Arena Publishes Head-to-Head 3D Generation Tests of GPT-5.6 Sol and Fable 5

AI comparison platform Arena.ai (formerly LMArena) released a head-to-head 3D generation test in July 2026 pitting OpenAI's GPT-5.6 Sol against Anthropic's Claude Fable 5 across dozens of the hardest prompts. The test was built around a prompt collection assembled by AI practitioner Peter Gostev, side-by-side evaluating the visual output quality of both models. The prompts used are published on GitHub.