OpenAI GPT‑5.6 model improvements and free‑tier expansion

OpenAI announced an upgrade to its GPT-5.6 Sol model, boosting accuracy and consistency, and will extend unlimited daily chats with GPT-5.6 Luna to free‑tier users.

One continuously updated timeline instead of dozens of separate articles. New developments are appended as the story evolves.

1. AnnouncementAug 6, 2026, 10:00 AM

   OpenAI upgrades GPT‑5.6 Sol for better performance and opens unlimited Luna chats to free users

   OpenAI announced an upgrade to its GPT-5.6 Sol model, boosting accuracy and consistency, and will extend unlimited daily chats with GPT-5.6 Luna to free‑tier users.

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2. 1 week later
   UpdateAug 13, 2026, 11:00 AM

   OpenAI launches GPT-5.6 with new model selection tools and Responses API for AI agent development.

   OpenAI’s latest GPT-5.6 update introduces new model selection tools and a Responses API to help startups build faster and more cost-effective AI agents.

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