U-Artifacts

Fading

Models build interactive artifacts such as small apps and pages for 199 cases across 13 topics. A GUI agent simulates a non-expert user to grade interactivity, looks and fit to the need.

In-house Seed benchmark with four task families. It is a different test from Tencent ArtifactsBench.

Made by: ByteDance Seed
Released: December 2025
Kind: Web and app front ends
Level: Everyday
Scored: Graded by a model
Answers: Open-ended
Tasks: Kept private

Last in a launch post: December 2025, dropped before it saturated
Last model added: March 2026

Paper lf3-static.bytednsdoc.com

Model scored in lab cards

Launch post lists it, from 1 lab

System card reports it, from 1 lab

Seed1.8 leads with 49.2%

Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.

Bars Table

49.2 Seed1.8

1 Seed1.8 49.2%

Source: Labs’ model cards

#	Model	Score	Setting	Date	Source
1	Seed1.8	49.2%		Dec 2025	Lab model card

Scores over time

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Reported by the lab in its model card

Source: Labs’ model cards

Labs headline it less often now, last in December 2025

Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.

ByteDance Seed

Date	Launch post	Score	As the post writes it
Dec 18, 2025	Seed1.8	49.2	U-Artifacts

One system card reports it

Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.

Date	Document	Score	As the document writes it	Section
Mar 21, 2026	Seed1.8 model card	49.2	U-Artifacts (Table 4)	Capabilities

Seed1.8 leads with 49.2%

Scores over time

Labs headline it less often now, last in December 2025

One system card reports it

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