Is GPT-6 Luna or Claude Fable 5.1 cheaper?

GPT-6 Luna is cheaper on output tokens ($0.50 vs $50.00 per 1M).

Which has the larger context window, GPT-6 Luna or Claude Fable 5.1?

GPT-6 Luna has the larger context window (1.1M tokens).

GPT-6 Luna vs Claude Fable 5.1

GPT-6 Luna is cheaper on output tokens, while GPT-6 Luna offers a larger context window. Choose GPT-6 Luna or Claude Fable 5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-6 Luna	Claude Fable 5.1
Provider	CrossModel	CrossModel
Input / 1M tokens	$0.10	$10.00
Output / 1M tokens	$0.50	$50.00
Context window	1.1M	1M
Parameters	—	—
Open weights	No	No
Released	Sep 2026	Sep 2026

GPT-6 Luna details →Claude Fable 5.1 details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.