Is GPT-5.1 Chat or OpenAI: GPT-5.4 Nano cheaper?

OpenAI: GPT-5.4 Nano is cheaper on output tokens ($1.25 vs $10.00 per 1M).

Which has the larger context window, GPT-5.1 Chat or OpenAI: GPT-5.4 Nano?

OpenAI: GPT-5.4 Nano has the larger context window (400K tokens).

GPT-5.1 Chat vs OpenAI: GPT-5.4 Nano

OpenAI: GPT-5.4 Nano is cheaper on output tokens, while OpenAI: GPT-5.4 Nano offers a larger context window. Choose GPT-5.1 Chat or OpenAI: GPT-5.4 Nano based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.1 Chat	OpenAI: GPT-5.4 Nano
Provider	OpenAI	OpenAI
Input / 1M tokens	$1.25	$0.20
Output / 1M tokens	$10.00	$1.25
Context window	128K	400K
Parameters	—	—
Open weights	No	No
Released	Nov 2025	Mar 2026

GPT-5.1 Chat details →OpenAI: GPT-5.4 Nano details →

FAQ

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