GPT Advent28 days. One door a day.
For 28 days, OpenAI ships something every day for Codex and ChatGPT Work: either one clear improvement for most users, or a full usage reset. Behind each door is what actually shipped. Open them, and tell us which ones you loved.
Announced by Tibo of the Codex team: @thsottiaux on X.
- Progress
- All 28 doors are open
- Ships
- 17
- Resets
- 11
- Votes
- 248
The calendar
- Door 1, Mon 5 Oct
-
↻ Full reset Day 2 roundup and a full usage resetDoor 2, Tue 6 Oct
- Door 3, Wed 7 Oct
- Door 4, Thu 8 Oct
-
✦ Shipped Composer predictions and dots on mobileDoor 5, Fri 9 Oct
-
↻ Full reset Full usage resetDoor 6, Sat 10 Oct
- Door 7, Sun 11 Oct
-
↻ Full reset Full usage resetDoor 8, Mon 12 Oct
- Door 9, Tue 13 Oct
-
↻ Full reset Full usage resetDoor 10, Wed 14 Oct
- Door 11, Thu 15 Oct
- Door 12, Fri 16 Oct
-
↻ Full reset Full usage resetDoor 13, Sat 17 Oct
-
✦ Shipped Edit earlier messages in the desktop appDoor 14, Sun 18 Oct
-
↻ Full reset Usage reset after COOKED episode 1Door 15, Mon 19 Oct
- Door 16, Tue 20 Oct
-
↻ Full reset Usage reset announced for day 17Door 17, Wed 21 Oct
- Door 18, Thu 22 Oct
- Door 19, Fri 23 Oct
-
↻ Full reset Full usage reset, confirmed completeDoor 20, Sat 24 Oct
-
↻ Full reset Usage reset announced for day 21Door 21, Sun 25 Oct
- Door 22, Mon 26 Oct
- Door 23, Tue 27 Oct
-
✦ Shipped Text your dot through iMessage or RCSDoor 24, Wed 28 Oct
- Door 25, Thu 29 Oct
- Door 26, Fri 30 Oct
-
✦ Shipped Banked usage reset: 1 of 2Door 27, Sat 31 Oct
-
✦ Shipped Banked usage reset: 2 of 2Door 28, Sun 1 Nov
Mon 5 Oct to Sun 1 Nov 2026. A new door opens at midnight San Francisco time. Doors you open stay open on this device.
Behind the doors
Most loved so far Day 3: GPT-6 in Chat, Codex Cloud and a banked reset 25 loved it
-
Banked usage reset: 2 of 2
Tibo closed the 28-day challenge with "Day 28/ Banked 2/2", confirming the second of the two banked resets announced for the final weekend.
-
Banked usage reset: 1 of 2
Tibo confirmed the first of two banked resets for the final weekend with "Banked 1/2" on October 31 Pacific time. His day 26 announcement had specified banked resets for the next two days.
-
Switch between two ChatGPT accounts on mobile
Account switching is rolling out in the ChatGPT iOS and Android apps. Stay signed in to two accounts and switch without signing out, while chats, memory, files, billing and settings remain separate. Tibo announced mobile availability for day 26 and said desktop support was coming soon.
-
Doubled Pro and Business Premium limits; Pro 200 reduction cancelled
Tibo announced doubled usage limits for Pro 100, 200 and 500 tiers and Business Premium, effective October 29. The planned reduction for Pro 200 is cancelled, preserving its existing Work and Codex allowance. Extended limits for dots continue for now, with dot usage remaining separate from default usage.
-
Text your dot through iMessage or RCS
Text your dot tasks, photos or voice notes through iMessage or RCS, and receive proactive updates by text. Tibo highlighted sharing or forwarding messages and using Siri to text a request to your dot. The feature is rolling out as a preview for Pro users in the US. Only you can text your dot, and it can only text you.
-
Full usage reset completed, plus iCloud Mail and Calendar plugins
Tibo called day 23 a full usage reset, scheduled it by midnight Pacific and later confirmed completion. He also highlighted iCloud Mail and Calendar plugins, available on all ChatGPT plans on web, desktop and iOS. Users can find email, catch up on their inbox, check upcoming events and update a calendar event.
-
GPT-6.1 Terra: better writing, computer use and twice Sol's usage
Tibo announced GPT-6.1 Terra, highlighting improved writing, personality, nuanced understanding of requests and strong computer use, with twice the usage of GPT-6.1 Sol across the API and subscriptions. OpenAI says it is rolling out to Plus, Pro, Enterprise and Edu users in ChatGPT Work and Codex, and is available in the API as gpt-6.1-terra.
-
Usage reset announced for day 21
Tibo announced a full usage reset for day 21, with seven days remaining in the challenge.
-
Full usage reset, confirmed complete
Tibo announced day 20 as a rest-and-reset day, with rollout due by midnight Pacific. He later confirmed that the reset had fully propagated.
-
Faster dot calls, cache-preserving reasoning changes and CLI updates
Dot calls now connect much faster, and changing reasoning settings during a Codex or Work conversation no longer invalidates the cache. The Codex CLI adds reusable prompt presets, inline model and permission settings, enterprise MCP sign-in and Windows corporate-proxy authentication, plus fixes for failures when resuming long sessions.
-
Usage reset announced alongside performance improvements
Tibo called day 18 a full usage reset while noting the Decisions API's general availability, OpenResponses joining the Linux Foundation, performance improvements, and Uber's adoption of Codex and Work. A follow-up scheduled the reset for October 23 before 10 a.m. Pacific, together with a small improvement whose details were not specified; it did not confirm completion.
-
Usage reset announced for day 17
Tibo announced a full usage reset for day 17. His follow-up said it would land the following morning, October 22, before 10 a.m. Pacific; that post gives rollout timing rather than confirming completion. He also reminded users to request Daybreak Blue access before an incident.
-
Persistent caching in Codex and Work, plus 12-hour API caching
Tibo says signed-in Codex and ChatGPT Work users now keep cached context indefinitely, with guaranteed cache hits when resuming old conversations or returning after a few hours. The API also offers 12-hour prompt caching, keeping shared instructions, tools and context available at the lower cached-input rate between requests.
-
Usage reset after COOKED episode 1
Tibo followed the earlier COOKED episode 1 post with a day-15 usage reset. The broadcast covers voice in the Codex CLI, tracking agents, forking conversations into worktrees and cloud tasks that keep running after you close your laptop. It also features demos using ChatGPT Space, GPT-Live-1 and Ultrafast.
-
Edit earlier messages in the desktop app
You can now edit previous messages within a thread in the desktop app.
-
Full usage reset
Day 13 brings another usage reset, with completion confirmed by Tibo later that day.
-
More effective usage, plus Pro, Slides and dot updates
Codex and ChatGPT Work make plan usage go further by reusing context across subagents, keeping it cached longer and routing requests for more cache hits. Tibo also highlighted improvements to GPT-6 Pro, dots on the iOS Home Screen, and Slides in ChatGPT Space. Slides were available to Pro, Business and Enterprise users while the team gathered feedback.
-
Fewer model-capacity errors and automatic recovery
Additional compute and service changes significantly reduce model-at-capacity errors. If a capacity error still occurs, the task should eventually continue on its own instead of remaining blocked.
-
Full usage reset
Day 10 brings a usage reset. Tibo confirmed completion later the same evening in Pacific time.
-
Desktop state storage uses about 60% less disk space
Optimizations to how the ChatGPT and Codex desktop app stores its state should reduce that stored data by about 60%, helping users whose app data has been filling their disks.
-
Full usage reset
Day 8 brings another usage reset. Tibo followed up later that evening to confirm it was done.
-
GPT-6.1 Sol gets a 500k default context window
GPT-6.1 Sol's default context window in Codex and ChatGPT Work increases from 272k to 500k, reducing compactions and keeping more task context available. You can still override it up to 1M. Tibo also confirmed that long-context fees are waived when Sol draws usage from a subscription.
-
Full usage reset
Day 6 brings a usage reset. Tibo later confirmed that it had fully propagated.
-
Composer predictions and dots on mobile
The desktop app can suggest your next message from the conversation. Composer predictions are in beta for Pro users and do not consume plan usage. You can also create and message your dot directly in the ChatGPT app on iOS and Android.
-
Instant steering and GPT-6.1 Sol Ultrafast
Steering now takes effect instantly, so the model reacts faster to changes in direction and spends less time on work you no longer want. GPT-6.1 Sol Ultrafast is also rolling out in the API, Codex and ChatGPT Work, with near-Astra intelligence at up to 8x the speed of Sol Standard.
-
GPT-6 in Chat, Codex Cloud and a banked reset
Day 3 brought GPT-6 in Chat and a banked reset for paid accounts, marking 40 million active users across Codex and ChatGPT Work. Tibo also announced that Codex Cloud had been re-shipped.
-
Day 2 roundup and a full usage reset
2.1/ Approve for me (auto-review) is now included and does not consume usage. Depending on use, this can save 2–10% of your plan's usage. It also improves the experience for you. 2.2/ A simplified API for builders. 2.3/ Meeting notes are now integrated. 2.4/ The Decisions API is live for builders. It will be used in the app to improve the experience. Tibo also confirmed that a full usage reset had been processed after the four improvements.
-
GPT-6 Astra and GPT-6.1 Sol run about 50% faster by default
The default speed of GPT-6 Astra and GPT-6.1 Sol through a ChatGPT subscription went up by about 50%, in OpenAI's own products and in partners that use Sign in with ChatGPT, such as OpenCode, Pi, Amp and Devin. Nothing to change on your side: it reaches everyone within two hours.