On November 18, 2025, many people woke up, opened ChatGPT like they always do… and got nothing but error pages.
If you saw Cloudflare or 500 errors instead of answers, you weren’t alone. This wasn’t just “ChatGPT being buggy” — it was part of a major internet-wide outage.
Here’s a clear, non-technical breakdown of why ChatGPT was down and when it was restored, plus what actually happened behind the scenes.
1. What actually happened?
On November 18, 2025, a major outage at Cloudflare — a huge internet infrastructure company — caused parts of the web to effectively “disappear” for many users.
Because OpenAI (ChatGPT) and many other services sit on top of Cloudflare’s network, when Cloudflare started failing, people around the world saw:
-
“500 Internal Server Error” pages
-
Cloudflare-branded error screens
-
Timeouts or pages that wouldn’t load at all
This outage impacted a long list of big platforms — not just ChatGPT. Reports show that X (Twitter), Spotify, Canva, Discord, Uber, League of Legends, Perplexity AI, and many others were also hit at the same time. Reuters+1
So in simpler terms:
ChatGPT was down because the internet “roads” it uses (Cloudflare’s network) were temporarily broken, not because ChatGPT itself suddenly stopped working.
2. Who is Cloudflare and why does it affect ChatGPT?
Think of Cloudflare as a traffic controller for the internet:
-
It routes web traffic efficiently around the world
-
It protects sites from attacks and bad traffic
-
It caches content to make websites faster
Millions of websites and apps use Cloudflare, including OpenAI / ChatGPT. Wikipedia
So when Cloudflare has a bad day, a lot of the internet feels it — even though nothing inside those services’ own data centers may be “broken” in the traditional sense.
3. Why was ChatGPT down? The technical cause (plain-English version)
According to reports and Cloudflare’s own status updates, the outage on November 18, 2025 was triggered by: Reuters+2WMTW+2
-
A “spike in unusual traffic” that hit Cloudflare’s network
-
This led to widespread 500 errors (server failure messages)
-
Cloudflare’s dashboard and API were also failing, making it harder for customers to manage or bypass the issue
Because ChatGPT relies on Cloudflare for routing and protection, users saw:
-
Cloudflare error pages
-
Pages that simply wouldn’t load
-
Intermittent access where it would work for a bit, then break again
There’s no evidence that this was due to hacking, a data breach, or something specific being “wrong with ChatGPT itself.” The failure happened at the network layer (Cloudflare), not at the AI / app layer (OpenAI’s models).
4. Timeline: When did ChatGPT go down, and when was it restored?
The exact times can vary a bit by region and monitoring source, but here’s what multiple reports line up on. Wikipedia+4Reuters+4WMTW+4
Early incident window
-
Around 6:40 a.m. ET (11:40 UTC) – Cloudflare detected internal service degradation and began investigating.
-
Soon after, users worldwide started seeing 500 errors and Cloudflare error pages when trying to use ChatGPT and other sites.
Monitoring sites like Downdetector saw thousands of incident reports roll in as people realized ChatGPT, X, and many other platforms wouldn’t load. Reuters+1
Peak outage
-
Over the next hour or so, the outage escalated into a major global event.
-
Tech outlets and live blogs confirmed that OpenAI products (including ChatGPT) were affected due to issues at Cloudflare, not due to a direct OpenAI system failure. TechRadar+1
During this time, many users:
-
Could not log in
-
Could not start new chats
-
Got errors after sending messages
-
Or couldn’t even load chat.openai.com at all
Recovery phase
Cloudflare and status trackers reported that: Wikipedia+3WMTW+3Tom's Guide+3
-
Cloudflare identified the root issue (unusual traffic spike and resulting network errors) and deployed a fix.
-
The company noted it was “seeing services recover,” but warned that some users would still see elevated error rates as traffic stabilized.
-
Reports of outages on Downdetector for services like X and OpenAI spiked and then gradually dropped over the next couple of hours.
When was ChatGPT restored?
Because this was a network outage, restoration wasn’t a single “switch flip” moment — it was a gradual return:
-
For many users, partial access started coming back within 1–2 hours of the initial incident as Cloudflare rerouted and stabilized traffic. Tom's Guide+1
-
As Cloudflare’s fix rolled out globally, error rates continued to fall, and ChatGPT returned to normal availability for most regions later that morning (U.S. time), with lingering pockets of intermittent issues while caches and routes fully normalized. Tom's Guide+2Digital Trends+2
OpenAI’s own status page associated the outage with Cloudflare issues and showed recovery as Cloudflare’s network came back online. OpenAI Status+2TechRadar+2
5. Was ChatGPT hacked? Did it lose my data?
Short answer: No evidence of that.
Based on publicly available information:
-
The outage was not described as a security breach, but as a network/infrastructure disruption at Cloudflare’s level. WMTW+2Reuters+2
-
The pattern — multiple big, unrelated services all dropping at once due to shared infrastructure — is consistent with a routing / traffic / DNS issue, not with a targeted hack on ChatGPT.
In events like this:
-
Your chats and data are still stored in OpenAI’s systems (subject to their data policies).
-
The failure is in getting your device to talk to those systems, not in the safety of the data inside them.
If you were in the middle of a chat and lost your session, you might see:
-
A “network error” mid-conversation
-
A need to refresh the page or log in again
-
But that doesn’t necessarily mean your prior stored conversations vanished — only that the connection broke.
6. How do these big outages happen?
Outages like this — where half the internet seems to sneeze at once — usually involve:
-
Shared dependencies
-
Many services rely on the same underlying provider (like Cloudflare or AWS).
-
When that provider breaks, everything built on top of it is affected.
-
-
Traffic spikes / routing bugs
-
A misconfiguration, a bad software rollout, or a sudden traffic surge can hit capacity limits or cause systems to fail health checks.
-
Cloudflare indicated a spike in unusual traffic contributed to the problems on November 18, 2025. Wikipedia+1
-
-
Cascading failures
-
When enough nodes in a routing layer become unhealthy, traffic gets rerouted, sometimes overloading the remaining nodes and making the outage worse — until engineers intervene, rollback changes, or add capacity.
-
This isn’t unique to Cloudflare; similar patterns have been seen in major AWS and Azure outages that have also temporarily knocked ChatGPT and other services offline in the past. 9to5Mac+2The Verge+2
7. What can users do when ChatGPT is down?
When ChatGPT (or any cloud service) is down, here are some practical steps:
-
Check if it’s really “just you”
-
Visit OpenAI’s status page. OpenAI Status
-
Check Downdetector for OpenAI/ChatGPT. Downdetector
-
-
Don’t keep hammering the refresh button
-
Repeated failed requests can sometimes add unnecessary load during a fragile recovery.
-
-
Copy important text before sending
-
If the page is acting unstable, write in a local editor (Notepad, Word, Notes, etc.) and paste into ChatGPT so you don’t lose long prompts.
-
-
Try again in a bit
-
With large infrastructure providers, most outages are measured in minutes or a few hours, not days. Once Cloudflare or similar providers roll out a fix, services like ChatGPT usually come back quickly.
-
8. Lessons from the November 18, 2025 outage
This incident highlights a few big truths about the modern internet:
-
Interdependence is huge
A single infrastructure provider like Cloudflare or AWS can indirectly “turn off” dozens of major brands for a while — including ChatGPT. -
The problem isn’t always where you feel it
If you can’t open ChatGPT, it’s natural to think “ChatGPT is broken.” But often, the failure lies one or two layers beneath, in networking and routing. -
Redundancy is hard but crucial
Large organizations, including OpenAI, continuously work on adding more redundancy and failover paths so that one provider’s failure doesn’t take everything down. Incidents like this often lead to more investment in multi-region, multi-provider resilience.
9. Quick FAQ
Q: Why was ChatGPT down today?
Because a major Cloudflare outage caused widespread 500 errors and routing issues, affecting many sites that depend on its network, including ChatGPT. Wikipedia+4Reuters+4WMTW+4
Q: When was ChatGPT restored?
For most users, partial access began returning within 1–2 hours of the first issues, with more stable, normal behavior later that morning (U.S. time) as Cloudflare’s fix fully rolled out and error rates dropped. Wikipedia+3Reuters+3Tom's Guide+3
Q: Was my data compromised?
Public reports describe this as a network outage, not a data breach or hack against ChatGPT specifically. There’s no indication that user data was exposed; the systems just couldn’t be reliably reached. WMTW+2Reuters+2
Q: Has ChatGPT gone down before?
Yes. Previous outages have happened due to load spikes, internal routing issues, or cloud provider incidents (e.g., AWS or Azure problems). OpenAI maintains a public incident history on its status page.