Data points: 64
Model compare
The readout for DeepSeek V4 Flash and Mercury 2, before the detailed comparison sheet.
Weighted outcome: Mercury 2. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Mercury 2
Mercury 2 has the higher weighted result; Model A / B score 10 to 90.
Evidence depth
64 data points
Includes 6 benchmark rows, 0 audit samples, and 5 provider examples.
Selection signal
Start with Mercury 2
The charts below split 11 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 Mercury 2: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | DeepSeek V4 Flash | Mercury 2 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 10.0 pts | 90.0 pts |
| Benchmark category leads | 0 categories | 2 categories |
| Operational advantages | Free providers, Provider coverage | Average speed, First-token latency |
| Context window | 1.0M tokens | 128K tokens |
| Max output | 65.5K tokens | 50K 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 | Mercury 2 |
|---|---|---|
| Developer | DeepSeek | Inception |
| Released | Apr 2026 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | DeepSeek | Other |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | deepseek/deepseek-v4-flash | inception/mercury-2 |
| References | No data | No data |
This report only uses LMSpeed data for DeepSeek V4 Flash and Mercury 2: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
DeepSeek V4 Flash
DeepSeek V4 Flash has these operational advantages: Free providers, Provider coverage.
Mercury 2
Mercury 2 is stronger in benchmark categories (Coding, Reasoning) and operational dimensions (Average speed, First-token latency).
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
45.8
Avg. score
Mercury 2
52.2
DeepSeek V4 Flash
Mercury 2 leads by 7.7
Mercury 2 leads by 0.5
DeepSeek V4 Flash
DeepSeek V4 Flash
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
winner$0.280/M
Rank #6/163 · confidence 4
Mercury 2
$0.750/M
Rank #29/163 · confidence 4
DeepSeek V4 Flash
winner$0.175/M
Rank #12/163 · confidence 4
Mercury 2
$0.375/M
Rank #33/163 · confidence 4
DeepSeek V4 Flash
winner$0.140/M
Rank #18/163 · confidence 4
Mercury 2
$0.250/M
Rank #37/163 · confidence 4
DeepSeek V4 Flash
winner86.7%
Rank #35/187 · confidence 4
Mercury 2
77.0%
Rank #88/187 · confidence 4
DeepSeek V4 Flash
winner27.8%
Rank #35/186 · confidence 4
Mercury 2
15.5%
Rank #69/186 · confidence 4
DeepSeek V4 Flash
winner42.0%
Rank #51/184 · confidence 4
Mercury 2
38.7%
Rank #83/184 · confidence 4
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | DeepSeek V4 Flash | Mercury 2 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | DeepSeek V4 Flash | Mercury 2 |
|---|---|---|
20 tests | DeepSeek V4 Flash speed / latency N/A / N/A input / output No data | Mercury 2 speed / latency 459 tok/s / 904ms input / output No data |
10 tests | DeepSeek V4 Flash speed / latency 88 tok/s / 3315ms input / output No data | Mercury 2 speed / latency 618 tok/s / 847ms input / output No data |
0 tests | DeepSeek V4 Flash deepseek-v4-flash:cloud speed / latency N/A / N/A input / output $0.0080/request | Mercury 2 mercury-2 speed / latency N/A / N/A input / output $0/request |
0 tests | DeepSeek V4 Flash speed / latency N/A / N/A input / output No data | Mercury 2 speed / latency N/A / N/A input / output No data |
0 tests | DeepSeek V4 Flash speed / latency N/A / N/A input / output No data | Mercury 2 speed / latency N/A / N/A input / output No data |
Weighted outcome: Mercury 2. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
