| LMArena Longer Query | 1434 | 1473 |
| CL-bench | — | 27.9% |
| CL-bench Life | — | 21.7% |

## Writing & Preference

- DeepSeek V4 Flash: 63.8 (#61)
- GPT-5.4: 71.9 (#17)

| Benchmark | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| LMArena Text | 1432 | 1469 |
| LMArena Creative Writing | 1403 | 1439 |
| EQ-Bench Creative Writing | 1559 | 1840 |
| LMArena Multi-Turn | 1449 | 1482 |
| EQ-Bench 4 | — | 1272 |

## FAQ

### Is DeepSeek V4 Flash better than GPT-5.4?

GPT-5.4 is the stronger model overall, scoring 59.4 to 53.6 on the Noometry Index. DeepSeek V4 Flash costs 21× less per token, which makes it the better buy when GPT-5.4's lead doesn't matter for your workload.

### Which is cheaper, DeepSeek V4 Flash or GPT-5.4?

DeepSeek V4 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; GPT-5.4 lists at $2.50 and $15.

### Is DeepSeek V4 Flash or GPT-5.4 better for coding?

GPT-5.4 scores higher on coding benchmarks: 52.6 versus 47.9 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.4 does, with 1.05M tokens against 1M.

### How many benchmarks do DeepSeek V4 Flash and GPT-5.4 share?

39 benchmarks have published results for both models. DeepSeek V4 Flash has 41 scored results on Noometry and GPT-5.4 has 68.