Is Claude Haiku 4.5 or GPT-5.1 Codex Max cheaper?

Claude Haiku 4.5 is cheaper on output tokens ($5.00 vs $10.00 per 1M).

Which has the larger context window, Claude Haiku 4.5 or GPT-5.1 Codex Max?

GPT-5.1 Codex Max has the larger context window (400K tokens).

Claude Haiku 4.5 vs GPT-5.1 Codex Max

Claude Haiku 4.5 is cheaper on output tokens, while GPT-5.1 Codex Max offers a larger context window. Choose Claude Haiku 4.5 or GPT-5.1 Codex Max based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Haiku 4.5	GPT-5.1 Codex Max
Provider	Abacus	Abacus
Input / 1M tokens	$1.00	$1.25
Output / 1M tokens	$5.00	$10.00
Context window	200K	400K
Parameters	—	—
Open weights	No	No
Released	Oct 2025	Nov 2025

Claude Haiku 4.5 details →GPT-5.1 Codex Max details →

FAQ

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