Is GPT OSS 20B or Claude Fable 5 cheaper?

GPT OSS 20B is cheaper on output tokens ($0.30 vs $50.00 per 1M).

Which has the larger context window, GPT OSS 20B or Claude Fable 5?

Claude Fable 5 has the larger context window (1M tokens).

GPT OSS 20B vs Claude Fable 5

GPT OSS 20B is cheaper on output tokens, while Claude Fable 5 offers a larger context window. Choose GPT OSS 20B or Claude Fable 5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT OSS 20B	Claude Fable 5
Provider	Cloudflare AI Gateway	Cloudflare AI Gateway
Input / 1M tokens	$0.20	$10.00
Output / 1M tokens	$0.30	$50.00
Context window	128K	1M
Parameters	21B	—
Open weights	No	No
Released	Aug 2025	Jun 2026

GPT OSS 20B details →Claude Fable 5 details →

FAQ

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