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OpenAI launched GPT-5.6 with three tiers, Sol, Terra, Luna, and ChatGPT Work, an agent that automates multi-step tasks across apps and files. The flagship Sol model nearly matches Anthropic's Claude Fable 5 on the AI Index while costing one-third less. Codex is merged into a revamped ChatGPT desktop app with a built-in browser and computer control.
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