Is Grok 4.20 (Reasoning) or GPT-5 Nano cheaper?

GPT-5 Nano is cheaper on output tokens ($0.40 vs $2.50 per 1M).

Which has the larger context window, Grok 4.20 (Reasoning) or GPT-5 Nano?

Grok 4.20 (Reasoning) has the larger context window (1M tokens).

Grok 4.20 (Reasoning) vs GPT-5 Nano

GPT-5 Nano is cheaper on output tokens, while Grok 4.20 (Reasoning) offers a larger context window. Choose Grok 4.20 (Reasoning) or GPT-5 Nano based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Grok 4.20 (Reasoning)	GPT-5 Nano
Provider	Merge Gateway	Merge Gateway
Input / 1M tokens	$1.25	$0.05
Output / 1M tokens	$2.50	$0.40
Context window	1M	400K
Parameters	—	—
Open weights	No	No
Released	Mar 2026	Aug 2025

Grok 4.20 (Reasoning) details →GPT-5 Nano details →

FAQ

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