Claude Opus 4.5 (latest) vs GPT-5-Codex: API price and specs

GPT-5-Codex is 57% cheaper than Claude Opus 4.5 (latest) on input price.

GPT-5-Codex is 32% cheaper than Claude Opus 4.5 (latest) on output price.

GPT-5-Codex is 45% cheaper than Claude Opus 4.5 (latest) on a 1M-in / 200k-out workload.

GPT-5-Codex has a 100% larger context than Claude Opus 4.5 (latest).

Field	Claude Opus 4.5 (latest)	GPT-5-Codex
Lowest input, per 1M	$2.50 +133.6%	$1.07
Median input, per 1M	$5.00 +300%	$1.25
Lowest output, per 1M	$12.50 +47.1%	$8.50
Median output, per 1M	$25.00 +150%	$10.00
Lowest unit price	—	—
Cost of 1M in + 200k out	$5.00 +80.5%	$2.77
Context	200K +50%	400K
Max output	66K +48.8%	128K
Providers	30	10 +66.7%
Regions	EU, GLOBAL, US	GLOBAL
Accepts	application/pdf, file, image, image/gif, image/jpeg, image/png, image/webp, pdf, text	file, image, pdf, text
Returns	text	text
Type	Text models	Text models
Free option	no	no
Cheapest provider	openrouter	opencode

Your own workload: how many tokens the model gets (input) and gives back (output) - for example, in a month. The "Cost" row of the table above is recalculated for these numbers, for each model.

Computed from current offers each time the page opens; the best value of a row is bold, the percent is how far behind the best.

Providers selling both

aihubmix, azure, edenai, helicone, impossibl, jiekou, opencode, poe, vercel, zenmux

Frequently asked questions

Which is cheaper, Claude Opus 4.5 (latest) or GPT-5-Codex?

GPT-5-Codex is 57% cheaper than Claude Opus 4.5 (latest) on input price. GPT-5-Codex is 32% cheaper than Claude Opus 4.5 (latest) on output price. GPT-5-Codex is 45% cheaper than Claude Opus 4.5 (latest) on a 1M-in / 200k-out workload.

Which has the larger context, Claude Opus 4.5 (latest) or GPT-5-Codex?

Claude Opus 4.5 (latest): 200K tokens; GPT-5-Codex: 400K tokens.

Where can I use both Claude Opus 4.5 (latest) and GPT-5-Codex?

aihubmix, azure, edenai, helicone, impossibl, jiekou, opencode, poe, vercel, zenmux