ChatGPT, Claude and Grok suffer rare simultaneous outage

On September 3, several top AI services — ChatGPT (web, API, and Codex), Anthropic's Claude, xAI's Grok, and Gemini — suffered widespread failures almost simultaneously, in a rare industry-wide collective outage. As of the time of the posts, neither the cause nor a recovery timeline had been disclosed.

Confirmed

• ChatGPT's web app returned 404 or error pages, with the API and Codex down at the same time; Codex tasks kept failing or loading indefinitely (m3, m13, m15).
• Anthropic's status page reported elevated error rates for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 starting at 13:26 UTC on September 3, with an investigation underway (m6).
• Grok was down across the board, widely confirmed by X users (m16, m19); per a WatcherGuru flash report, Grok, ChatGPT, Gemini, and Claude were all partially down at the same time (m17).
• Multiple international outlets confirmed anomalies recorded on all three status pages (m7).
• The outage scope varied: some users in Germany confirmed the ChatGPT desktop client still worked, suggesting mobile might also be fine (m9).

Unconfirmed

• Some users suspected AWS was involved (m11), with no official confirmation.
• The community joked extensively that the outage was a precursor to OpenAI's new model "Astra" (m2, m3, m18); Astra is purely a community-guessed codename with no official basis.

Why it matters

• Three frontier labs going down at once is extremely rare, exposing availability risks from the concentration of top AI services; some users noted this was OpenAI's third outage in a week, calling its stability unacceptable (m12).
• Engineers relying on AI coding tools couldn't work that day (m15), and the community reacted with plenty of self-deprecating humor: one user said that without AI they couldn't even write a decent error message (m14), while another claimed the outage cost them their "social skills," leaving them unsure how to respond to a neighbor's greeting (m8); some posted screenshots of local llama.cpp running as usual for contrast (m4), highlighting how dependent heavy users are on cloud AI assistants.

2026-09-03 ~ 2026-09-04 · 72 related posts

• [source] Claude Mythos 5.1, Fable 5.1 and Opus 5 hit elevated errors, Anthropic investigating — ClaudeAI-mod-bot · 2026-09-03
• Grok and Claude reportedly down at the same time, user reports outage — rand_longevity · 2026-09-03
• Claude Status reports elevated errors across multiple models — Working_Quote_3029 · 2026-09-03
• As Claude Goes Down, X User Jokes OpenAI Should Seize the Moment With a Surprise 'Astra' Release — kimmonismus · 2026-09-03
• Grok Build and Grok 4.6 web UI go down at once, fueling speculation of a Colossus 1 outage — PawelHuryn · 2026-09-03
• Grok goes down with barely a ripple on the timeline — toptickcrypto · 2026-09-03
• Grok goes down: xAI chatbot suffers apparent full outage — ns123abc · 2026-09-03
• Claude and Grok down at the same time, jokes call for OpenAI to strike — eyishazyer · 2026-09-03
• Grok and Claude down at the same time — kevinnbass · 2026-09-03
• Codex, Claude and Grok All Went Down at the Same Time — fekdaoui · 2026-09-03
• [source] ChatGPT, Codex and API hit major outage, users speculate a new model launch — ethotopia · 2026-09-03
• ChatGPT appears down for many users as Reddit floods with error screenshots — sirthrowsalot1337 · 2026-09-03
• Another 404 outage report: ChatGPT down, Claude also erroring — djfoley29 · 2026-09-03
• ChatGPT and Codex appear to be down at the same time — brandon_galang · 2026-09-03
• ChatGPT and Claude throw simultaneous request errors, a first for this user — herbiebradley · 2026-09-03
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• Codex appears down with 404 errors, user speculates OpenAI 'astra' rollout — zats · 2026-09-03
• OpenAI Responses API hit by waves of 404s during the outage — fujikanaeda · 2026-09-03
• Codex and Claude down at the same time, sending users to open models — omarsar0 · 2026-09-03
• Grok goes down as ChatGPT outage hits on the same day — XFreeze · 2026-09-03
• ChatGPT suffers major outage alongside Grok on the same day — Polymarket · 2026-09-03
• Claude and Codex down at the same time, leaving users on k3 and dsv4 flash — sloppenheimer · 2026-09-03
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• "ChatGPT is down, I'm unemployed": a quip about AI dependence — xiaohu · 2026-09-03
• Claude and Codex down at the same time, devs forced to read code themselves — DavidKPiano · 2026-09-03
• ChatGPT outage leaves users joking they're '50 IQ points dumber' instantly — danshipper · 2026-09-03
• ChatGPT, Claude and Grok all down at the same time — joshgans · 2026-09-03
• Grok, Claude and Codex all glitch on the same day, sparking 'something big' speculation — VoidStateKate · 2026-09-03
• 'Claude and Codex are down' is the new 'GitHub is down' — supercoco9 · 2026-09-03
• Claude, ChatGPT and Cursor all down at once, fueling speculation of imminent Google model launch — cedric_chee · 2026-09-03
• ChatGPT suffers major outage, users joke that 'ASTRA is coming' — KIFF_82 · 2026-09-03
• Claude, ChatGPT and Grok all down simultaneously, users ask why — thisdudelikesAI · 2026-09-03
• Claude, ChatGPT, and Grok all down, possibly due to Cloudflare issue — vista8 · 2026-09-03
• Grok down for many users while Claude is overloaded in rare simultaneous outage — Daniel_Farinax · 2026-09-03
• Grok, Codex and Claude all down at once; Gemini stays up as 3.8 Flash lands — mikegiannulis · 2026-09-03
• ChatGPT and Codex down: tasks failing and hanging for users worldwide — Codeblix_Ltd · 2026-09-03
• Local model users get the last laugh as major cloud AI providers go down — zeeg · 2026-09-03
• Codex and Claude appear down at the same time, dev jokes it's time to touch grass — Rasmic · 2026-09-03
• OpenAI, Anthropic and xAI all go down at once; Zhipu pounces with promo — 赛博禅心 · 2026-09-03
• ChatGPT, Claude and Grok down simultaneously, Cloudflare suspected — curious_vii · 2026-09-03
• Grok, Claude and OpenAI All Down at Once, Leaving Gemini as the Only Option — ns123abc · 2026-09-03
• With ChatGPT down, a user asks Reddit how to respond to his neighbor's 'good morning' — sensitive-bull · 2026-09-03
• ChatGPT down today amid apparent multi-provider AI outage — Abhishekcur · 2026-09-03
• Claude went down, so I switched to Codex — then Codex went down too — Ubunta · 2026-09-03
• Claude and GPT Go Down at the Same Time, AI Community Melts Down — AndyMasley · 2026-09-03
• "Why are all the major providers down?" — multi-provider AI outage confuses users — basedjensen · 2026-09-03

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