OpenAI Updates ChatGPT with Enhanced GPT-5.6 Models and Deprecates Atlas Agentic Browser

OpenAI has rolled out significant updates to ChatGPT, including an enhanced GPT-5.6 Sol model for Plus and Pro users, offering more reliable facts and focused answers with an adjustable 'thought' slider. Furthermore, GPT-5.6 Luna is becoming the default model for Free and Go users, providing unlimited text chats and a new 'Think' button for complex queries. Concurrently, OpenAI is deprecating its Atlas agentic browser, integrating its browser-based agentic capabilities directly into ChatGPT and Codex, with Atlas scheduled to cease operations on August 9, 2026.