# OpenAI rolls out major ChatGPT upgrade: new Luna and Sol models

> OpenAI is pushing a broad ChatGPT update, and unusually the free tier gets the headline. GPT-5.6 Luna becomes the default for Free and Go users, replacing GPT-5.5, while Plus and Pro subscribers get the faster GPT-5.6 Sol for tasks like research and writing. A new Think button lets anyone dial up reasoning power for harder questions rather than guessing which model to pick. OpenAI says testing showed factual errors dropping 62 percent for Luna and 68 percent for Sol against the older GPT-5.5-Instant, and it is lifting text-chat limits for free users. The context for all of this is scale, since ChatGPT recently crossed one billion weekly users. The interesting move is strategic. By putting a genuinely stronger model in front of non-paying users, OpenAI is treating reach as the moat, betting that ubiquity plus lower error rates keeps it the default AI habit for a billion people even as cheaper rivals crowd in.

_Section: [Daily AI Updates](https://www.wortins.com/daily-ai) · Source: BleepingComputer · Published Saturday, August 8, 2026_

## Wortins' read

OpenAI is pushing a broad ChatGPT update, and unusually the free tier gets the headline. GPT-5.6 Luna becomes the default for Free and Go users, replacing GPT-5.5, while Plus and Pro subscribers get the faster GPT-5.6 Sol for tasks like research and writing. A new Think button lets anyone dial up reasoning power for harder questions rather than guessing which model to pick. OpenAI says testing showed factual errors dropping 62 percent for Luna and 68 percent for Sol against the older GPT-5.5-Instant, and it is lifting text-chat limits for free users. The context for all of this is scale, since ChatGPT recently crossed one billion weekly users. The interesting move is strategic. By putting a genuinely stronger model in front of non-paying users, OpenAI is treating reach as the moat, betting that ubiquity plus lower error rates keeps it the default AI habit for a billion people even as cheaper rivals crowd in.

## Source

[Read the full story at BleepingComputer](https://www.bleepingcomputer.com/news/artificial-intelligence/openai-rolls-out-a-major-chatgpt-upgrade-even-if-you-dont-pay-for-it/)

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