ChatGPT vs Claude: Which Is More Reliable? Uptime & Outage Comparison [Real-Time]

The comparison table above shows each service's current status along with its 24-hour and 7-day uptime (our own estimate). These figures are the share of snapshots that were "normal" among those we have collected since we began monitoring, and they are not the official SLA values published by either company.

In general, both major providers maintain high uptime. Rather than one always being better than the other, it is more practical to think of them as "differing in when and how outages occur." Check the table above for the latest figures.

ChatGPT has many components, such as Conversations, GPTs, voice mode, image generation, and search, so it is prone to "partial outages" where only a specific feature goes down. You may run into cases where chat works fine but only image generation is unstable.

Claude tends to announce outages at the model level (Opus / Sonnet / Haiku), and a notable trait is that "overloaded (529)" errors are more likely to appear when demand spikes. When only a specific model is unstable, switching to a different model can sometimes work around it.

In fact, even in our first month of monitoring (June 2026), both companies recorded several short-lived spikes in errors on individual features or individual models. Most were transient and recovered within about an hour.

Claude is a strong temporary substitute when ChatGPT is having trouble, and the reverse is equally true. For many use cases, such as writing, summarizing, and coding assistance, the two are interchangeable.

Features unique to ChatGPT, like image generation and voice, cannot be replaced by Claude, so in those cases other services such as Gemini also become candidates. The fastest move is to pick whichever side shows "normal" in the table above.