Is Grok 4.1 Fast or xAI: Grok 4.20 cheaper?

Grok 4.1 Fast and xAI: Grok 4.20 have comparable output pricing.

Which has the larger context window, Grok 4.1 Fast or xAI: Grok 4.20?

xAI: Grok 4.20 has the larger context window (2M tokens).

Grok 4.1 Fast vs xAI: Grok 4.20

Both have similar output pricing, while xAI: Grok 4.20 offers a larger context window. Choose Grok 4.1 Fast or xAI: Grok 4.20 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Grok 4.1 Fast	xAI: Grok 4.20
Provider	xAI	xAI
Input / 1M tokens	—	$1.25
Output / 1M tokens	—	$2.50
Context window	—	2M
Parameters	—	500B
Open weights	No	No
Released	Nov 2025	Feb 2026

Grok 4.1 Fast details →xAI: Grok 4.20 details →

FAQ

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