I've been trying Fable 5 and GPT 5.6 Sol last few days. My impression is that Sol consumes a lot less tokens that Fable 5 being comparable. Gpt 5.6 Sol can be run sustainably on one 20x plan. Fable 5 requires 2-3 20x plans to be run sustainably. I think the best move move for Anthropic would be to release an Opus 5 that is actually as cheap as Sol and comparably good. They have released a Fable 5 and Sonnet 5 so that seems like a possible move but I'm not sure whether the Opus 5 they got is already at Sol level. Claude Code terminal is still better than Codex CLI though as an harness. Claude code Ultramode + workflow is unmatched by Codex harness yet in my experience.