Is Claude Sonnet 4 or GPT-5.3 Codex cheaper?

GPT-5.3 Codex is cheaper on output tokens ($14.00 vs $15.00 per 1M).

Which has the larger context window, Claude Sonnet 4 or GPT-5.3 Codex?

Claude Sonnet 4 has the larger context window (1M tokens).

Claude Sonnet 4 vs GPT-5.3 Codex

GPT-5.3 Codex is cheaper on output tokens, while Claude Sonnet 4 offers a larger context window. Choose Claude Sonnet 4 or GPT-5.3 Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Sonnet 4	GPT-5.3 Codex
Provider	OpenRouter	OpenRouter
Input / 1M tokens	$3.00	$1.75
Output / 1M tokens	$15.00	$14.00
Context window	1M	400K
Parameters	—	—
Open weights	No	No
Released	May 2025	Feb 2026

Claude Sonnet 4 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.