Is GPT-5.3 Codex or Kimi K2.5 cheaper?

Kimi K2.5 is cheaper on output tokens ($3.02 vs $14.00 per 1M).

Which has the larger context window, GPT-5.3 Codex or Kimi K2.5?

GPT-5.3 Codex has the larger context window (400K tokens).

GPT-5.3 Codex vs Kimi K2.5

Kimi K2.5 is cheaper on output tokens, while GPT-5.3 Codex offers a larger context window. Choose GPT-5.3 Codex or Kimi K2.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.3 Codex	Kimi K2.5
Provider	ZenMux	ZenMux
Input / 1M tokens	$1.75	$0.58
Output / 1M tokens	$14.00	$3.02
Context window	400K	262K
Parameters	—	1T
Open weights	No	No
Released	Mar 2026	Jan 2026

GPT-5.3 Codex details →Kimi K2.5 details →

FAQ

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