Grok 4.5 vs GPT-5.5 vs Claude Opus 4.8 vs Fable 5: A controlled coding benchmark
A comparison of four leading AI coding models — Grok 4.5, GPT-5.5, Claude Opus 4.8, and Claude Fable 5 — tasked with building the same three interactive HTML apps from a single prompt. The article evaluates each model's output quality, latency, and cost in a controlled one-shot test, declaring a winner based on performance metrics.
Key quotes
Grok 4.5 landed this week with xAI calling it their smartest model yet, 'trained alongside Cursor' for coding and agentic work.
We gave Grok 4.5, GPT-5.5, Claude Opus 4.8, and Claude Fable 5 the exact same three prompts: build a single self-contained HTML file (no libraries, no network calls) for an interactive app.
One shot each, no hand-holding, no prompt-fiddling.
From the article
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