Fable 5 absolutely crushed the HTML5 physics contest, but cost 6x more than Opus 4.8 and 39× more than GLM 5.2 in that t…
Rohan Paul Twitter · Rohan Paul (@rohanpaul_ai) · 2026-07-01
A benchmark run on atomic.chat finds Claude Fable 5 produces the best HTML5 canvas physics simulations across four LLMs but costs $3.12 per run—6x more than Opus 4.8 and 39x more than GLM 5.2.
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Extraction
Topics: llm-benchmarkscode-generationllm-cost-comparisonclaude-fable-5
Claims
- Fable 5 earned an A+ on all three HTML5 physics scenes, outperforming GPT 5.5, Opus 4.8, and GLM 5.2 on quality.
- Fable 5 generated 62,158 tokens at $3.12, making it 6x more expensive than Opus 4.8 and 39x more expensive than GLM 5.2.
- GLM 5.2 was the cheapest option at $0.08 but did not win any individual scene.
- GPT 5.5 was the second-best in overall quality, outperforming Fable 5 slightly in the Bigfoot monster-truck scene.
Key quotes
Fable 5 absolutely crushed the HTML5 physics contest, but cost 6x more than Opus 4.8 and 39× more than GLM 5.2 in that test.
Fable is the best pick for quality, but you pay more for it.