Is GPT-5.1-Codex or GPT-3.5-Turbo cheaper?

GPT-3.5-Turbo is cheaper on output tokens ($1.40 vs $9.00 per 1M).

Which has the larger context window, GPT-5.1-Codex or GPT-3.5-Turbo?

GPT-5.1-Codex has the larger context window (400K tokens).

GPT-5.1-Codex vs GPT-3.5-Turbo

GPT-3.5-Turbo is cheaper on output tokens, while GPT-5.1-Codex offers a larger context window. Choose GPT-5.1-Codex or GPT-3.5-Turbo based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.1-Codex	GPT-3.5-Turbo
Provider	Poe	Poe
Input / 1M tokens	$1.10	$0.45
Output / 1M tokens	$9.00	$1.40
Context window	400K	16K
Parameters	—	20B
Open weights	No	No
Released	Nov 2025	Sep 2023

GPT-5.1-Codex 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.