Simon Willison Benchmarks Codex Desktop Sub-Agents in 3D Game Vibe Coding
Simon Willison tested Codex Desktop using GPT-5.6 Sol Ultra in aggressive sub-agent mode to construct a complete 3D web game from a single prompt. While Codex coordinated sub-agents and generated visual assets using gpt-image-2, it failed to fix visual rendering bugs during screenshot self-inspection.
Why it matters
Simon Willison tested Codex Desktop using GPT-5.6 Sol Ultra in aggressive sub-agent mode to construct a complete 3D web game from a single prompt. While Codex coordinated sub-agents and generated visual assets using gpt-image-2, it failed to fix visual rendering bugs during screenshot self-inspection.
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