Is Seed 1.8 (251228) or GPT-5.3 Codex cheaper?

Seed 1.8 (251228) is cheaper on output tokens ($2.00 vs $14.00 per 1M).

Which has the larger context window, Seed 1.8 (251228) or GPT-5.3 Codex?

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

Seed 1.8 (251228) vs GPT-5.3 Codex

Seed 1.8 (251228) is cheaper on output tokens, while GPT-5.3 Codex offers a larger context window. Choose Seed 1.8 (251228) or GPT-5.3 Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Seed 1.8 (251228)	GPT-5.3 Codex
Provider	LLM Gateway	LLM Gateway
Input / 1M tokens	$0.25	$1.75
Output / 1M tokens	$2.00	$14.00
Context window	256K	400K
Parameters	—	—
Open weights	Yes	No
Released	Dec 2025	Feb 2026

Seed 1.8 (251228) 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.