name = "Step 5 Preview"
description = "StepFun's next-generation flagship base model for coding and professional knowledge work, with native text, image, and video input and a 1M-token context window"
# release_date is StepFun's API catalog first-appearance timestamp (created=1789564127,
# 2026-09-16 13:08 UTC) — no dated launch announcement was found on the model docs page.
release_date = "2026-09-16"
last_updated = "2026-09-20"
attachment = true
reasoning = true
tool_call = true
structured_output = true
open_weights = false

[limit]
context = 1_000_000
input = 1_000_000
output = 1_000_000

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