Mercury 2.5 is cheaper than OpenAI o4-mini at $0.04/M vs $1.1/M input tokens.
| Spec | Mercury 2.5 | OpenAI o4-mini |
|---|---|---|
| Input price | $0.04/M tokens | $1.1/M tokens |
| Output price | $0.15/M tokens | $4.4/M tokens |
| Context window | 260K tokens | — |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Apr 2025 |
Not enough votes to call it. On the specs, Mercury 2.5 has the edge: bigger model tier, newer, bigger context window.
Mercury 2.5 costs 29x less per token.
Mercury 2.5 is cheaper on both: 28× input, 29× output.
Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.