Web Clone Bench
Agent gets a running reference app (Gmail, Jira, Figma, etc.) and 8 hours to build a clone. Expert-written workflows are replayed as end-to-end tests.
9 apps. Shipping the reference's own bundles scores zero. Environments are available through partnership.
- Made by
- Plato
- Released
- October 2026
- Kind
- Building whole projects
- Level
- Research frontier
- Scored
- Checked automatically
- Answers
- Code
- Tasks
- Kept private
- Strongest model tested
- Claude Fable 5.2 #1 on the capability index
- Last model added
- November 2026
- Scores refreshed
- November 12th, 2026
Claude Fable 5.2 leads with 62%
Best score per model from the benchmark's own leaderboard, read on November 12th, 2026. Where a model ran with several settings or harnesses, we keep its best. Every run is in the next chart.
- 1 Claude Fable 5.2 low 62%
- 2 Claude Opus 5.5 xhigh 34.2%
- 3 GPT-6 Astra max 17.5%
- 4 Claude Fable 5.1 high 13.3%
- 5 GPT-6.1 Sol max 12.6%
- 6
Gemini 4 Argon medium 8.60% - 7
Muse Wonder high 3.70% - 8 Grok 4.7 low 2.80%
- 9 Muse Spark 1.3 medium 1.50%
- 10 Gemini 3.8 Flash medium 1.00%
Source: Official Web Clone Bench leaderboard
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Claude Fable 5.2 | 62% | low | Nov 2026 | Official leaderboard |
| 2 | Claude Opus 5.5 | 34.2% | xhigh | Sep 2026 | Official leaderboard |
| 3 | GPT-6 Astra | 17.5% | max | Sep 2026 | Official leaderboard |
| 4 | Claude Fable 5.1 | 13.3% | high | Sep 2026 | Official leaderboard |
| 5 | GPT-6.1 Sol | 12.6% | max | Sep 2026 | Official leaderboard |
| 6 | Gemini 4 Argon | 8.60% | medium | Sep 2026 | Official leaderboard |
| 7 | Muse Wonder | 3.70% | high | Oct 2026 | Official leaderboard |
| 8 | Grok 4.7 | 2.80% | low | Sep 2026 | Official leaderboard |
| 9 | Muse Spark 1.3 | 1.50% | medium | Sep 2026 | Official leaderboard |
| 10 | Gemini 3.8 Flash | 1.00% | medium | Sep 2026 | Official leaderboard |
The best score, 62%, costs $431 a task
Runs on the cost frontier score higher than any run that's cheaper. The costs are the leaderboard's own estimates, so compare them only within this benchmark.
Source: Official Web Clone Bench leaderboard
| Model | Effort | Harness | Score | Cost per task | Output tokens |
|---|---|---|---|---|---|
| Claude Fable 5.2 | low | 62% | $431 | ||
| Claude Fable 5.2 | medium | 58.3% | $536 | ||
| Claude Fable 5.2 | high | 52.5% | $741 | ||
| Claude Fable 5.2 | xhigh | 48.7% | $812 | ||
| Claude Fable 5.2 | max | 47% | $723 | ||
| Claude Opus 5.5 | xhigh | 34.2% | $652 | ||
| Claude Opus 5.5 | max | 32.3% | $719 | ||
| Claude Opus 5.5 | high | 30.5% | $547 | ||
| Claude Opus 5.5 | medium | 18.6% | $404 | ||
| GPT-6 Astra | max | 17.5% | $207 | ||
| Claude Fable 5.1 | high | 13.3% | $272 | ||
| Claude Fable 5.1 | xhigh | 13% | $314 | ||
| GPT-6.1 Sol | max | 12.6% | $25 | ||
| GPT-6 Astra | xhigh | 11.8% | $117 | ||
| Claude Fable 5.1 | max | 11.6% | $228 | ||
| GPT-6 Astra | high | 10% | $75 | ||
| GPT-6.1 Sol | high | 9.90% | $14 | ||
| GPT-6 Astra | medium | 9.60% | $46 | ||
| Claude Fable 5.1 | low | 9.20% | $175 | ||
| Claude Fable 5.1 | medium | 9.10% | $207 | ||
| GPT-6.1 Sol | xhigh | 8.60% | $17 | ||
| Gemini 4 Argon | medium | 8.60% | $89 | ||
| GPT-6 Astra | low | 7.80% | $31 | ||
| GPT-6.1 Sol | medium | 6.90% | $5.80 | ||
| Gemini 4 Argon | high | 6.30% | $49 | ||
| GPT-6.1 Sol | low | 4.60% | $2.49 | ||
| Muse Wonder | high | 3.70% | $8.60 | ||
| Gemini 4 Argon | low | 3.30% | $39 | ||
| Muse Wonder | xhigh | 2.90% | $6.81 | ||
| Grok 4.7 | low | 2.80% | $18 | ||
| Grok 4.7 | high | 2.70% | $19 | ||
| Claude Opus 5.5 | low | 2.40% | $17 | ||
| Grok 4.7 | medium | 2.10% | $16 | ||
| Muse Wonder | max | 2.00% | $14 | ||
| Muse Spark 1.3 | medium | 1.50% | $5.46 | ||
| Gemini 3.8 Flash | medium | 1.00% | $2.01 | ||
| Muse Spark 1.3 | low | 0.90% | $1.89 | ||
| Gemini 3.8 Flash | high | 0.50% | $2.72 | ||
| Gemini 3.8 Flash | low | 0.20% | $1.66 | ||
| Muse Spark 1.3 | high | 0.20% | $4.20 |
2 models have held number one on the official leaderboard since its release in October 2026
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Official Web Clone Bench leaderboard
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Source: Official Web Clone Bench leaderboard
No lab model card reports it yet
We read the headline results of 522 launch posts from 52 labs, and none of them list this benchmark.
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