Claude Sonnet 4 vs DeepSeek V3.1 Terminus
DeepSeek V3.1 Terminus is cheaper on output tokens, while Claude Sonnet 4 offers a larger context window. Choose Claude Sonnet 4 or DeepSeek V3.1 Terminus based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 4 | DeepSeek V3.1 Terminus |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Input / 1M tokens | $3.00 | $0.27 |
| Output / 1M tokens | $15.00 | $1.00 |
| Context window | 200K | 164K |
| Parameters | — | — |
| Open weights | No | — |
| Released | May 2025 | — |
| Aider Polyglot score | 61.3 | — |
| SWE-bench Verified score | 76.8 | — |
| GPQA Diamond score | 78.3 | — |
| FrontierMath score | 4.1 | — |
| Epoch Capabilities Index score | 142 | — |
| LMArena (Chatbot Arena) Elo score | 1351 | 1419 |
| LMArena Vision Elo score | 1191 | — |
FAQ
Is Claude Sonnet 4 or DeepSeek V3.1 Terminus cheaper?
DeepSeek V3.1 Terminus is cheaper on output tokens ($1.00 vs $15.00 per 1M).
Which has the larger context window, Claude Sonnet 4 or DeepSeek V3.1 Terminus?
Claude Sonnet 4 has the larger context window (200K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.