Key Differences
- •GPT-5.5 has a larger context window (1.1M vs 1M tokens)
- •GPT-5.5 has more recent training data (Dec 2025 vs Jan 2025)
- •Sonnet 4.5 is more affordable for input ($3.00 vs $5.00/1M tokens)
- •Sonnet 4.5 is more affordable for output ($15.00 vs $30.00/1M tokens)
- •GPT-5.5 is newer (released Apr 2026)
1.1M tokens
Context
1M tokens
Dec 2025
Knowledge
Jan 2025
Apr 2026
Released
Sep 2025
$5.00/1M
Input
$3.00/1M
$30.00/1M
Output
$15.00/1M
Both GPT-5.5 and Sonnet 4.5 are available on Zo Computer. Try them both to see which one works best for your use case.