OpenAI updates the default model for free users to GPT-5.6 Luna, adds unlimited text chats for free users, rolls out an improved GPT-5.6 Sol version, and more
OpenAI on Thursday announced a series of changes that will upgrade ChatGPT for both paid and free users.
AxiosHerb Scribner
Context & Ripple Effects
OpenAI's broad GPT-5.6 release and ChatGPT Work launch established the new model family across consumer and work-oriented products. Making Luna the free default and removing text-chat limits now pushes that release more fully into ChatGPT's no-cost tier.
Free ChatGPT users receive GPT-5.6 Luna by default and can continue text conversations without a usage cap.
OpenAI updates GPT-5.6 Sol alongside the free-tier change, giving the company two separately positioned GPT-5.6 variants.
Second-order effects
OpenAI's consumer product team must make model choice and capability differences legible as unlimited basic text access becomes the default experience.
The expanded free baseline gives users a lower-friction entry point to the GPT-5.6 ecosystem introduced with ChatGPT Work, potentially widening the pool familiar with OpenAI's newer tools.
Third-order effects
If OpenAI sustains unlimited access to a default frontier-model variant, ChatGPT's tiering is likely to depend less on basic chat scarcity and more on differentiated models and work-oriented capabilities.
The pattern moves frontier-model access governance from hard free-use limits toward product-level segmentation between default and upgraded experiences.
The trend: OpenAI is broadening free access to its latest model family while differentiating ChatGPT through model variants and work-oriented surfaces.
GPT-5.6 System Card has been updated. https://cdn.openai.com/... The new slider is live for me already. They also said they are 'bringing ChatGPT's Instant and Thinking experiences closer together' to create a more consistent feel. [image]
Oh big part is for free users, GPT 5.6 Luna is unlimited. No more usage limits for free users. Just for file uploads and whatnot. Given how good GPT 5.6 Luna is, that's pretty insane
Plus and Pro users can access the updated version of GPT-5.6 Sol in ChatGPT along with the new slider starting today. This version of GPT-5.6 Sol is for everyday chats, so it will only be available in the Chat experience in ChatGPT. The version of GPT-5.6 Sol that powers Work
Plus and Pro users also now have a slider to choose how much reasoning effort ChatGPT puts into each response. We think it's easier to use, and we're listening to your feedback. [video]
The new GPT-5.6 Sol powers all chats for paid users, including Instant, creating one consistent experience. In our high-stakes factuality evaluation covering finance, medicine and law, the new GPT-5.6 Sol produced 68% fewer responses with factual errors than GPT-5.5 Instant. [ima…
We're making better intelligence easier to access in ChatGPT for everyone: - GPT-5.6 Sol now powers both Instant and deep reasoning for Plus & Pro users, delivering more factual, focused responses. - Free & Go users get unlimited text chats with GPT-5.6 Luna starting tomorrow. [v…
The biggest story in AI today should be that everyone can get unlimited GPT-5.6 Luna messages for free That's approximately Opus 4.6 level intelligence for free Intelligence too cheap to meter https://openai.com/... [image]
OpenAI is working hard to empower everyone with intelligence that works for them, in the form of great products which get simpler to use over time. We're bringing unlimited text chats with Luna, a quite capable model, to free users. We've also released an updated version of Sol
Giving free ChatGPT users access to reasoning (a ‘Think’ toggle) will have a broader impact on the world than every new paid model and coding agent combined. [image]
really proud to see GPT5.6 make stronger intelligence more accessible for all and especially proud that this launch includes meaningful safety gains for under-18 users a huge amount of thoughtful work went into this!