name = "GPT-5.5"
description = "Default frontier GPT for coding, computer use, research, and knowledge work"
family = "gpt"
release_date = "2026-04-23"
last_updated = "2026-04-23"
attachment = true
reasoning = true
reasoning_options = [{ type = "effort", values = ["none", "low", "medium", "high", "xhigh"] }]
temperature = false
knowledge = "2025-12-01"
tool_call = true
structured_output = true
open_weights = false

[cost]
input = 5.00
output = 30.00
cache_read = 0.50

[[cost.tiers]]
tier = { size = 272_000 }
input = 10.00
output = 45.00
cache_read = 1.00

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

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

[experimental.modes.fast]
cost = { input = 12.50, output = 75.00, cache_read = 1.25 }
provider = { body = { service_tier = "priority" } }