Data points: 84
The readout for DeepSeek V4 Flash and GPT-5.4, before the detailed comparison sheet.
Decision read
GPT-5.4
GPT-5.4 currently has the stronger profile, with verified wins split 2 to 4.
Evidence depth
84 data points
Includes 8 benchmark rows, 4 audit samples, and 9 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 21 high-signal samples across speed, scores, and audit health.
Model compare DeepSeek V4 Flash vs GPT-5.4deepseek-v4-flash-vs-gpt-5-4 | Model A DeepSeek V4 Flash | Model B GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 2 wins | 4 wins |
| Where it leads | Average speed, Free providers | Cheapest input price, First-token latency, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| GPQA | 89.4%#11 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 92 100 |
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 |
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.
| Guidance | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|
| When to choose each model | DeepSeek V4 Flash DeepSeek V4 Flash is stronger when you prioritize Average speed, Free providers. | GPT-5.4 GPT-5.4 is stronger when you prioritize Cheapest input price, First-token latency, Provider coverage, Recent tests. |
TL;DR: GPT-5.4 leads across 84 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from DeepSeek V4 Flash vs GPT-5.4 into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | No OpenRouter metadata is available yet for this model. | No OpenRouter metadata is available yet for this model. |
|---|---|---|
| Developer | DeepSeek | OpenAI |
| Context window | No data | No data |
| Max output | No data | No data |
| Released | No data | No data |
| Modalities | No data | No data |
| Features | None listed | None listed |
| Parameters | No data | No data |
| Tokenizer | No data | No data |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | No data | No data |
| References | No data | No data |
| SciCode | 44.9%#23 | 56.6%#3 |
|---|
| HLE | 32.1%#13 | 41.6%#4 |
|---|
| Output price | $0.280/M#4 | $15.00/M#43 |
|---|
| Input price | $0.140/M#8 | $2.50/M#36 |
|---|
| Blended price | $0.175/M#10 | $5.63/M#62 |
|---|
| Time to first token | 0.98 s#37 | 197.76 s#110 |
|---|
| Output speed | 92.9 tok/s#53 | 85.8 tok/s#57 |
|---|
GPT-5.4 gpt-5.4 No audit yet |
MyDamoxingWinner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 84 787584100 | GPT-5.4 gpt-5.4 No audit yet |
|---|
小水管 APIWinner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 81 727280100 | GPT-5.4 gpt-5.4 No audit yet |
|---|
TokenessWinner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 79 648468100 | GPT-5.4 gpt-5.4 No audit yet |
|---|
GPT-5.4
speed / latency
49 tok/s / 6084ms
input / output
No data
Sub2API30 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 |
|---|
小水管 API25 tests | DeepSeek V4 Flash deepseek-v4-flash speed / latency 83 tok/s / 5114ms input / output $0/M / $0/M | GPT-5.4 gpt-5.4 speed / latency 44 tok/s / 2518ms input / output $0/M / $0/M |
|---|
星见雅 API25 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 |
|---|
Fengsili API20 tests | DeepSeek V4 Flash speed / latency 86 tok/s / 4077ms input / output No data | GPT-5.4 speed / latency 88 tok/s / 6075ms input / output No data |
|---|
DeepSeek V4 Flash deepseek-ai/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 $0.080/M / $0.080/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 $75.00/M / $450.00/M |
DeepSeek V4 Flash deepseek-ai/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 $2.50/M / $15.00/M |
DeepSeek V4 Flash deepseek-v4-flash-free speed / latency No data input / output $0/M / $0/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $3.00/M / $18.00/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
