Is Claude Sonnet 4.6 or GPT-5.1-Codex cheaper?

GPT-5.1-Codex is cheaper on output tokens ($10.00 vs $15.00 per 1M).

Which has the larger context window, Claude Sonnet 4.6 or GPT-5.1-Codex?

Claude Sonnet 4.6 has the larger context window (1M tokens).

Claude Sonnet 4.6 vs GPT-5.1-Codex

GPT-5.1-Codex is cheaper on output tokens, while Claude Sonnet 4.6 offers a larger context window. Choose Claude Sonnet 4.6 or GPT-5.1-Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Sonnet 4.6	GPT-5.1-Codex
Provider	ZenMux	ZenMux
Input / 1M tokens	$3.00	$1.25
Output / 1M tokens	$15.00	$10.00
Context window	1M	400K
Parameters	—	—
Open weights	No	No
Released	Feb 2026	Nov 2025

Claude Sonnet 4.6 details →GPT-5.1-Codex details →

FAQ

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