Is GPT 5.3 Codex or GPT-3.5 Turbo Instruct cheaper?

GPT-3.5 Turbo Instruct is cheaper on output tokens ($2.00 vs $14.00 per 1M).

Which has the larger context window, GPT 5.3 Codex or GPT-3.5 Turbo Instruct?

GPT 5.3 Codex has the larger context window (400K tokens).

GPT 5.3 Codex vs GPT-3.5 Turbo Instruct

GPT-3.5 Turbo Instruct is cheaper on output tokens, while GPT 5.3 Codex offers a larger context window. Choose GPT 5.3 Codex or GPT-3.5 Turbo Instruct based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT 5.3 Codex	GPT-3.5 Turbo Instruct
Provider	Vercel AI Gateway	Vercel AI Gateway
Input / 1M tokens	$1.75	$1.50
Output / 1M tokens	$14.00	$2.00
Context window	400K	8K
Parameters	—	20B
Open weights	No	No
Released	Feb 2026	Sep 2023

GPT 5.3 Codex details →GPT-3.5 Turbo Instruct details →

FAQ

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