name = "GPT-5.5 Pro"
description = "Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding"
family = "gpt-pro"
release_date = "2026-04-23"
last_updated = "2026-04-23"
attachment = true
reasoning = true
reasoning_options = [{ type = "effort", values = ["medium", "high", "xhigh"] }]
temperature = false
knowledge = "2025-12-01"
tool_call = true
structured_output = true
open_weights = false

[cost]
input = 30.00
output = 180.00

[[cost.tiers]]
tier = { size = 272_000 }
input = 60.00
output = 270.00

[limit]
context = 1_050_000
input = 922_000
output = 128_000

[modalities]
input = ["text", "image", "pdf"]
output = ["text"]