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OpenAI Launches GPT-5.6 Sol, Squaring Off With Claude Fable 5 on Cost and Performance

  • Foundation Models
  • AI Agents
  • Software Dev & Coding

OpenAI began general availability of its new "GPT-5.6" model family around July 9, 2026. The flagship "GPT-5.6 Sol" posts strong scores in coding and autonomous agent tasks while priced at roughly a third of Anthropic's "Claude Fable 5," setting up a head-to-head contest on both capability and cost efficiency.

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