Mercury 2.5 Preview vs Union Alpha
Specs, per-token pricing, and live benchmark scores — refreshed daily from our benchmark database.
Specs & pricing
| Mercury 2.5 Preview | Union Alpha | |
|---|---|---|
| Company | Inception | Stealth |
| Released | Aug 2026 | Sep 2026 |
| Context window | 260K | 262K |
| Input /1M tokens | $0.04 | free |
| Output /1M tokens | $0.15 | free |
| Open weights | No | No |
Benchmarks
| Benchmark | Mercury 2.5 Preview | Union Alpha |
|---|---|---|
| Speed (tok/s) | 1107 tok/s | — |
Scores come from published leaderboards and official model cards (sources listed on the benchmarks page) and refresh daily. Pricing via vendor pages and OpenRouter.