OpenAI Responses API adds blocked domains

This is a small feature with outsized practical value: it turns web search from a blunt instrument into something teams can actually use in production.

• –Lets teams exclude noisy, low-trust, or policy-sensitive sites without disabling web search entirely
• –Reduces exposure to prompt-injection and SEO spam when agents browse the open web
• –Fits mixed workflows better than allowlists alone, especially when you want broad coverage with a few hard exclusions
• –Reinforces Responses API as the control center for agentic search, not just a query wrapper
• –Useful for compliance-heavy environments where “search the web” needs guardrails, not just access