Synth 2.5 Pro Preview vs Yi Lightning
Synth 2.5 Pro Preview is cheaper on output tokens, while Synth 2.5 Pro Preview offers a larger context window. Choose Synth 2.5 Pro Preview or Yi Lightning based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Synth 2.5 Pro Preview | Yi Lightning |
|---|---|---|
| Provider | NanoGPT | NanoGPT |
| Input / 1M tokens | $0.10 | $0.20 |
| Output / 1M tokens | $0.20 | $0.20 |
| Context window | 30K | 12K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Sep 2026 | Oct 2024 |
| Aider Polyglot score | — | 12.9 |
| LMArena (Chatbot Arena) Elo score | — | 1302 |
FAQ
Is Synth 2.5 Pro Preview or Yi Lightning cheaper?
Synth 2.5 Pro Preview is cheaper on output tokens ($0.20 vs $0.20 per 1M).
Which has the larger context window, Synth 2.5 Pro Preview or Yi Lightning?
Synth 2.5 Pro Preview has the larger context window (30K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.