OpenAI updated GPT-5.6 Sol in ChatGPT for Plus and Pro users and is expanding GPT-5.6 Luna for Free and Go users. The headline change is better everyday ChatGPT behavior for paid users, plus unlimited text chats and a new Think button for free users, with some limits still applying.
Quick answer
The August 6, 2026 ChatGPT update has two parts. Plus and Pro users get an updated GPT-5.6 Sol in ChatGPT, with a new slider for choosing how much thought ChatGPT puts into an answer. Free and Go users are moving to GPT-5.6 Luna as the default model and are scheduled to get unlimited text chats plus a Think button for harder questions.
| Reader question | Current answer |
|---|---|
| Who gets GPT-5.6 Sol in ChatGPT? | Plus and Pro users |
| What changed for Sol? | More focused answers, better factual reliability, and a thinking slider |
| Who gets GPT-5.6 Luna? | Free and Go users as the default model this week |
| Are free text chats unlimited? | OpenAI says unlimited text chats start next week, subject to abuse guardrails |
| Do file uploads and tools become unlimited? | No. OpenAI says limits still apply to file uploads, images, and other tools |
| Does this change Codex or ChatGPT Work Sol? | No. OpenAI says this update applies to the Chat experience in ChatGPT |
If you use ChatGPT mainly for quick answers, writing, planning, or research, this is a product-access update. If you build with the API or Codex, do not assume your model behavior changed from this announcement.
What changed for Plus and Pro users
OpenAI says GPT-5.6 Sol in ChatGPT is now tuned for everyday conversations. The company describes three main changes:
- More direct and focused answers.
- Fewer factual mistakes in answers that depend on dates, numbers, sources, rules, or assumptions.
- More consistent behavior between quick replies and deeper reasoning.
Plus and Pro users also get a slider in ChatGPT on web, mobile, and desktop. The slider controls how much thought ChatGPT puts into an answer. OpenAI describes it as useful for moving between quick everyday replies and harder work such as planning, research, writing, coding, or decisions.
For a broader checklist before relying on any AI product, see how to compare AI tools.
What changed for Free and Go users
OpenAI says GPT-5.6 Luna will become the default model for Free and Go users this week. Starting next week, those users are also scheduled to get unlimited text chats and a Think button for harder questions.
The word “text” matters. OpenAI says limits still apply to file uploads, images, and other tools. That means unlimited text chats does not mean unlimited access to every ChatGPT feature.
If your account has not changed yet, the rollout may simply not have reached you. Check ChatGPT’s model picker, account plan, app version, and the official release notes.
What is confirmed
OpenAI has confirmed these points:
- The announcement was published on August 6, 2026.
- Plus and Pro users can access the updated GPT-5.6 Sol in ChatGPT starting that day.
- The updated Sol is designed for more focused answers and more reliable facts.
- Plus and Pro users get a slider for choosing response effort in ChatGPT.
- GPT-5.6 Luna becomes the default model for Free and Go users this week.
- Free and Go users are scheduled to get unlimited text chats next week.
- Free and Go users are scheduled to get a Think button next week.
- Abuse guardrails still apply.
- File uploads, images, and other tools still have limits.
- The ChatGPT Work and Codex version of GPT-5.6 Sol is not changing as part of this release.
What remains unknown
Several practical details still need account-level checking:
- Exact rollout timing for each country and account.
- Whether all mobile users see the slider at the same time as web users.
- The exact guardrails that may interrupt unlimited text chats.
- Current message limits for file uploads, images, and other tools.
- Whether school, work, Enterprise, or managed accounts have different controls.
- Whether the model name shown in your app matches the rollout notes immediately.
For changing plan and billing details, use OpenAI’s own ChatGPT account pages before upgrading.
How to check whether you have it
Use the smallest check first:
- Open ChatGPT on web, desktop, or mobile.
- Check the model picker or visible model label.
- If you are on Plus or Pro, look for the new thinking slider.
- If you are on Free or Go, check whether Luna is the default model.
- Try a normal text chat before testing files, images, or tools.
- Check OpenAI’s release notes if the feature is not visible.
Do not reinstall the app immediately. Feature rollouts can lag by account, region, platform, or app version. Our guide to app not working issues covers the same basic troubleshooting pattern.
What the update does not mean
This update does not make every ChatGPT feature unlimited. OpenAI specifically says limits remain for file uploads, images, and other tools.
It also does not mean every OpenAI product is using the same updated Sol behavior. OpenAI says the everyday-chat version of GPT-5.6 Sol is only available in ChatGPT’s Chat experience, and that the GPT-5.6 Sol version powering Work and Codex is not changing with this release.
If you are comparing plans, separate model access from tool access, file limits, workspace controls, privacy settings, and billing. Our AI tool pricing guide explains why those details can matter more than the model name alone.
Official sources
OpenAI’s August 6 product announcement confirms the GPT-5.6 Sol update for Plus and Pro users, GPT-5.6 Luna rollout for Free and Go users, unlimited text chats, the Think button, the slider, and the remaining tool limits.
OpenAI’s ChatGPT release notes list the same August 6, 2026 update for ChatGPT users.
OpenAI’s official news RSS feed published the ChatGPT GPT-5.6 Sol and Luna update on August 6, 2026.
FAQ
What is GPT-5.6 Sol in ChatGPT?
GPT-5.6 Sol is the higher-capability model OpenAI is updating for Plus and Pro users in ChatGPT. The August 6 update focuses on everyday ChatGPT answers, not Codex or ChatGPT Work.
Who gets GPT-5.6 Luna?
OpenAI says GPT-5.6 Luna becomes the default model for Free and Go users this week.
Are ChatGPT Free chats unlimited now?
OpenAI says Free and Go users will get unlimited text chats starting next week, subject to abuse guardrails. Limits still apply to file uploads, images, and other tools.
What is the new Think button?
The Think button gives Free and Go users a way to ask GPT-5.6 Luna to spend more time on harder questions. OpenAI says it arrives next week for those users.
Does this update change Codex?
No. OpenAI says the GPT-5.6 Sol version powering Work and Codex is not changing as part of this ChatGPT release.
Why do I not see GPT-5.6 Sol or Luna yet?
Rollouts can vary by account, plan, region, app version, and platform. Check the model picker and OpenAI’s release notes before assuming your app is broken.