CC-Bench-V2 Frontend

Claude Opus 4.5 75.7% leads since February 2026

Fading

Labs’ own numbers All independent runs Include claimed scores

Agents build web projects in HTML, React, Vue, Svelte and Next.js. A GUI judge agent tests each check item in the running app.

In-house Z.ai evaluation. Reported as build success, instance success and check-item success rates.

Made by: Zhipu AI (Z.ai)
Released: February 2026
Kind: Web and app front ends
Level: Expert
Scored: Graded by a model
Answers: Agent task
Tasks: Kept private

Strongest model tested: Claude Opus 4.5 #61 on the capability index
Last in a launch post: April 2026, dropped before it saturated
Last model added: April 2026
Scores refreshed: November 12th, 2026

Paper arxiv.org

Models scored in lab cards

Launch post lists it, from 1 lab

System card reports it, from 1 lab

GLM-5 leads with 74.8%

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.

Claude Opus 4.5 leads with 75.7% across all independent runs

Best score per model across the official leaderboard, Epoch AI’s own runs and any board Epoch AI copied. Each bar and row names its source.

Claude Opus 4.5 leads with 75.7%, claims included

Best score per model from every source, including labs’ own numbers and claims Epoch AI collected from reports and papers. Labs pick their own settings, so a claim can beat an independent run of the same model.

Bars Table

1 GLM-5 74.8%
2 GLM-5V-Turbo 68.4%

Source: Labs’ model cards

1 Claude Opus 4.5 75.7%
2 GLM-5 74.8%

Source: Official CC-Bench-V2 Frontend leaderboard

1 Claude Opus 4.5 75.7%
2 GLM-5 74.8%
3 GLM-5V-Turbo 68.4%

Sources: Official CC-Bench-V2 Frontend leaderboard and labs’ model cards

#	Model	Score	Setting	Date	Source
1	GLM-5	74.8%		Feb 2026	Lab model card
2	GLM-5V-Turbo	68.4%		Apr 2026	Lab model card

#	Model	Score	Setting	Date	Source
1	Claude Opus 4.5	75.7%		Nov 2025	Official leaderboard
2	GLM-5	74.8%		Feb 2026	Official leaderboard

#	Model	Score	Date	Source
1	Claude Opus 4.5	75.7%	Nov 2025	Official leaderboard
2	GLM-5	74.8%	Feb 2026	Official leaderboard
3	GLM-5V-Turbo	68.4%	Apr 2026	Lab model card

The benchmark's own leaderboard has 2 models. Switch the scores above to rank them together.

Scores over time

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

On the benchmark’s own leaderboard Reported by the lab in its model card

Sources: Official CC-Bench-V2 Frontend leaderboard and labs’ model cards

Labs headline it less often now, last in April 2026

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.

Z.ai

Date	Launch post	Score	As the post writes it
Apr 1, 2026	GLM-5V-Turbo	68.4	CC-Frontend 68.4

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
Feb 17, 2026	GLM-5 technical report	74.8	CC-Bench-V2 Frontend, End-to-End Correctness (Figure 4). Build Success Rate 98.0; per-stack ISR/CSR in Table 8	Capabilities

One lab claim next to the leaderboard

Each score a lab reported for its own model, beside the same model's best score on the leaderboard. Gaps mostly come from different harnesses, effort levels and task subsets. 1 of them match, which usually means one side copied the other. Every benchmark.

Model	Lab says	Board says	Gap
GLM-5	74.8% CC-Bench-V2 Frontend, End-to-End Correctness (Figure 4). Build Success Rate 98.0; per-stack ISR/CSR in Table 8	74.8% Leaderboard	Same