Is Grok 4.1 Fast (Reasoning) or GPT-5.4 Pro cheaper?

Grok 4.1 Fast (Reasoning) is cheaper on output tokens ($0.50 vs $180.00 per 1M).

Which has the larger context window, Grok 4.1 Fast (Reasoning) or GPT-5.4 Pro?

GPT-5.4 Pro has the larger context window (1.1M tokens).

Grok 4.1 Fast (Reasoning) vs GPT-5.4 Pro

Grok 4.1 Fast (Reasoning) is cheaper on output tokens, while GPT-5.4 Pro offers a larger context window. Choose Grok 4.1 Fast (Reasoning) or GPT-5.4 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Grok 4.1 Fast (Reasoning)	GPT-5.4 Pro
Provider	Azure	Azure
Input / 1M tokens	$0.20	$30.00
Output / 1M tokens	$0.50	$180.00
Context window	128K	1.1M
Parameters	—	—
Open weights	No	No
Released	Jun 2025	Mar 2026

Grok 4.1 Fast (Reasoning) details →GPT-5.4 Pro details →

FAQ

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