Mercury 2.5 is cheaper than Claude 3 Sonnet at $0.04/M vs $3/M input tokens.
| Spec | Claude 3 Sonnet | Mercury 2.5 |
|---|---|---|
| Input price | $3/M tokens | $0.04/M tokens |
| Output price | $15/M tokens | $0.15/M tokens |
| Context window | — | 260K tokens |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Sep 2026 |
Not enough votes to call it. On the specs, nothing separates them.
Mercury 2.5 costs 100x less per token.
Reviewing agent-written code?See a Brief PR report
Mercury 2.5 is cheaper on both: 75× input, 100× output.
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.