GPT 5.5
LatestOpenAI
•
Proprietary# 4
Released
Apr 23, 2026
# 1
Knowledge Cutoff
Dec 25
# 3
Context Length
1M
Benchmarks
# 6
Code RankedAGI
85.5%
# 3
SWEBench Pro
58.6%
# 1
Terminal Bench 2.0
82.7%
# 5
Agentic RankedAGI
81.6%
# 5
Browse Comp
84.4%
# 7
Code Arena
1500
# 4
Code Livebench
82.5%
# 7
AgenticCode LiveBench
56.7%
# 2
OSWorld Verified
78.7%
# 3
Svelte Bench
97.8%
# 2
Cyber Gym
81.8%
# 3
Reason RankedAGI
83.4%
# 9
HLE
41.4%
# 10
HLE w/ Tools
52.2%
# 5
GPQA Diamond
93.6%
# 3
Text Arena
1488
# 3
Vending Bench 2
$7,523.84
# 2
MMMU Pro
81.2%
# 1
MMMU Pro w/ Tools
83.2%
# 32
Math RankedAGI
72.6%
# 5
RAGI RankedAGI
73.1%
# 1
ARC AGI 2.0
85.0%
# 3
𝜏²-Bench Telecom
98.0%
# 2
MCP Atlas
75.3%
# 4
Finance Agent
60.0%
# 8
Code DesignArena
1313
# 1
Toolathlon Pass@1
55.6%
Pricing
# 40
Input Cost /M
$5
# 46
Output Cost /M
$30
# 25
Cached Cost /M
$0.5