name = "GPT-5.1 Chat"
description = "Speech generation model for controllable voice, narration, and audio delivery"
family = "gpt-codex"
release_date = "2025-11-14"
last_updated = "2025-11-14"
attachment = true
reasoning = true
reasoning_options = [{ type = "effort", values = ["medium"] }]
temperature = false
knowledge = "2024-09-30"
tool_call = true
structured_output = true
open_weights = false

[cost]
input = 1.25
output = 10.00
cache_read = 0.125

[limit]
context = 128_000
output = 16_384

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