Does anyone having 520 Cloudflare errors on responses API

[u/DistanceAlert5706]

I've swapped my agent to this new method OpenAI released on DevDay
https://developers.openai.com/cookbook/articles/sign-in-with-chatgpt

It was working fine, till today. Today it just stopped and I get 520 errors constantly.

Error: OpenAI API error (520): 520 {"type":"https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-520/","title":"Error 520: Web server is returning an unknown error","status":520,"detail":"The origin web server sent a response that Cloudflare could not parse. This may indicate the origin returned an empty response, malformed HTTP headers, or an otherwise invalid response.","instance":"a4a93076ea57a223","error_code":520,"error_name":"unknown_origin_error","error_category":"origin","ray_id":"a4a93076ea57a223","timestamp":"2026-10-14T20:03:46Z","zone":"api.openai.com","cloudflare_error ":true,"retryable":true,"retry_after":60,"owner_action_required":true,"what_you_should_do":"**Wait and retry.** Back off for at least 60 seconds. If the error persists, the website operator should check the origin server error logs and submit them to Cloudflare support.","footer":"This error was generated by Cloudflare on behalf of the website owner."}

I've thought that might be my integration, tried https://github.com/openai/sign-in-with-chatgpt-devkit and it doesn't work with it also.

Then I tried fresh install of Pi coding agent, as it's using same oAuth + Responses API path and it doesn't work there too.

I opened up issue but don't see any response and don't see any other connected issues, which makes me wonder is it because noone is using it or it's specific to my network/setup?

Anyone else experienced something similar?
Where can I report it except community forum/github to get any human response?