Mercury 2 vs DeepSeek V4.1 Flash Heretic Thinking
DeepSeek V4.1 Flash Heretic Thinking is cheaper on output tokens, while DeepSeek V4.1 Flash Heretic Thinking offers a larger context window. Choose Mercury 2 or DeepSeek V4.1 Flash Heretic Thinking based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Mercury 2 | DeepSeek V4.1 Flash Heretic Thinking |
|---|---|---|
| Provider | Inception | NanoGPT |
| Input / 1M tokens | $0.25 | $0.18 |
| Output / 1M tokens | $0.75 | $0.72 |
| Context window | 128K | 512K |
| Parameters | — | — |
| Open weights | No | Yes |
| Released | Feb 2026 | Oct 2026 |
| LMArena (Chatbot Arena) Elo score | 1355 | — |
| LMArena WebDev Elo score | 1170 | — |
FAQ
Is Mercury 2 or DeepSeek V4.1 Flash Heretic Thinking cheaper?
DeepSeek V4.1 Flash Heretic Thinking is cheaper on output tokens ($0.72 vs $0.75 per 1M).
Which has the larger context window, Mercury 2 or DeepSeek V4.1 Flash Heretic Thinking?
DeepSeek V4.1 Flash Heretic Thinking has the larger context window (512K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.