Data points: 125
Model compare
The readout for DeepSeek V4 Flash and GPT-5, before the detailed comparison sheet.
Weighted outcome: GPT-5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5
GPT-5 has the higher weighted result; Model A / B score 34.7 to 65.3.
Evidence depth
125 data points
Includes 22 benchmark rows, 3 audit samples, and 9 provider examples.
Selection signal
Start with GPT-5
The charts below split 34 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: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | DeepSeek V4 Flash | GPT-5 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 34.7 pts | 65.3 pts |
| Benchmark category leads | 2 categories | 4 categories |
| Operational advantages | Cheapest input price, Provider coverage | Average speed, First-token latency, Free providers |
| Context window | 1.0M tokens | 400K 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 |
|---|---|---|
| Developer | DeepSeek | OpenAI |
| Released | Apr 2026 | Aug 2025 |
| Parameters | No data | No data |
| Tokenizer | DeepSeek | GPT |
| Knowledge cutoff | No data | 2024-09-30 |
| OpenRouter ID | deepseek/deepseek-v4-flash | openai/gpt-5 |
| References | No data | No data |
This report only uses LMSpeed data for DeepSeek V4 Flash and GPT-5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
DeepSeek V4 Flash
DeepSeek V4 Flash is stronger in benchmark categories (Agents, Instruction following) and operational dimensions (Cheapest input price, Provider coverage).
GPT-5
GPT-5 is stronger in benchmark categories (Coding, Reasoning, Knowledge, Math) and operational dimensions (Average speed, First-token latency, Free providers).
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
51.9
DeepSeek V4 Flash leads by 1.6
GPT-5 leads by 4.6
GPT-5 leads by 0.4
GPT-5 leads by 11.4
GPT-5 leads by 25.0
No data
No data
DeepSeek V4 Flash leads by 1.1
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
DeepSeek V4 Flash
winner$0.280/M
Rank #7/162 · confidence 4
GPT-5
$10.00/M
Rank #120/162 · confidence 4
DeepSeek V4 Flash
winner$0.175/M
Rank #12/162 · confidence 4
GPT-5
$3.44/M
Rank #117/162 · confidence 4
DeepSeek V4 Flash
winner$0.140/M
Rank #17/162 · confidence 4
GPT-5
$1.25/M
Rank #107/162 · confidence 4
DeepSeek V4 Flash
63.0
Rank #53/89 · confidence 2 · eval date 2026-04-24
GPT-5
winner75.6
Rank #2/89 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner86.2%
Rank #15/125 · confidence 2 · eval date 2026-04-24
GPT-5
80.6%
Rank #57/125 · confidence 4
DeepSeek V4 Flash
winner7.1
Rank #29/73 · confidence 2 · eval date 2026-04-24
GPT-5
5.7
Rank #30/73 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner86.7%
Rank #36/188 · confidence 4
GPT-5
67.3%
Rank #121/188 · confidence 4
DeepSeek V4 Flash
winner27.8%
Rank #36/187 · confidence 4
GPT-5
5.4%
Rank #132/187 · confidence 4
DeepSeek V4 Flash
winner56.2
Rank #23/59 · confidence 2 · eval date 2026-04-24
GPT-5
37.8
Rank #41/59 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner44.9
Rank #41/96 · confidence 2 · eval date 2026-04-24
GPT-5
42.9
Rank #46/96 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner42.0%
Rank #52/185 · confidence 4
GPT-5
38.8%
Rank #83/185 · confidence 4
DeepSeek V4 Flash
winner95.8
Rank #1/90 · confidence 2 · eval date 2026-04-24
GPT-5
82.1
Rank #31/90 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
37.2
Rank #33/90 · confidence 2 · eval date 2026-04-24
GPT-5
winner40.7
Rank #20/90 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner89.4
Rank #27/96 · confidence 2 · eval date 2026-04-24
GPT-5
85.4
Rank #45/96 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner32.1
Rank #27/96 · confidence 2 · eval date 2026-04-24
GPT-5
26.5
Rank #39/96 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner40.3
Rank #27/99 · confidence 2 · eval date 2026-04-24
GPT-5
34.7
Rank #48/99 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner1233.0
Rank #33/66 · confidence 2 · eval date 2026-04-24
GPT-5
1209.0
Rank #40/66 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner79.2
Rank #5/86 · confidence 2 · eval date 2026-04-24
GPT-5
73.1
Rank #29/86 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner31.1
Rank #16/55 · confidence 2 · eval date 2026-04-24
GPT-5
25.7
Rank #28/55 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner95.0
Rank #19/84 · confidence 2 · eval date 2026-04-24
GPT-5
84.8
Rank #44/84 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner1189.0
Rank #21/55 · confidence 2 · eval date 2026-04-24
GPT-5
1079.0
Rank #31/55 · confidence 1 · eval date 2025-08-07
DeepSeek V4 Flash
winner34.4
Rank #21/50 · confidence 2 · eval date 2026-04-24
GPT-5
28.9
Rank #31/50 · confidence 1 · eval date 2025-08-07
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | DeepSeek V4 Flash | GPT-5 |
|---|---|---|
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 92 1008484100 | GPT-5 gpt-5-chat-latest No audit yet |
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 92 10068100100 | GPT-5 gpt-5-chat-latest No audit yet |
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 85 846886100 | GPT-5 gpt-5 No audit yet |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | DeepSeek V4 Flash | GPT-5 |
|---|---|---|
70 tests | DeepSeek V4 Flash speed / latency 59 tok/s / 29380ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
20 tests | DeepSeek V4 Flash speed / latency N/A / N/A input / output No data | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data |
20 tests | DeepSeek V4 Flash speed / latency 83 tok/s / 5114ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
15 tests | DeepSeek V4 Flash speed / latency 42 tok/s / 3076ms input / output No data | GPT-5 speed / latency 45 tok/s / 3704ms input / output No data |
10 tests | DeepSeek V4 Flash speed / latency 86 tok/s / 4077ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0.012/M/$0.023/M | GPT-5 gpt-5 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 gpt-5 speed / latency No data input / output $0.086/M | |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/request | GPT-5 gpt-5-chat-latest speed / latency No data input / output $0/request | |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/request | GPT-5 gpt-5 speed / latency No data input / output $8.00/M |
Weighted outcome: GPT-5. 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 |
|---|
