Is GPT-5.3 Codex or Seed 1.6 Flash cheaper?

Seed 1.6 Flash is cheaper on output tokens ($0.41 vs $38.51 per 1M).

Which has the larger context window, GPT-5.3 Codex or Seed 1.6 Flash?

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

GPT-5.3 Codex vs Seed 1.6 Flash

Seed 1.6 Flash is cheaper on output tokens, while GPT-5.3 Codex offers a larger context window. Choose GPT-5.3 Codex or Seed 1.6 Flash based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.3 Codex	Seed 1.6 Flash
Provider	AI/ML API	AI/ML API
Input / 1M tokens	$4.81	$0.10
Output / 1M tokens	$38.51	$0.41
Context window	400K	262K
Parameters	—	—
Open weights	No	No
Released	Feb 2026	Aug 2025

GPT-5.3 Codex details →Seed 1.6 Flash details →

FAQ

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