DeepSeek V4.1 Flash vs DeepSeek V5 (Leaked Staging)
A direct, empirical evaluation of DeepSeek V4.1 Flash (DeepSeek-AI) against DeepSeek V5 (Leaked Staging) (DeepSeek AI).
DeepSeek V4.1 Flash
Developed by DeepSeek-AI · 552B parameters
High-throughput software engineering, autonomous coding loops, terminal agents, 1M long-context retrieval, and low-cost production inference.
DeepSeek V5 (Leaked Staging)
Developed by DeepSeek AI · 1.8 Trillion (Sparse MoE) parameters
Autonomous coding agents scoring 81.4% on SWE-bench Verified, zero-telemetry self-hosting, sub-cent 1M-token processing, and formal mathematical proofs.
| Metric | DeepSeek V4.1 Flash | DeepSeek V5 (Leaked Staging) |
|---|---|---|
| SWE-bench Verified | 67.2% | 81.4% |
| MMLU-Pro | 78.4% | 87.5% |
| MATH-500 | 92.6% | 96.8% |
| Context Window | 1,000,000 tokens | 1,000,000 tokens |
| Input Pricing (per 1M) | $0.06 | $0.12 |
| Output Pricing (per 1M) | $0.22 | $0.48 |