GPT-5.5 Pro
openai/gpt-5.5-pro
Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding
Capabilities
ReasoningYes
Tool callingYes
Structured outputYes
TemperatureFixed
AttachmentYes
Open weightsNo
Limits
Context1,050,000 tokens
Max input922,000 tokens
Max output128,000 tokens
Details
Familygpt-pro
Knowledge cutoff2025-12-01
Release date2026-04-23
Last updated2026-04-23
Modalities
Inputtext, image, pdf
Outputtext
Benchmarks
BrowseComp
90.1
accuracy
Humanity's Last Exam
43.1
accuracy
Humanity's Last Exam
57.2
accuracy
FrontierMath
52.4
accuracy
FrontierMath
39.6
accuracy
GDPval
82.3
wins or ties
GeneBench
33.2
accuracy
Community Rating
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Pricing
Cost per 1M tokens
InputN/A
OutputN/A