Developer-focused explainer on GPT-5.6 Sol. Covers what Sol's 80 Coding Agent Index (2.8 pts above Fable 5) means for real workflows, the ultra mode parallel subagent feature (model-side orchestration that splits complex tasks across parallel workers), the 54% token efficiency gain, and practical guidance on when to use Sol vs alternatives. NOT a benchmark table — a workflow decision guide for developers choosing AI coding tools.
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GPT-5.6 Sol: What OpenAI's New Flagship Model Means for Developer Workflows
on SitePoint.