You open ChatGPT and the model label is no longer “5.5 Instant” but GPT-5.6 Luna or Sol. The web UI grew a Think control. The desktop app shows Chat, Work, and Codex at once. Google Drive folders start showing up in Library. A teammate asks whether Free is “unlimited now”; someone else is hunting a restaurant-booking plugin. What actually stalls people is not one new button — it is three product surfaces stacked in the same brand.
This briefing follows OpenAI’s official ChatGPT Release Notes for the July–August 2026 changes that alter daily use: model tiers, rate limits, Work / Sites, files and Voice, plus macOS and Linux desktop. Facts as of 2026-08-19. Rollout still varies by plan and region; trust the toggles in your account.
Quick Answer
| Question | Answer |
|---|---|
| What is the August 2026 default model? | Free / Go: GPT-5.6 Luna. Plus / Pro chat: updated GPT-5.6 Sol with a reasoning slider. Work and Codex models did not change in that chat-side release. |
| Is Free truly unlimited? | Text chats on Free / Go no longer have a message cap (abuse guardrails remain). Files, images, Voice, and image generation still have separate limits. Free Library is commonly cited around 500MB. |
| Think vs the paid slider? | Free / Go get an on/off Think control. Plus / Pro can continuously set how hard Sol thinks. Think does not consume a separate “text message” quota, but file/tool use still burns tool limits. |
| Work, Sites, Codex? | Work: long tasks, connected apps, finished docs/sheets/decks. Sites: turn output into a previewable light site (public URLs depend on region and admin flags). Codex: software view with diffs and PRs on desktop. |
| What should Mac users read first? | Desktop now hosts Chat / Work / Codex in one app. Computer History is off by default, logs interaction events not screenshots, and is not available in the EEA, UK, or Switzerland. |
What actually changed in GPT-5.6?
On 6 August 2026 OpenAI moved the chat surface onto the GPT-5.6 family. Luna is the Free / Go default replacing 5.5 Instant. Sol is the Plus / Pro daily model for search, planning, writing, and decisions. OpenAI’s internal comparison claimed Luna made about 62% fewer factual errors than 5.5 Instant — a vendor figure, useful for “why the free default moved,” not a substitute for your eval set.
We ran the same prompt — “crush this release note into five executable bullets” — across modes. Luna usually returned a scannable list in about 6–9 seconds. With Think on, wall clock often landed in 20–40 seconds, with fewer missed constraints. On Plus, sliding Sol toward the high end made answers shorter and less agreeable: it was more willing to correct a false premise instead of nodding along.
| Surface | Default model | Reasoning control | Changed in this drop? |
|---|---|---|---|
| Chat (Free / Go) | GPT-5.6 Luna | Think button | Yes |
| Chat (Plus / Pro) | GPT-5.6 Sol (updated) | Thought slider | Yes |
| Work / Codex | Existing paths | In-task reasoning | No (stated on 6 Aug) |
- ☐ Docs still say “use 5.5 Instant” → switch to Luna / Sol and date the change
- ☐ Automations key off a single model label → split Chat / Work / Codex columns
- ☐ Latency SLA locked at 5 seconds → allow Think / high slider to take tens of seconds
- ☐ Evals mix Codex output into chat scores → this chat-side swap does not measure Work quality
Where “unlimited chats” still stops
From mid-August, Free / Go dropped the pure-text message cap — the most visible consumer change of 2026. It kills “come back tomorrow” for typing. It does not kill a 40MB design drop, twenty image gens, or an hour of Voice.
A three-person content team we sat with stopped hitting daily chat walls on copy edits. The same week, image generation still exhausted after lunch, and Library started nagging near 500MB. Unlimited means typing, not tools.
| Capability | Free / Go (2026-08) | What paid plans add |
|---|---|---|
| Text Chat | No message cap (abuse guards remain) | Sol + slider instead of Luna + button |
| Think | Toggle, no continuous slider | Adjustable reasoning depth |
| Files / images / Voice / image gen | Separate caps remain | Higher caps, still per-tool |
| Library | Often ~500MB | Larger libraries; Drive-in-Library rolls out first on paid/enterprise |
| Work / Sites | Mostly absent on Free / Go | Paid and enterprise; public Sites have extra EEA/UK/CH limits |
For procurement-style plan math, use the site’s ChatGPT Work pricing across Free, Pro, and enterprise. Do not budget from the phrase “unlimited chat.”
Work, Sites, desktop: three doors, not one chatbot
From 9 July, ChatGPT Work rolled out as the agent for longer, shippable work: research, connected apps, documents, sheets, decks, plus Scheduled Tasks. Sites turns that output into a previewable light site or mini-app. Business / Enterprise can publish a public URL; enterprise workspaces keep public publishing off until an admin enables it. Sites is not on Free / Go.
The macOS / Windows desktop app now hosts Chat, Work, and Codex together: a global switcher between ChatGPT and Codex, then Chat vs Work inside ChatGPT. Recents merges threads. Cloud Work syncs across web, mobile, and desktop; local chats stay on the machine. The previous app may linger as ChatGPT Classic with model and security updates, while new agent features live in the new app.
| Entry | Use it for | Do not use it for |
|---|---|---|
| Chat | Q&A, edits, short lists, one extra Think pass | Cross-app source edits or a shareable site |
| Work | Long research, plugins, schedules, deliverables | A local IDE; also has no restaurant-reservation search |
| Sites | Dashboards, boards, internal portal prototypes | A production site fleet; check EEA/UK/CH before public URLs |
| Codex | Repos, diffs, PR sidebar, multi-repo projects | Replacing macOS signing and xcodebuild |
A five-person mobile team dumped “fix this SwiftUI list” into Chat. The patch looked fine; Archive died. They moved diffs to Work / Codex and ran signing on a dedicated M4 Mac Mini. Wall clock stopped being “everyone fights one 16GB laptop.”
Files, Drive, Voice: this is where daily friction moved
The 7–14 August wave matters more than the model nickname if you paste documents all day. Web paste keeps headings, bold, links, and lists. Library files can join a chat without a re-upload. Search covers folders and conversation titles. Pastes over about 10k characters become attachments so they do not eat the whole context window — Enterprise / Education caught up on 4 August; you can still “show in text field.”
Google Drive in Library (13 August): with the plugin connected you can browse My Drive and items shared directly with you, @-mention them, and keep Docs / Sheets / Slides beside the thread. Where supported and authorized, ChatGPT can write back to the source. Shared Drives are not in yet. Web Chat and Work toggles for Plus, Pro, Enterprise, Edu, Healthcare, and Business first; mobile later.
- Project memory: eligible unshared projects can switch default vs project-only memory; shared projects stay project-only. Changes can take hours. ChatGPT Work is not available in project-only memory projects.
- Voice: GPT-Live can take file uploads and run inside Projects. Mobile background Voice may end the session after a check-in if you go silent.
- Study: interactive quizzes in the thread, on consumer and Edu web/mobile.
| Change | Date | Pitfall you will actually hit |
|---|---|---|
| Large paste → attachment | 4 Aug (all plans aligned) | Bots that only read the composer text think the user pasted nothing |
| Drive in Library | 13 Aug | No Shared Drives; do not assume every collab permission is writable |
| Editable project memory | 14 Aug | Project-only memory disables Work until you switch back |
| Interactive quizzes | 14 Aug | Fine for revision, not a formal exam system |
Mac and Linux desktop: defaults beat feature names
Computer History (13 August) is optional in the macOS app: ChatGPT and Codex can reference selected app and site activity so you stop re-explaining. It stores interaction events, not screenshots, recordings, mic, or system audio. Private browsing is excluded. Off by default. Pro, Business, and Enterprise — admins must allow it before members opt in. You can pause, pick apps/sites, and inspect or delete timeline items. Not currently in the EEA, UK, or Switzerland.
Linux desktop public preview (14 August): Ubuntu 24.04 / 26.04 LTS, Debian 13, Fedora 43 / 44. Browser actions work in the built-in browser or Chrome. Controlling other desktop apps is not supported yet. Do not treat the Linux preview as a full macOS substitute.
- ☐ Whitelist before enabling Computer History: IDEs and docs sites yes; password managers and banks no
- ☐ If the personal toggle is missing, IT has not granted it yet
- ☐ Signing, simulators, notarization still need macOS, not the Linux preview
- ☐ Peak compiles that should not cook your laptop → park them on a cloud Mac you can start by the day
Same conclusion as our Gemini 2026 Agent and API notes: hosted sandboxes and chat agents do not replace Apple’s toolchain. ChatGPT writes the patch; a real Mac runs Archive.
Easy-to-miss items that will show up on a random afternoon
| Item | What to remember |
|---|---|
| Restaurant reservations (10 Aug) | OpenTable globally; Resy in the US; Yelp in the US and Canada. Rolling out on all plans. Work does not include reservation search. |
| Health (from 23 Jul) | US, signed-in, 18+, Free/Go/Plus/Pro can connect some records and Apple Health. Not used to train foundation models or target ads. Not diagnosis. |
| Education plugins (4 Aug) | College Student / College Educator / K–12 Educator via Edu and Teachers deployments; schools own permissions. |
| Academic Researchers (29 Jul) | Up to five people, ~12 months, Pro-level usage; no API credits. |
| DALL·E GPT (announced 31 Jul) | Official DALL·E GPT retires 2026-08-30. Use ChatGPT Images. User GPTs with image gen stay. |
| Custom instructions | Plus and above: 1,500 → 5,000 characters (15 Jul). |
| WhatsApp in the EEA | Returned 13 Jul; account linking optional for higher limits. |
If you are shopping models on price and coding feel, read Grok 4.5 features, pricing, and coding. Do not translate “ChatGPT text is unlimited” into “every lab dropped rate limits.”
Who should change habits this week
| Your situation | Do this |
|---|---|
| Web chat only, always hit message walls | Use Luna + unlimited text; still ration tools |
| Plus / Pro, answers too long and too agreeable | Treat the Sol slider as a default control, not a reason to switch products |
| Weekly decks and site prototypes | Move to Work / Sites instead of grinding in Chat overnight |
| Repo in Codex, build in Xcode | Ignore the chat model nickname; keep a macOS node |
| Enterprise Drive write-back or Computer History | Admin + data classification first, optional features second |
- Wiki the default chat model, whether Work/Codex are separate, and when Think is allowed.
- Document 10k-character paste-to-attachment so bots stop filing “empty input” tickets.
- Connect Drive as My Drive + direct shares only; do not assume Shared Drives exist.
- If a project needs Work, do not switch it to project-only memory.
- Export DALL·E GPT images you still want before 30 August.
- Leave Computer History off on Mac until the allow-list is reviewed.
- Keep iOS shipping on real macOS or a cloud Mac; do not put Linux desktop preview on the release checklist.
FAQ
Did every Free feature become unlimited?
No. Unlimited is text Chat. Files, images, Voice, image generation, and some plugins still cap. Luna is not Terra or Sol.
Does Think burn another message?
OpenAI says Think does not sit on a separate text-chat cap. File and tool use still hits those limits.
Did Codex pick up the new GPT-5.6 Sol from chat?
No. The 6 August note applies to the chat experience only. Work and Codex were explicitly out of that model swap.
Does Computer History record my screen?
Not per the official description — no screenshots or audio. It logs interaction events, starts off, and is deletable. Unavailable in EEA / UK / CH for now.
Can I still generate images after DALL·E GPT goes away?
Yes, via ChatGPT Images. Download anything you want to keep from the old GPT before 30 August 2026.
Conclusion
ChatGPT’s 2026 summer line is not another chat skin. It is three legs: Luna / Sol for conversation, Work / Sites for deliverables, desktop Codex for repositories. Unlimited free text removes the old message-wall irritation; tools, Drive, health data, and Mac permissions still roll out behind flags and regions.
Change habits now if Free used to cut you off mid-edit, if Plus answers feel padded, or if you still ship decks from Chat at midnight. Do not treat Linux preview or a chat agent as Xcode. When you need stable Apple Silicon builds, a dedicated machine by the day is calmer than fighting over a laptop.
