ChatGPT, Claude and Grok Suffer Rare Simultaneous Outage

On September 3, ChatGPT (web, API and Codex), Anthropic's Claude and xAI's Grok suffered near-simultaneous large-scale outages in a rare industry-wide incident; tools like Cursor and even Fortnite were also affected, while reports conflicted on whether Google's Gemini was hit. According to Wired, neither OpenAI nor Anthropic explained the cause, and the event sparked broad criticism of concentrated dependence on top AI providers, shared infrastructure risk and poor outage transparency. Follow-up community analysis suggests three coincidental, independent incidents rather than a common root cause.

Confirmed

• ChatGPT's web app returned 404 or error pages, with API and Codex simultaneously down, leaving many engineers relying on AI coding tools unable to work; Claude Design was also unusable, with Reddit users reporting failures from multiple regions, some initially suspecting account bans.
• Anthropic's status page reported elevated error rates starting 13:26 UTC on September 3 for Claude Mythos 5.1, Claude Fable 5.1 and Claude Opus 5, with investigation ongoing and a pinned r/ClaudeAI thread.
• Grok was fully unavailable, widely confirmed by X users; per WatcherGuru, Grok, ChatGPT, Gemini and Claude all saw partial outages at the same time; Cursor also reported failures and even Fortnite was affected. Multiple outlets confirmed all three providers' status pages logged anomalies.
• Scope varied: a user in Saxony, Germany confirmed the ChatGPT desktop client still worked, speculating mobile likely did too.
• Whether Gemini was affected is disputed: some users and WatcherGuru reported Gemini issues, but TechTimes reported Gemini was largely unaffected, attributing this to architectural independence versus shared cloud infrastructure among other AI providers.
• Community user ThirumalaivasanGJ's September 4 retrospective argued these were three independent incidents, not a conspiracy: OpenAI failed first around 7:43 AM Pacific due to a routing error that took down ChatGPT and Codex across web, mobile and desktop for roughly half an hour.
• Wired noted both OpenAI and Anthropic went dark the same day without explaining why, and that user and enterprise dependence on these vendors has reached the point where "an outage is news," while vendor disclosure remains inadequate.

Unconfirmed

• Some users suspected an AWS-related common infrastructure failure, as did Cursor's outage post; neither was officially confirmed, and the September 4 retrospective leaned toward independent incidents, with no official verdict.
• Community jokes framed the outage as a precursor to OpenAI's rumored model "Astra," spawning conspiracy theories that an Astra release crippled competitors; user iiiaaa2022 explicitly debunked this, noting one company's model launch cannot break rivals' services and that Astra itself is pure community speculation.

Why it matters

• Having OpenAI, Anthropic, xAI and Google services unavailable for hours simultaneously is extremely rare, exposing availability risks from concentration and shared infrastructure; even if coincidental, the blast radius alone is alarming.
• Engineers relying on AI coding tools were idled for the day, prompting self-deprecating reactions: users complained their error messages to colleagues lost all grammar without AI polish, showed local llama.cpp running fine, and one user who kept a 24/7 ChatGPT call for social situations didn't know how to answer a neighbor's greeting, even asking them to "wait a few minutes."
• The event also drew brand-rivalry mockery: users joked OpenAI should surprise-launch Astra while Anthropic was down, or that only Gemini 3.8 Flash remained usable; Polymarket cited its Grok outage bulletin and had run a "will ChatGPT go down this month" market; Jeremybtc quipped that with no automated forced-selling mechanism, stocks actually rallied while all AI models were down.

2026-09-03 ~ 2026-09-05 · 101 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
• 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
• Claude, Codex, and Grok go down at the same time — gandamu_ml · 2026-09-03
• 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
• ChatGPT, Gemini and Grok all down at the same time amid widespread outage — stanbuckley · 2026-09-03
• Users report seemingly every AI model service down at the same time — damnGruz · 2026-09-03
• "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
• OpenAI, Cursor, Cloudflare all go down at once, sparking upstream outage speculation — op7418 · 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

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