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We made Grok 4.5, GPT-5.5, and Claude build the same apps
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Overview
Grok 4.5 has launched, described as xAI's smartest model yet and trained alongside Cursor for coding and agentic tasks. A build-off was conducted where Grok 4.5, GPT-5.5, Claude Opus 4.8, and Fable 5 created the same interactive apps, with results measured for latency and cost.
Summary from tryai.dev.
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Hacker News · tryai.dev
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Based on 5 sampled comments from this thread. Analyzed 2026-07-09.
- Praise: Impressive, especially the number of models used for the comparison — it really showcases the landscape of AI capabilities.
- Praise: This arena of 52 apps across 21 models is a goldmine for anyone interested in real-world AI performance metrics.
- Concern: Comparisons are completely subjective and the problem space is too simplistic for today's AI — it's like a kid trying to do science.
- Concern: The benchmarks seem cherry-picked, ignoring the nuances of what makes a model succeed or fail — not a reliable evaluation.
- Concern: I worry that newer models will be heavily restricted, which could mess up actual benchmarks and lead to misleading results.