Mercury 2 is the newer model, released after Claude Opus 4.5.
| Spec | Claude Opus 4.5 | Mercury 2 |
|---|---|---|
| Input price | — | $0.25/M tokens |
| Output price | — | $0.75/M tokens |
| Context window | — | 128K tokens |
| Released | Nov 2025 | Mar 2026 |
Not enough votes to call it. On the specs, Claude Opus 4.5 has the edge: bigger model tier, major provider backing.
Mercury 2 uses 2.7x more transitions
Mercury 2 is the newer model, released after Claude Opus 4.5.
| Spec | Claude Opus 4.5 | Mercury 2 |
|---|---|---|
| Input price | — | $0.25/M tokens |
| Output price | — | $0.75/M tokens |
| Context window | — | 128K tokens |
| Released | Nov 2025 | Mar 2026 |
Not enough votes to call it. On the specs, Claude Opus 4.5 has the edge: bigger model tier, major provider backing.
Mercury 2 uses 2.7x more transitions