GPT 5 Codex High - garbled messages, duplicated words and punctuation symbols, like a bad small llm from ~4 years ago

What version of Codex is running?

0.53.0

What subscription do you have?

ChatGPT Pro

Which model were you using?

GPT 5 Codex High

What platform is your computer?

arm64

What issue are you seeing?

Seeing these kinds of messages over the last week while having Codex generate code or do a /review:

• Investigatingating JSON JSON parsing parsing and and environment environment issues issues
  I'm analyzing analyzing how how  apiapiRequestRequest handles handles JSON JSON parsing parsing,,        │
  especially especially with with 204 204 no no-content-content responses responses and and potential      │
  potential server server-side-side execution execution where where ` `windowwindow is is undefined        │
  undefined.. There There’s’s a a likely likely Reference ReferenceErrorError from from directly directly  │
  accessing accessing  windowwindow in in Node Node//SSRSSR without without proper proper guards guards,,  │
  so so I I’m’m checking checking if if ` `apiapiRequestRequest or or  queryqueryClientClient run run      │
  server server-side-side where where ` `windowwindow isn isn’t’t available available.. This This could    │
  could be be the the root root cause cause of of the the bug bug..

What steps can reproduce the bug?

Uploaded thread: 019a3d4b-5553-7131-96fe-4286af9dece6

Otherwise no clear way of replicating this.

What is the expected behavior?

Not generating speech like the LLM has head trauma.

Additional information

_No response_