GPT 5.5 Pro
LatestOpenAI
•
Proprietary# 18
Released
Apr 23, 2026
# 1
Knowledge Cutoff
Dec 25
# 3
Context Length
1M
Benchmarks
# 6
Code RankedAGI
86.3%
# 3
Agentic RankedAGI
87.9%
# 2
Browse Comp
90.1%
# 7
Reason RankedAGI
82.6%
# 10
HLE
43.1%
# 7
HLE w/ Tools
57.2%
# 83
Math RankedAGI
65.0%
# 5
RAGI RankedAGI
73.9%
# 3
ARC AGI 2.0
84.2%
Pricing
# 48
Input Cost /M
$30
# 57
Output Cost /M
$180