Compare Claude Opus 5.5 from Anthropic and GPT-6 Astra 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.
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Artificial Analysis benchmark differences between Claude Opus 5.5 and GPT-6 Astra
| Benchmark | Claude Opus 5.5 | GPT-6 Astra | Difference |
|---|---|---|---|
| Intelligence Index | 59.1 +2.2 | 56.9 | Claude Opus 5.5 +2.2 |
| Coding Index | Not available | 76.9 | Not available |
| Agentic Index | Not available | 51.0 | Not available |
| Attribute | Claude Opus 5.5 | GPT-6 Astra |
|---|---|---|
| Input price | $4/M tokens | $10/M tokens |
| Output price | $20/M tokens | $50/M tokens |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Intelligence Index | 59.1 | 56.9 |
| Coding Index | Not available | 76.9 |
| Agentic Index | Not available | 51.0 |
| Latency (p50) | 4.53 s | 15.47 s |
| Throughput (p50) | 66.0 tok/s | 43.0 tok/s |
| Provided by | Anthropic | OpenAI |
| Model page | Claude Opus 5.5 model details, providers and pricing | GPT-6 Astra model details, providers and pricing |
Benchmark data updated
GPT-6 Astra has the longer context window at 1,050,000 tokens, compared with 1,000,000 tokens for Claude Opus 5.5.
Claude Opus 5.5 is faster on OpenRouter, generating a median 66.0 tokens per second compared with 43.0 tokens per second for GPT-6 Astra.