Is GPT-5.3 Codex or Claude Opus 4.8 cheaper?

GPT-5.3 Codex is cheaper on output tokens ($14.00 vs $25.00 per 1M).

Which has the larger context window, GPT-5.3 Codex or Claude Opus 4.8?

Claude Opus 4.8 has the larger context window (1M tokens).

GPT-5.3 Codex vs Claude Opus 4.8

GPT-5.3 Codex is cheaper on output tokens, while Claude Opus 4.8 offers a larger context window. Choose GPT-5.3 Codex or Claude Opus 4.8 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.3 Codex	Claude Opus 4.8
Provider	FreeModel	FreeModel
Input / 1M tokens	$1.75	$5.00
Output / 1M tokens	$14.00	$25.00
Context window	400K	1M
Parameters	—	—
Open weights	No	No
Released	Feb 2026	May 2026

GPT-5.3 Codex details →Claude Opus 4.8 details →

FAQ

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