Is GPT-5.4 mini or Claude Opus 5.5 cheaper?

GPT-5.4 mini is cheaper on output tokens ($4.50 vs $20.00 per 1M).

Which has the larger context window, GPT-5.4 mini or Claude Opus 5.5?

Claude Opus 5.5 has the larger context window (1M tokens).

GPT-5.4 mini vs Claude Opus 5.5

GPT-5.4 mini is cheaper on output tokens, while Claude Opus 5.5 offers a larger context window. Choose GPT-5.4 mini or Claude Opus 5.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.4 mini	Claude Opus 5.5
Provider	CrossModel	CrossModel
Input / 1M tokens	$0.75	$4.00
Output / 1M tokens	$4.50	$20.00
Context window	400K	1M
Parameters	—	—
Open weights	No	No
Released	Mar 2026	Sep 2026

GPT-5.4 mini details →Claude Opus 5.5 details →

FAQ

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