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  1. Home
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  3. Compare

Claude Fable 5.1 vs GPT-6 Astra

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.

Favicon for anthropic
Claude Fable 5.1
Favicon for openai
GPT-6 Astra
Favicon for anthropic
Claude Fable 5.1
Favicon for openai
GPT-6 Astra

Overview

Claude Fable 5.1
Author
Anthropic
GPT-6 Astra
Author
OpenAI
Claude Fable 5.1
Context length
1Mtokens
GPT-6 Astra
Context length
1.05Mtokens
Claude Fable 5.1
Reasoning
GPT-6 Astra
Reasoning
Claude Fable 5.1
Input modalities
GPT-6 Astra
Input modalities
Claude Fable 5.1
Output modalities
GPT-6 Astra
Output modalities

Claude Fable 5.1 vs GPT-6 Astra: side-by-side summary

Claude Fable 5.1 and GPT-6 Astra are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Fable 5.1, from Anthropic, has a 1,000,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.

GPT-6 Astra, from OpenAI, has a 1,050,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.

Context window
  • Claude Fable 5.1: 1,000,000 tokens
  • GPT-6 Astra: 1,050,000 tokens
Price
  • Claude Fable 5.1: $10/M tokens input, $50/M tokens output
  • GPT-6 Astra: $10/M tokens input, $50/M tokens output
Provided by
  • Claude Fable 5.1: Anthropic
  • GPT-6 Astra: OpenAI
  • Claude Fable 5.1 model details, providers and pricing
  • GPT-6 Astra model details, providers and pricing

Claude Fable 5.1 vs GPT-6 Astra at a glance

Claude Fable 5.1 vs GPT-6 Astra comparison
AttributeClaude Fable 5.1GPT-6 Astra
Input price$10/M tokens$10/M tokens
Output price$50/M tokens$50/M tokens
Context window1,000,000 tokens1,050,000 tokens
Intelligence Index53.452.7
Coding Index81.676.9
Agentic Index57.951.0
Latency (p50)7.12 s5.59 s
Throughput (p50)53.0 tok/s35.0 tok/s

Benchmark data updated Oct 5, 2026

Frequently asked questions

Which has the longer context window, Claude Fable 5.1 or GPT-6 Astra?

GPT-6 Astra has the longer context window at 1,050,000 tokens, compared with 1,000,000 tokens for Claude Fable 5.1.

Which is faster, Claude Fable 5.1 or GPT-6 Astra?

Claude Fable 5.1 is faster on OpenRouter, generating a median 53.0 tokens per second compared with 35.0 tokens per second for GPT-6 Astra.

Which scores higher on coding, Claude Fable 5.1 or GPT-6 Astra?

Claude Fable 5.1 scores higher on coding, with an Artificial Analysis Coding Index of 81.6 compared with 76.9 for GPT-6 Astra.