Data points: 87
The readout for DeepSeek V4 Flash and Qwen3.5, before the detailed comparison sheet.
Decision read
DeepSeek V4 Flash
DeepSeek V4 Flash currently has the stronger profile, with verified wins split 5 to 1.
Evidence depth
87 data points
Includes 8 benchmark rows, 1 audit samples, and 7 provider examples.
Selection signal
Start with DeepSeek V4 Flash
The charts below split 16 high-signal samples across speed, scores, and audit health.
Model compare DeepSeek V4 Flash vs Qwen3.5deepseek-v4-flash-vs-qwen3-5 | Model A DeepSeek V4 Flash | Model B Qwen3.5 |
|---|---|---|
| Overall leader | Leading | Contender |
| Verified metric wins | 5 wins | 1 wins |
| Where it leads | Cheapest input price, Average speed, 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 | Qwen3.5 |
|---|---|---|
| Output price | $0.280/M#4 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | DeepSeek V4 Flash | Qwen3.5 |
|---|---|---|
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 81 72 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | DeepSeek V4 Flash | Qwen3.5 |
|---|---|---|
220 tests | DeepSeek V4 Flash speed / latency 24 tok/s / 9354ms input / output No data |
This report only uses LMSpeed data for DeepSeek V4 Flash and Qwen3.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | DeepSeek V4 Flash | Qwen3.5 |
|---|---|---|
| When to choose each model | DeepSeek V4 Flash DeepSeek V4 Flash is stronger when you prioritize Cheapest input price, Average speed, First-token latency, Provider coverage, Recent tests. | Qwen3.5 Qwen3.5 is stronger when you prioritize Free providers. |
TL;DR: DeepSeek V4 Flash leads across 87 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from DeepSeek V4 Flash vs Qwen3.5 into nearby model comparisons with enough verified LMSpeed data.
| Free providers |
| Model metadata | DeepSeek V4 Flash exposes 1.0M tokens; notable signals: Text input, Text output, Tool calling, Structured outputs. | Qwen3.5 exposes 262.1K tokens; notable signals: Text input, Image input, Text output, Tool calling. |
|---|---|---|
| Developer | DeepSeek | No data |
| Context window | 1.0M tokens | 262.1K tokens |
| Max output | 131.1K tokens | 262.1K tokens |
| Released | Apr 2026 | Mar 2026 |
| Modalities | Input Text Output Text | Input TextImagevideo Output Text |
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | 9B |
| Tokenizer | DeepSeek | Qwen3 |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | deepseek/deepseek-v4-flash | qwen/qwen3.5-9b |
| References | No data | No data |
| Input price | $0.140/M#8 | $0.600/M#23 |
|---|
| Blended price | $0.175/M#10 | $1.35/M#45 |
|---|
| GPQA | 89.4%#11 | 89.3%#12 |
|---|
| HLE | 32.1%#13 | 27.3%#21 |
|---|
| SciCode | 44.9%#23 | 42.0%#36 |
|---|
| Time to first token | 0.94 s#34 | 1.80 s#65 |
|---|
| Output speed | 96.7 tok/s#52 | 51.8 tok/s#86 |
|---|
Qwen3.5 qwen3.5-122b-a10b No audit yet |
Qwen3.5
speed / latency
37 tok/s / 5734ms
input / output
No data
SiliconFlow55 tests | DeepSeek V4 Flash speed / latency 45 tok/s / 9731ms input / output No data | Qwen3.5 speed / latency 54 tok/s / 25712ms input / output No data |
|---|
阿里云百炼 DashScope25 tests | DeepSeek V4 Flash speed / latency 108 tok/s / 3324ms input / output No data | Qwen3.5 speed / latency 40 tok/s / 21867ms input / output No data |
|---|
小水管 API20 tests | DeepSeek V4 Flash deepseek-v4-flash speed / latency 83 tok/s / 5114ms input / output $0/M / $0/M | Qwen3.5 qwen3.5-2b speed / latency N/A / N/A input / output $0.0071/M / $0.0071/M |
|---|
Koru API15 tests | DeepSeek V4 Flash speed / latency N/A / N/A input / output No data | Qwen3.5 speed / latency 131 tok/s / 9324ms input / output No data |
|---|
DeepSeek V4 Flash deepseek-ai/deepseek-v4-flash speed / latency No data input / output $0/M / $0/M | Qwen3.5 qwen/qwen3.5-122b-a10b speed / latency No data input / output $0/M / $0/M |
DeepSeek V4 Flash deepseek-v4-flash-nothinking speed / latency No data input / output $40.00/M / $400.00/M | Qwen3.5 qwen/qwen3.5-397b-a17b speed / latency No data input / output $0/M / $0/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
