Key Differences
- •GPT-5.4 has a larger context window (1M vs 400k tokens)
- •GPT-5.3 Codex is more affordable for input ($1.75 vs $2.50/1M tokens)
- •GPT-5.3 Codex is more affordable for output ($14.00 vs $15.00/1M tokens)
- •GPT-5.4 is newer (released Mar 2026)
400k tokens
Context
1M tokens
Aug 2025
Knowledge
Aug 2025
Feb 2026
Released
Mar 2026
$1.75/1M
Input
$2.50/1M
$14.00/1M
Output
$15.00/1M
Both GPT-5.3 Codex and GPT-5.4 are available on Zo Computer. Try them both to see which one works best for your use case.