GPT 5.5
LatestOpenAI
•
Proprietary# 17
Released
Apr 23, 2026
# 1
Knowledge Cutoff
Dec 25
# 3
Context Length
1M
Benchmarks
# 7
Code RankedAGI
85.9%
# 10
SWEBench Pro
58.6%
# 4
Terminal Bench 2.1
83.4%
# 1
Terminal Bench 2.0
82.7%
# 17
Agentic RankedAGI
75.6%
# 6
Browse Comp
84.4%
# 11
Code Arena
1502
# 4
Code Livebench
82.5%
# 1
DeepSWE
70.0%
# 7
AgenticCode LiveBench
56.7%
# 5
OSWorld Verified
78.7%
# 3
Svelte Bench
97.8%
# 2
Cyber Gym
81.8%
# 4
Reason RankedAGI
84.7%
# 12
HLE
41.4%
# 14
HLE w/ Tools
52.2%
# 5
GPQA Diamond
93.6%
# 6
Text Arena
1481
# 3
Vending Bench 2
$7,523.84
# 3
MMMU Pro
81.2%
# 1
MMMU Pro w/ Tools
83.2%
# 34
Math RankedAGI
72.0%
# 8
RAGI RankedAGI
72.1%
# 1
ARC AGI 2.0
85.0%
# 3
𝜏²-Bench Telecom
98.0%
# 7
MCP Atlas
75.3%
# 4
Finance Agent
60.0%
# 15
Code DesignArena
1296
# 4
Toolathlon Pass@1
55.6%
# 2
Cursor Bench 3.1
64.3%
Pricing
# 41
Input Cost /M
$5
# 48
Output Cost /M
$30
# 27
Cached Cost /M
$0.5