Claude Sonnet 5.5 vs DeepSeek V5 (Leaked Staging)
A direct, empirical evaluation of Claude Sonnet 5.5 (Anthropic) against DeepSeek V5 (Leaked Staging) (DeepSeek AI).
Claude Sonnet 5.5
Developed by Anthropic · Proprietary Frontier Dynamic Hybrid Reasoner parameters
Terminal-Bench 4.0 execution (70.6%), SWE-bench Verified coding (82.4%), GitHub Copilot multi-file edits, and low-latency autonomous agentic coding at $2/$10 pricing.
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 | Claude Sonnet 5.5 | DeepSeek V5 (Leaked Staging) |
|---|---|---|
| SWE-bench Verified | 82.4% | 81.4% |
| MMLU-Pro | 88.4% | 87.5% |
| MATH-500 | 95.2% | 96.8% |
| Context Window | 1,000,000 tokens | 1,000,000 tokens |
| Input Pricing (per 1M) | $2.00 | $0.12 |
| Output Pricing (per 1M) | $10.00 | $0.48 |