Is GPT-5.3 Chat or GPT-5.3 Codex cheaper?

GPT-5.3 Chat and GPT-5.3 Codex have comparable output pricing.

Which has the larger context window, GPT-5.3 Chat or GPT-5.3 Codex?

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

GPT-5.3 Chat vs GPT-5.3 Codex

Both have similar output pricing, while GPT-5.3 Codex offers a larger context window. Choose GPT-5.3 Chat or GPT-5.3 Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.3 Chat	GPT-5.3 Codex
Provider	OpenRouter	OpenRouter
Input / 1M tokens	$1.75	$1.75
Output / 1M tokens	$14.00	$14.00
Context window	128K	400K
Parameters	—	—
Open weights	No	No
Released	Mar 2026	Feb 2026

GPT-5.3 Chat details →GPT-5.3 Codex details →

FAQ

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