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.

Axios 2026-08-07 Herb Scribner

Context & Ripple Effects

OpenAI had already signaled a broader-access strategy by planning unlimited GPT-5 use at a standard setting for free users and, later, extending ChatGPT Projects to the free tier. The new default-model and chat-limit changes make that access model more concrete.

The update also follows the broad GPT-5.6 release and ChatGPT Work launch, which expanded ChatGPT from a chat product toward a workspace that can draw context from apps and files.

First-order effects

Free ChatGPT users receive GPT-5.6 Luna as their default model and can continue text conversations without a stated usage cap.
OpenAI upgrades paid and free ChatGPT experiences in parallel, including an improved GPT-5.6 Sol version.

Second-order effects

Removing the free text-chat constraint makes model choice, rather than message scarcity, a more prominent way for OpenAI to differentiate ChatGPT experiences.
The change extends OpenAI’s earlier free-access commitments, raising the baseline that ChatGPT users can expect before considering paid plans or work-oriented tools.

Third-order effects

If OpenAI keeps moving capable models and workspace features into the free tier, ChatGPT’s product structure will increasingly depend on differentiated model experiences and workflow surfaces rather than simple feature gates.
That direction makes ChatGPT Work’s cross-app context gathering more strategically important: OpenAI is building both a broad consumer entry point and a more specialized work layer.

The trend: OpenAI is widening the free ChatGPT baseline while differentiating its assistant through model variants and increasingly workflow-native capabilities.

Discussion

@openai @openai on x
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…
@andrewcurran_ Andrew Curran on x
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]
@sama Sam Altman on x
5.6 Sol much better in chat now and unlimited text chat for free users!
@gdb Greg Brockman on x
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
@openai @openai on x
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]
@openai @openai on x
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…
@openai @openai on x
In addition to the upgrade in intelligence with GPT-5.6 Luna, Free and Go users can now use the “Think” button for more reasoning on harder questions.
@angaisb_ Angel on x
Free users of ChatGPT will have UNLIMITED chats with GPT-5.6 Luna Awesome move! [image]
@techwithhannahm Hannah Mulvaney on x
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!
@heaney555 David Heaney on x
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]
@somewheresy @somewheresy on x
interesting, this is basically the opposite of what's going on at Anthropic
@mehulmpt Mehul Mohan on x
ChatGPT now has 1 billion (!) weekly active users They're also making GPT-5.6 Luna free for all free users with unlimited chats. [image]
@openai @openai on x
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
@_jason_dean_ Jason Dean on x
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]
@angaisb_ Angel on x
Finally I won't have to hear people say “ChatGPT is so dumb” Instant models made so much damage to public perception
@mweinbach Max Weinbach on x
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
r/OpenAI r on reddit
Improving GPT-5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free users
r/accelerate r on reddit
Improving GPT-5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free users
r/singularity r on reddit
OpenAI: Improving GPT-5.6 in ChatGPT

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