The short answer
As of August 6, 2026, you don't need Plus for everyday text chat anymore. OpenAI lifted the free-tier text limit and switched GPT-5.6 Luna to the default model in the same move — but file uploads, voice, and hard reasoning still sit behind paid tiers. Here's the exact model split, the rollout, and my honest verdict on whether staying at $20 is worth it.
What OpenAI changed this week
ChatGPT has crossed 1 billion weekly users, and the update reshapes the whole tier structure:
- Free and Go users get GPT-5.6 Luna as their default, replacing GPT-5.5.
- From next week, free and Go users also get unlimited text chats and a new Think button that spends more reasoning on harder questions (subject to abuse guardrails).
- Plus and Pro users get an upgraded GPT-5.6 Sol in Chat, tuned to answer the real question first, use tighter formatting, and give fuller responses when the task is complex.
- Plus and Pro also get a thinking slider (web, mobile, desktop) that sets how much effort the model puts in per conversation.
The detail most headlines miss: the GPT-5.6 Sol that powers Work and Codex is a separate model and is NOT changing in this release. So "GPT-5.6 Sol" now means different things depending on which surface you're using.
GPT-5.6 Luna vs Sol vs the Work Sol
| Surface | Model | What you get |
|---|---|---|
| Free / Go (Chat) | GPT-5.6 Luna | New default; unlimited text + Think button next week |
| Plus / Pro (Chat) | GPT-5.6 Sol | Focused answers, fewer errors, thinking slider |
| Plus / Pro (Work&Codex) | GPT-5.6 Sol (separate) | Agentic tool, unchanged by this release |
Rollout is staggered, not instant
- Today (Aug 6): Plus and Pro get the updated GPT-5.6 Sol in Chat and the thinking slider.
- This week: GPT-5.6 Luna becomes the default for free and Go users.
- Next week: Free and Go users get unlimited text chats and the Think button.
So the real "chat free forever" moment lands next week, not today. If you log in expecting unlimited chat right now, you'll be a few days early — the Luna default comes first.
Where the free cap still bites
OpenAI was explicit: the remaining limits apply to file uploads, images, voice, and audio. Unlimited text is real, but the instant a professional workflow becomes "paste a contract and ask" or "generate images," you still hit a wall. The upgraded Sol with 68% fewer factual errors lives on paid tiers.
Should you cancel Plus?
My practitioner's framing:
- Keep Plus if you depend on long document uploads, image or audio generation, or serious coding/agent work in the Codex and Work surfaces.
- Drop to free if your usage is text-first: quick research, writing, planning, and conversational answers. That full profile is now covered unlimited.
- Keep Plus for professionalism if you want the more reliable Sol (68% fewer errors) and the thinking slider for work you sell or ship.
What this means for your weekly bill
Do the math before you act. ChatGPT Plus at $20/month is a habit for a lot of freelancers and professionals, and this change directly attacks that habit. If your week is 20 quick chats, a research session, and a drafted email, the free tier now handles all of it. If your week includes a 40-page PDF, a deck of images, or a coding span in an agent, the free cap shows up fast — and that's exactly where OpenAI still wants you paying.
A price-to-capability table that keeps it clean
Here's a decision table my own workflow suggests:
| Your typical use | Best tier | What you get |
|---|---|---|
| Text chats, quick research, writing drafts | Free | Unlimited text chats from next week, GPT-5.6 Luna, Think button |
| Docs, image/audio gen, long context | Plus ($20) | GPT-5.6 Sol, thinking slider, media limits lifted |
| Coding agent, heavy automation | Plus or higher | Separate Codex-optimized Sol, agent reliability |
The honest answer: free is now the right tier for text-first users, and Plus is a buy for media and context, not for language. Keep that split in mind and you will not overweight either.
Key Statistics
- ChatGPT crossed 1 billion weekly users as it moved free users to unlimited text. — OpenAI
- In OpenAI's internal evaluation of financial, medical, and legal prompts, answers containing a factual error were 68% less common with GPT-5.6 Sol and 62% less with Luna than with GPT-5.5 Instant. — OpenAI
- The 1 billion weekly user and the unlimited-chat move land the same week, signaling free access is now the default growth lever. — TechCrunch
FAQ
Q: Is ChatGPT free really unlimited now?
A: Text chats unlimited, yes — starting next week, after GPT-5.6 Luna becomes the default. File, image, voice, and audio limits still apply.
Q: Do I still have to pay $20?
A: Only if you rely on file uploads, media generation, agentic coding, or maximum factual reliability. For plain text chat, free now covers it.
Q: What is the Think button?
A: It asks ChatGPT to use more reasoning on harder questions, subject to OpenAI's abuse guardrails.
Q: Is the Sol in Codex the same as the chat one?
A: No. Codex and Work use a separate GPT-5.6 Sol that stays unchanged. Only the Chat version was updated today.
Q: When does unlimited free arrive?
A: The Luna default is this week; the unlimited text and Think button roll out next week on a gradual schedule.
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