Compare Claude Opus 5.5 from Anthropic and GPT-6 Luna from OpenAI 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 | GPT-6 Luna |
|---|---|---|
| Input price | $4/M tokens | $0.10/M tokens |
| Output price | $20/M tokens | $0.50/M tokens |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Intelligence Index | 59.1 | 27.9 |
| Coding Index | Not available | Not available |
| Agentic Index | Not available | Not available |
| Latency (p50) | 4.44 s | 1.22 s |
| Throughput (p50) | 65.0 tok/s | 127.0 tok/s |
| Provided by | Anthropic | OpenAI |
| Model page | Claude Opus 5.5 model details, providers and pricing | GPT-6 Luna model details, providers and pricing |
Benchmark data updated
GPT-6 Luna has the longer context window at 1,050,000 tokens, compared with 1,000,000 tokens for Claude Opus 5.5.
GPT-6 Luna is faster on OpenRouter, generating a median 127.0 tokens per second compared with 65.0 tokens per second for Claude Opus 5.5.