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But you don't get Fable on Claude 20 USD plan, then why compare it Sol on Codex 20 USD?

Sol is OpenAI's Opus, and Astra is OpenAI's Fable. Both pricing-wise, and performance-wise.

Sol is their middle model. Luna is smallest. And Astra is big, their Fable equivalent.

My code review benchmark put Sol 5.6 on the same performance tier as Fable 5.