Persistent 0% prompt cache hits on GPT-5.5 with Auckland NZ Cloudflare 520s complicating every workaround

USA: No significant change in GPT-5.5 on Responses (top, pink: cached input, bottom, purple: uncached input) The challenge for OpenAI will then be fixing their localization and Cloudflare routing. gpt-5.3-codex only looking better because it spews tiny tool calls instead of following the offered tool mechanics to combine and parallel its outputs. But also unchanged.