Data points: 168
Model compare
The readout for DeepSeek V4 Flash and GPT-5.4, before the detailed comparison sheet.
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.4
GPT-5.4 has the higher weighted result; Model A / B score 12 to 88.
Evidence depth
168 data points
Includes 34 benchmark rows, 6 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 50 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for DeepSeek V4 Flash and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 12.0 pts | 88.0 pts |
| Benchmark category leads | 0 categories | 6 categories |
| Operational advantages | Cheapest input price, Average speed, Free providers | First-token latency, Provider coverage |
| Context window | 1.0M tokens | 1.1M tokens |
| Max output | 393.2K tokens | 128K tokens |
| Modalities | Input Text Output Text | Input Text |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| Developer | DeepSeek | OpenAI |
| Released | Apr 2026 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | DeepSeek | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | deepseek/deepseek-v4-flash | openai/gpt-5.4 |
| References | No data | No data |
This report only uses LMSpeed data for DeepSeek V4 Flash and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
DeepSeek V4 Flash
DeepSeek V4 Flash has these operational advantages: Cheapest input price, Average speed, Free providers.
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (First-token latency, Provider coverage).
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
DeepSeek V4 Flash
45.4
Avg. score
GPT-5.4
57.4
GPT-5.4 leads by 9.1
GPT-5.4 leads by 18.5
GPT-5.4 leads by 5.2
GPT-5.4 leads by 21.4
GPT-5.4 leads by 21.0
No data
GPT-5.4
GPT-5.4 leads by 0.1
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
DeepSeek V4 Flash
56.0
Rank #41/84 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner67.0
Rank #19/84 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
winner$0.280/M
Rank #7/162 · confidence 4
GPT-5.4
$15.00/M
Rank #136/162 · confidence 4
DeepSeek V4 Flash
winner$0.175/M
Rank #12/162 · confidence 4
GPT-5.4
$5.63/M
Rank #135/162 · confidence 4
DeepSeek V4 Flash
winner$0.140/M
Rank #17/162 · confidence 4
GPT-5.4
$2.50/M
Rank #131/162 · confidence 4
DeepSeek V4 Flash
63.0
Rank #53/89 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner74.0
Rank #6/89 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
7.1
Rank #29/73 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner23.4
Rank #7/73 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
winner86.7%
Rank #36/188 · confidence 4
GPT-5.4
74.8%
Rank #96/188 · confidence 4
DeepSeek V4 Flash
winner27.8%
Rank #36/187 · confidence 4
GPT-5.4
10.6%
Rank #91/187 · confidence 4
DeepSeek V4 Flash
44.9
Rank #41/96 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner56.6
Rank #4/96 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
56.2
Rank #23/59 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner71.0
Rank #11/59 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
52.6
Rank #31/37 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner57.7
Rank #15/37 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
42.0%
Rank #52/185 · confidence 4
GPT-5.4
winner47.1%
Rank #24/185 · confidence 4
DeepSeek V4 Flash
winner46.8
Rank #47/65 · confidence 2 · eval date 2026-04-24
GPT-5.4
42.4
Rank #53/65 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
winner81.6
Rank #6/56 · confidence 2 · eval date 2026-04-24
GPT-5.4
65.9
Rank #17/56 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
winner95.8
Rank #1/90 · confidence 2 · eval date 2026-04-24
GPT-5.4
88.6
Rank #18/90 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
32.1
Rank #27/96 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner41.6
Rank #8/96 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
88.1
Rank #18/24 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner92.8
Rank #8/24 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
37.2
Rank #33/90 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner50.0
Rank #9/90 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
40.3
Rank #27/99 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner51.4
Rank #10/99 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
89.4
Rank #27/96 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner92.0
Rank #11/96 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
60.1
Rank #40/55 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner77.3
Rank #16/55 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
1233.0
Rank #33/66 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner1245.0
Rank #32/66 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
winner79.2
Rank #5/86 · confidence 2 · eval date 2026-04-24
GPT-5.4
73.9
Rank #24/86 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
54.4
Rank #18/50 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner64.9
Rank #4/50 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
47.8
Rank #12/21 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner54.6
Rank #5/21 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
31.1
Rank #16/55 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner41.1
Rank #12/55 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
1189.0
Rank #21/55 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner1392.0
Rank #12/55 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
34.4
Rank #21/50 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner44.6
Rank #12/50 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
56.9
Rank #32/46 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner75.1
Rank #12/46 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
57.8
Rank #17/28 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner60.3
Rank #13/28 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
69.0
Rank #14/23 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner70.6
Rank #13/23 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
46.7
Rank #37/53 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner74.7
Rank #14/53 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
73.2
Rank #17/25 · confidence 2 · eval date 2026-04-24
GPT-5.4
winner82.7
Rank #14/25 · confidence 3 · eval date 2026-03-05
DeepSeek V4 Flash
winner95.0
Rank #19/84 · confidence 2 · eval date 2026-04-24
GPT-5.4
87.1
Rank #37/84 · confidence 3 · eval date 2026-03-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
Winner: GPT-5.4 | DeepSeek V4 Flash deepseek-v4-flash No audit yet | GPT-5.4 gpt-5.4 Audit score 100 100100100100 |
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 93 1008486100 | GPT-5.4 gpt-5.4 No audit yet |
Winner: GPT-5.4 | DeepSeek V4 Flash deepseek-v4-flash Audit score 85 846886100 | GPT-5.4 gpt-5.4 Audit score 93 100 |
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 92 1008484100 | GPT-5.4 gpt-5.4 No audit yet |
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 92 10068100100 | GPT-5.4 gpt-5.4 No audit yet |
Winner: GPT-5.4 | DeepSeek V4 Flash deepseek-ai/DeepSeek-V4-Flash No audit yet | GPT-5.4 gpt-5.4 Audit score 90 1008476100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
125 tests | DeepSeek V4 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 49 tok/s / 6084ms input / output No data |
70 tests | DeepSeek V4 Flash speed / latency 59 tok/s / 29380ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
30 tests | DeepSeek V4 Flash speed / latency 49 tok/s / 5413ms input / output No data | GPT-5.4 speed / latency 51 tok/s / 4032ms input / output No data |
25 tests | DeepSeek V4 Flash speed / latency 83 tok/s / 5114ms input / output No data | GPT-5.4 speed / latency 44 tok/s / 2518ms input / output No data |
25 tests | DeepSeek V4 Flash speed / latency 47 tok/s / 10092ms input / output No data | GPT-5.4 speed / latency 49 tok/s / 5435ms input / output No data |
DeepSeek V4 Flash deepseek-ai/deepseek-v4-flash speed / latency No data input / output $0/request | GPT-5.4 gpt-5-4 speed / latency No data input / output $0.080/request | |
DeepSeek V4 Flash deepseek-ai/deepseek-v4-flash speed / latency No data input / output $0/request | GPT-5.4 gpt-5.4-2026-03-05 speed / latency No data input / output $15.00/M | |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/M/$0/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.240/M | |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/M/$0/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $0/M | |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/M/$0/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.171/M |
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
