Data points: 84
Model compare
The readout for DeepSeek V4 Flash and Qwen3.5 Plus, before the detailed comparison sheet.
Weighted outcome: DeepSeek V4 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
DeepSeek V4 Flash
DeepSeek V4 Flash has the higher weighted result; Model A / B score 73.3 to 26.7.
Evidence depth
84 data points
Includes 2 benchmark rows, 3 audit samples, and 8 provider examples.
Selection signal
Start with DeepSeek V4 Flash
The charts below split 13 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 Qwen3.5 Plus: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | DeepSeek V4 Flash | Qwen3.5 Plus |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 73.3 pts | 26.7 pts |
| Benchmark category leads | 2 categories | 1 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage | No data |
| Context window | 1.0M tokens | 1M tokens |
| Max output | 393.2K tokens | 65.5K 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 | Qwen3.5 Plus |
|---|---|---|
| Developer | DeepSeek | Alibaba |
| Released | Apr 2026 | Apr 2026 |
| Parameters | No data | No data |
| Tokenizer | DeepSeek | Qwen3 |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | deepseek/deepseek-v4-flash | qwen/qwen3.5-plus-20260420 |
| References | No data | No data |
This report only uses LMSpeed data for DeepSeek V4 Flash and Qwen3.5 Plus: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
DeepSeek V4 Flash
DeepSeek V4 Flash is stronger in benchmark categories (Agents, Coding) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).
Qwen3.5 Plus
Qwen3.5 Plus leads these benchmark categories: Math.
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
47.2
Avg. score
Qwen3.5 Plus
46.6
DeepSeek V4 Flash leads by 3.6
DeepSeek V4 Flash leads by 5.0
DeepSeek V4 Flash
DeepSeek V4 Flash
Qwen3.5 Plus leads by 12.4
No data
No data
DeepSeek V4 Flash
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
DeepSeek V4 Flash
winner56.0
Rank #48/91 · confidence 2 · eval date 2026-07-31
Qwen3.5 Plus
51.0
Rank #63/91 · confidence 1 · eval date 2026-03-04
DeepSeek V4 Flash
winner81.6
Rank #6/58 · confidence 2 · eval date 2026-07-31
Qwen3.5 Plus
39.8
Rank #39/58 · confidence 1 · eval date 2026-03-04
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | DeepSeek V4 Flash | Qwen3.5 Plus |
|---|---|---|
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 92 1008484100 | Qwen3.5 Plus qwen3.5-plus-2026-02-15 No audit yet |
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 85 846886100 | Qwen3.5 Plus qwen3.5-plus-2026-02-15 No audit yet |
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 84 787584100 | Qwen3.5 Plus qwen3.5-plus 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 | Qwen3.5 Plus |
|---|---|---|
110 tests | DeepSeek V4 Flash speed / latency 68 tok/s / 20872ms input / output No data | Qwen3.5 Plus speed / latency N/A / N/A input / output No data |
35 tests | DeepSeek V4 Flash speed / latency 108 tok/s / 3324ms input / output No data | Qwen3.5 Plus speed / latency 44 tok/s / 19579ms input / output No data |
25 tests | DeepSeek V4 Flash speed / latency 83 tok/s / 5114ms input / output No data | Qwen3.5 Plus speed / latency 54 tok/s / 4374ms input / output No data |
10 tests | DeepSeek V4 Flash speed / latency 31 tok/s / 7293ms input / output No data | Qwen3.5 Plus speed / latency N/A / N/A input / output No data |
10 tests | DeepSeek V4 Flash speed / latency 86 tok/s / 4077ms input / output No data | Qwen3.5 Plus speed / latency N/A / N/A input / output No data |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/M/$0/M | Qwen3.5 Plus qwen3.5-plus speed / latency No data input / output $0.014/M | |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0.0012/request | Qwen3.5 Plus qwen3.5-plus speed / latency No data input / output $0.044/M | |
DeepSeek V4 Flash deepseek-ai/deepseek-v4-flash speed / latency No data input / output $0.010/request | Qwen3.5 Plus qwen3.5-plus-nx speed / latency No data input / output $0.010/request |
Weighted outcome: DeepSeek V4 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
