Sebastian Raschka • 7/10/2026

GPT 5.6 Has 72 Possible Configurations. What's A Good Default?

This article explores the 72 possible configurations of the GPT 5.6 model, breaking down the options into model choices (Sol, Terra, Luna), reasoning-effort levels (Light to Ultra), and modes (Work/Codex, Standard/Fast). It maps these to training-time and inference-time scaling concepts from OpenAI's o1 plots, and discusses how to choose a good default configuration based on performance versus cost trade-offs, using the Artificial Analysis Coding Agent Index v1.1 scores.

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#Gpt #Language Models #Reasoning