What is the difference between Claude Fable 5 and GPT-6 Astra?

Claude Fable 5 is developed by Anthropic while GPT-6 Astra is developed by OpenAI. Claude Fable 5 has a 1.0M token context window vs GPT-6 Astra's 1.1M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5 or GPT-6 Astra?

It depends on your use case. Claude Fable 5 and GPT-6 Astra each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Claude Fable 5 cost compared to GPT-6 Astra?

Claude Fable 5 costs $10/M input tokens and GPT-6 Astra costs $10/M input tokens. GPT-6 Astra is $0.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude Fable 5 and GPT-6 Astra on Rival?

This page shows a side-by-side comparison of Claude Fable 5 and GPT-6 Astra across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Sep 2026

Claude Fable 5vsGPT-6 Astra

GPT-6 Astra has a larger context window than Claude Fable 5 (1.1M tokens vs 1.0M tokens).

Claude Fable 5 and GPT-6 Astra compared across 54 shared prompts
Spec	Claude Fable 5	GPT-6 Astra
Input price	$10/M tokens	$10/M tokens
Output price	$50/M tokens	$50/M tokens
Context window	1.0M tokens	1.1M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Jun 2026	Sep 2026