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You don't get Fable on Claude 20 USD plan. You get Sol on equivalent Codex plan.

You meant Astra, not Sol, I think. But Opus 5.5 is slightly better than Fable and Astra now.

Indeed, it's Astra now and Sol before. All SOTA models are always available in their cheapest plan.

Opus 5.5 is better in benchmarks, but has substantially less parameters so is world knowledge cannot compare against Fable or Astra.