Claude Code Fable and GPT-5.6 Sol compared for coding and workflow use

GPT-5.6 Sol is OpenAI’s flagship model in the GPT‑5.6 family, intended for a broad range of professional tasks including coding, research, design and multi‑step agentic work. A promotional API rate of $4 per million input tokens and $20 per million output tokens runs until at least November 21 2026. The author recommends treating the two as complementary: use Claude Code Fable for tasks that require deep reasoning and high‑precision review, and use GPT‑5.6 Sol for fast, high‑volume work such as idea generation, summarisation, and bulk code fixes. The guide suggests a role‑based approach—Director, Expert, Worker—to decide which model to call for each task and to track revisions, time and instruction count to refine the workflow over time.