Compare Claude Opus 5.5 from Anthropic and Mercury 3 from inception on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
| Attribute | Claude Opus 5.5 | Mercury 3 |
|---|---|---|
| Input price | $4/M tokens | $0.10/M tokens |
| Output price | $20/M tokens | $0.35/M tokens |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Intelligence Index | 58.4 | Not available |
| Coding Index | Not available | Not available |
| Agentic Index | Not available | Not available |
| Latency (p50) | 3.36 s | 0.72 s |
| Throughput (p50) | 71.0 tok/s | 337.0 tok/s |
| Provided by | Anthropic | inception |
| Model page | Claude Opus 5.5 model details, providers and pricing | Mercury 3 model details, providers and pricing |
Benchmark data updated
Mercury 3 is cheaper than Claude Opus 5.5 on OpenRouter: Mercury 3 costs $0.10/M tokens input and $0.35/M tokens output, while Claude Opus 5.5 costs $4/M tokens input and $20/M tokens output.
Claude Opus 5.5 and Mercury 3 have the same context window of 1,000,000 tokens.
Mercury 3 is faster on OpenRouter, generating a median 337.0 tokens per second compared with 71.0 tokens per second for Claude Opus 5.5.