Is Grok-4-Fast-Reasoning or GPT-3.5-Turbo cheaper?

Grok-4-Fast-Reasoning is cheaper on output tokens ($0.50 vs $1.40 per 1M).

Which has the larger context window, Grok-4-Fast-Reasoning or GPT-3.5-Turbo?

Grok-4-Fast-Reasoning has the larger context window (2M tokens).

Grok-4-Fast-Reasoning vs GPT-3.5-Turbo

Grok-4-Fast-Reasoning is cheaper on output tokens, while Grok-4-Fast-Reasoning offers a larger context window. Choose Grok-4-Fast-Reasoning or GPT-3.5-Turbo based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Grok-4-Fast-Reasoning	GPT-3.5-Turbo
Provider	Poe	Poe
Input / 1M tokens	$0.20	$0.45
Output / 1M tokens	$0.50	$1.40
Context window	2M	16K
Parameters	—	20B
Open weights	No	No
Released	Sep 2025	Sep 2023

Grok-4-Fast-Reasoning details →GPT-3.5-Turbo details →

FAQ

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