name = "GPT-5.3 Codex"
description = "Coding-optimized GPT model for repository edits, reviews, and agentic software work"
family = "gpt"
release_date = "2026-02-15"
last_updated = "2026-02-15"
attachment = true
reasoning = true
reasoning_options = [{ type = "effort", values = ["low", "medium", "high"] }]
temperature = false
knowledge = "2026-01-31"
tool_call = true
open_weights = false

[cost]
input = 1.75
output = 14
cache_read = 0.175

[limit]
context = 400_000
output = 128_000

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