Compare Claude Fable 5.1 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.
| Attribute | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Input price | $10/M tokens | $10/M tokens |
| Output price | $50/M tokens | $50/M tokens |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Intelligence Index | 49.7 | 56.9 |
| Coding Index | 80.7 | 76.9 |
| Agentic Index | 57.2 | 51.0 |
| Latency (p50) | 3.58 s | 4.01 s |
| Throughput (p50) | 71.0 tok/s | 66.0 tok/s |
| Provided by | Anthropic | OpenAI |
| Model page | Claude Fable 5.1 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 Fable 5.1.
Claude Fable 5.1 is faster on OpenRouter, generating a median 71.0 tokens per second compared with 66.0 tokens per second for GPT-6 Astra.
Claude Fable 5.1 scores higher on coding, with an Artificial Analysis Coding Index of 80.7 compared with 76.9 for GPT-6 Astra.