Karl Livesey ยท coding https://livesey.io/tags/coding/ Posts filed under coding. GPT-5.6: Which Model and Effort Should You Actually Use? https://livesey.io/posts/gpt-5-6-sol-terra-luna-model-effort-guide/ urn:uuid:e616187a-b692-57af-986f-af8111e3a03e Sun, 12 Jul 2026 12:00:00 GMT GPT-5.6 is a meaningful step beyond GPT-5.5, but choosing well means using Terra by default, Sol deliberately, and Luna only for bounded work.