GPT 5.5 Pro
LatestOpenAI
•
Proprietary# 8
Released
Apr 23, 2026
# 1
Knowledge Cutoff
Dec 25
# 3
Context Length
1M
Benchmarks
# 2
Code RankedAGI
89.2%
# 2
Agentic RankedAGI
89.7%
# 1
Browse Comp
90.1%
# 5
Reason RankedAGI
83.0%
# 7
HLE
43.1%
# 5
HLE w/ Tools
57.2%
# 77
Math RankedAGI
66.3%
# 2
RAGI RankedAGI
75.0%
# 3
ARC AGI 2.0
84.2%
Pricing
# 47
Input Cost /M
$30
# 55
Output Cost /M
$180