ChatGPT Free Unlimited Chats and GPT-5.6 Luna Explained: What You Get and When

What changed (August 15, 2026): the Think button is no longer mobile-only. This page told you that if you use ChatGPT in a browser on a laptop, OpenAI had not said you get Think. That is now out of date. OpenAI's ChatGPT release notes entry of August 14, 2026 has a Web section whose first line reads: "Use Think on Free and Go. Select Think on the web when you want ChatGPT to reason through a harder question." The older help page still describes Think in the mobile app, and both are true -- mobile keeps it, the web gained it. Corrected in the summary, the FAQ, the Key Takeaways, both plan tables and the verdict.

What changed (August 11, 2026): it is delivered. OpenAI rewrote its GPT-5.6 in ChatGPT help page again on August 10 and it now states the thing it had said only once, in the present tense and twice over: "Free and Go users have unlimited everyday text chats, subject to abuse-prevention safeguards." The sentence it replaced -- "Free-tier users have limited GPT-5.5 Instant access within a 5-hour window" -- is gone. The Think button went from "will receive ... starting next week" to "can use Think ... in the ChatGPT mobile app." This page has moved from announced to delivered throughout.

The short version: free ChatGPT no longer meters typed conversation. In its ChatGPT release notes dated August 6, 2026, OpenAI said GPT-5.6 Luna becomes the default model for Free and Go users "this week," and that "starting next week, they'll also have unlimited text chats and access to a new Think button for harder questions." Both have now landed, and OpenAI's help page confirms them. The catch has not moved: "Limits will still apply for file uploads, images and other tools."

Key Takeaways

• Unlimited text chats are live, and OpenAI now says so on its own help page. "Free and Go users have unlimited everyday text chats, subject to abuse-prevention safeguards" -- stated twice in the article OpenAI rewrote on August 10.
• The old cap is gone from the page, not just outranked. OpenAI deleted the line describing "limited GPT-5.5 Instant access within a 5-hour window" rather than leaving it to contradict the new one.
• "Unlimited" means typed conversations only, and the excluded list got longer. OpenAI now names file uploads, image generation, voice, data analysis, and other tools as keeping separate limits. The August 6 changelog had said only "file uploads, images and other tools."
• The Think button is live on both the phone and the web. It launched mobile-only -- OpenAI: "Free and Go users can use Think for harder questions in the ChatGPT mobile app. Open the + menu and select the Think option" -- and its August 14, 2026 changelog added a Web section: "Use Think on Free and Go. Select Think on the web when you want ChatGPT to reason through a harder question."
• Free and Go run GPT-5.6 Luna as their default, confirmed on both OpenAI surfaces. The Think button runs on Luna too: "Think uses GPT-5.6 Luna, not GPT-5.6 Sol" -- a longer-thinking control on the free model, not a back door to the paid flagship.
• Unlimited does not reach Plus or Pro. OpenAI scopes both sentences to "Free and Go users." It has never said paid plans lose their caps.
• Paid plans got something different. Plus and Pro users received an updated GPT-5.6 Sol on August 6, with "more reliable facts, more focused answers, and a new slider to choose how much thought ChatGPT puts into a response."
• ChatGPT Work and Codex are untouched. OpenAI says so explicitly.

What Actually Changed on August 6?

OpenAI published a single changelog entry, and it does three separate things at once. The entry is titled "Updates to GPT-5.6 in ChatGPT" and it splits cleanly along the paid/free line: paid users get a better version of the model they already had, and free users get a better model plus the removal of the limit that defined the free plan.

Here is the entry in full, because the exact wording matters more than any summary of it:

Plus and Pro users can now use an updated GPT-5.6 Sol in ChatGPT with more reliable facts, more focused answers, and a new slider to choose how much thought ChatGPT puts into a response. GPT-5.6 Luna will become the default model for Free and Go users this week. Starting next week, they'll also have unlimited text chats and access to a new Think button for harder questions (subject to abuse guardrails). Limits will still apply for file uploads, images and other tools. This release applies to the chat experience in ChatGPT. Work and Codex are not changing as part of this release.

Two things are worth noticing straight away. First, this is a rollout in two stages, not one switch: the model change lands one week, the unlimited chats the next. Second, OpenAI has quietly answered a question it spent a month declining to answer -- which model a free ChatGPT account actually runs.

What "Unlimited" Does and Does Not Cover

It covers typing. It does not cover attaching. OpenAI draws the line in one sentence -- "Limits will still apply for file uploads, images and other tools" -- and that single clause is the difference between a genuinely unlimited plan and an unlimited chat box bolted to a limited everything-else.

The honest caveat is now a narrower one. OpenAI publishes no figure for any limit that remains, and its list of what stays capped quietly grew: the August 6 changelog said "file uploads, images and other tools," while the help page now spells out "file uploads, image generation, voice, data analysis, and other tools." Neither voice nor data analysis was named before. So the shape of the free plan is an uncapped chat box attached to a metered everything-else, and you will only discover where those meters sit by hitting them.

One older page still disagrees, and it is worth knowing which to trust. OpenAI's free-tier FAQ still describes the old five-hour usage window and still names GPT-5.5 as the free model. It has not been rewritten since June. The GPT-5.6 help page is the newer document and the one that names the current model, so follow it.

"Subject to abuse-prevention safeguards" is also doing real work, and OpenAI tightened the phrase rather than dropping it. Treat unlimited as unlimited-for-normal-use rather than a contractual promise.

What the Help Page Says That the Announcement Did Not

OpenAI's per-feature page is where the practical detail landed, and it answers several things the one-paragraph changelog entry never did.

Two of these change what you should expect. Think started mobile-only and is no longer: OpenAI's August 14, 2026 changelog put it on the web for Free and Go, so a laptop browser is now a place to look for it rather than a place it is missing. And a "think harder" button sounds like a taste of the expensive model; OpenAI has said plainly that it is not. It makes the free model spend longer, and the flagship stays behind the paywall.

There is one Go-specific number in the same article, and it is easy to misread as a contradiction: "Go users can send up to 10 messages every 5 hours after enabling Thinking." That is the separate Thinking control on the Go plan, not the text chat cap -- it sits alongside unlimited everyday chats rather than replacing them.

What Is GPT-5.6 Luna?

Luna is the smallest and fastest of OpenAI's three current models, and as of this week it is what free ChatGPT talks to. When OpenAI launched the GPT-5.6 family on July 9, 2026, it shipped three tiers: Sol as the flagship for the hardest work, Terra as the balanced everyday model, and Luna as the fast, cheap one. On the developer API those tiers are priced at $5, $2.50 and $1 per million input tokens respectively, which tells you roughly where Luna sits: it is the economy model.

That is not the insult it sounds like. For the questions most people actually ask a chatbot -- draft this email, explain this letter, what does this word mean, help me plan this -- the gap between the economy model and the flagship is small, and OpenAI says it is pairing the smaller model with no message cap. Trading a bit of headroom on hard problems for never hitting a wall would be a good deal for most free users.

What is genuinely new here is that OpenAI said the name at all. Since the July 9 launch, its position was that the flagship "is rolling out to eligible paid ChatGPT plans. Free, Go, and logged-out users are not included," and that availability for the other models "varies by product and plan; check the model picker." In other words: we will not tell you, go look. The August 6 note ends that. Our GPT-5.6 Sol explainer has been corrected accordingly.

Do You Get It, and on Which Plan?

Free and Go get the headline change; Plus and Pro get a better flagship instead. Nobody pays more.

Note what is still missing. OpenAI does not publish a number for any limit that remains on any plan, and it does not name a default model for the paid tiers. Where OpenAI is silent, this page stays silent -- there is no vendor source for the gaps.

Should You Care?

If you use free ChatGPT, this is the most useful thing OpenAI has done for you all year, and it has now actually done it. The free plan's defining frustration has been hitting a wall mid-task and being told to wait or pay. That wall is down for typed conversation, and you get a Think button -- on your phone and, since August 14, in your browser -- for the questions where the fast model would otherwise rush.

Stay on Free if you mostly type questions and read answers -- Luna is a current-generation model rather than a hand-me-down, and the cap on typing is gone.

Uncapped typing also quietly upgrades one feature in particular. OpenAI's August 14 entry added interactive quizzes on "all consumer ChatGPT plans and Edu plans," and a quiz is nothing but a long run of typed turns -- so on Free it is the one study tool that cannot run out mid-session.

Consider paying if your ChatGPT use is built on attachments: PDFs you need read, spreadsheets you need analysed, images you need generated. Those caps are exactly what did not change, and they are what a paid plan still buys. Our guide to whether ChatGPT Plus is worth it works through that trade in detail.

Cancel and test if you were subscribing purely because you kept running out of messages. That reason has expired, and the cost of finding out is one month of not paying $20.

This also reshapes the free-chatbot race. Free Grok already runs the model SpaceXAI's own app serves everyone, Grok 4.5, by default -- Grok 4.6 arrived on August 12, 2026 for developers only -- and Google's free Gemini tier bundles image generation, Deep Research and Gemini Live -- but both still meter conversation on rolling five-hour windows, per Google's limits page and Anthropic's getting-started article. Against those two, ChatGPT is the one that has now taken the meter off typed chat. Our best free AI chatbot comparison and our which chatbot should you pay for guide both carry the updated picture.

The bottom line: free ChatGPT runs a named current-generation model, GPT-5.6 Luna, and OpenAI's own help page now says Free and Go get unlimited everyday text chats plus a Think button, which reached the web on August 14 after launching on mobile. Uploads, images, voice and data analysis keep their limits, and OpenAI publishes no number for any of them. If you have been paying $20 a month mainly to stop hitting limits on typed conversations, that is no longer a reason to pay -- check your own usage before your next renewal.