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GPT-5.6 vs Fable 5 head-to-head puts focus on price and access

OpenAI has released GPT-5.6 in three variants, Sol, Terra and Luna, reshaping comparisons with Anthropic’s Fable 5. Benchmarks showed Sol leading in coding and efficiency, while Fable 5 remained stronger in writing and general conversation. With overall performance gaps narrow, pricing and access policies are becoming decisive factors. Fable 5’s pricing and access rules have changed repeatedly, and it is set to return to usage-based credit billing.