1 Why give ChatGPT and OpenAI their own rule block
Generative AI workloads in 2026 still split cleanly by vendor DNS graph, not by a single “AI” checkbox. Google routes Gemini through sprawling googleapis.com surfaces; Anthropic clusters around anthropic.com and claude.ai; OpenAI splits consumer chat under chatgpt.com while developer and corporate surfaces remain strongly tied to openai.com and API gateways like api.openai.com. If you merge all of that into one blunt overseas bucket, you either over-proxy unrelated sites or under-cover a suffix that breaks only the API or only the web shell.
Clash on the Mihomo core rewards explicit objects: you name a policy group—say PROXY_OPENAI—bind DOMAIN-SUFFIX rows or a curated RULE-SET to it, and place those lines above generic MATCH or continent rules so they cannot be skipped. The outcome is predictable logs: every connection to OpenAI-related hosts shows the same outbound, which matters when you debug “browser works, Python SDK times out” scenarios that are almost always egress mismatch, not model downtime.
If you are new to graphical clients, start from our download page for a maintained installer, then merge the YAML fragments below into your profile. Open-source repositories remain useful for license and issue tracking, but day-to-day installs should follow the site’s download flow for consistent versioning.
2 Two paths: web UI and OpenAI API requests
Path one—browser ChatGPT. Users typically land on chatgpt.com (historically chat.openai.com may still appear in redirects or bookmarks). The page loads HTML, JavaScript bundles, and static assets that may resolve to additional hosts—sometimes *.openai.com, sometimes dedicated asset domains such as oaistatic.com or oaiusercontent.com when your logs show them. If you route only api.openai.com but forget the chat front door, you get confusing partial failures: sign-in works, the composer never finishes streaming, or images fail silently because a CDN hostname stayed on DIRECT.
Path two—API and automation. Application code, batch jobs, and most official SDKs terminate HTTPS on api.openai.com for the public product (exact paths and versions per current docs). Platform settings, usage dashboards, and key rotation often touch platform.openai.com and other *.openai.com hosts. CLI tools and containers frequently ignore macOS or Windows “system proxy” toggles unless you export HTTPS_PROXY or enable TUN, which is why network engineers insist on verifying curl from the same shell that runs production scripts.
Treat OpenAI as a multi-host system: any missing suffix shows up as intermittent timeouts, not a clean error string. Third-party wrappers that embed their own HTTP stack may disagree with the browser unless the OS routes packets uniformly—another reason TUN is popular for mixed desktop workflows.
3 Hostnames, CDNs, and what to log
A practical baseline covers at least DOMAIN-SUFFIX,openai.com and DOMAIN-SUFFIX,chatgpt.com toward your OpenAI policy group. The openai.com suffix already includes api.openai.com and platform.openai.com for typical REST calls and console flows. The chatgpt.com suffix captures the consumer product hostname graph. When logs reveal additional asset domains, add them explicitly or fold them into a private rule-provider file you control, refreshing on a schedule that matches how often OpenAI ships UI changes.
Community-maintained lists labeled “OpenAI” or “ChatGPT” can accelerate bootstrapping, but read the upstream semantics: some lists mix block rules with routing rules, and ad-blocking style drops can break OAuth or embedded widgets. Prefer behavior: classical providers with transparent contents, and keep a short private override list for hosts your team has actually seen in production—not every forum paste from last year.
After major ChatGPT or API releases, re-run a controlled browsing session and capture hostnames once. Append new suffixes ahead of broad catch-all rules so regressions are rare and explainable during incident review.
4 Rule order: why placement beats clever keywords
Clash evaluates rules: from top to bottom; the first match wins. If your subscription inserts a very broad GEOIP or MATCH line before your OpenAI-specific rows, traffic may never reach the intended policy group. Move explicit DOMAIN-SUFFIX and RULE-SET entries above those catch-alls. When both a remote provider and inline lines exist, remember duplicate hostnames follow the earlier rule—use that to let local overrides win during triage.
Avoid lazy DOMAIN-KEYWORD,openai except as a temporary probe: it can collide with unrelated sites or internal tools whose names happen to contain the substring. Suffix-based routing plus log-driven one-off DOMAIN lines ages better for enterprise laptops where false positives are expensive.
5 Illustrative YAML: groups, providers, and rules
The excerpt below is educational. Replace PROXY_OPENAI with your real selector or url-test group, merge with your subscription’s naming conventions, and validate with your client’s config linter before applying to production routers.
# Example only — merge with your full profile
proxy-groups:
- name: PROXY_OPENAI
type: select
proxies:
- AUTO-BEST
- DIRECT
rule-providers:
openai-chatgpt:
type: http
behavior: classical
url: "https://example.com/rules/openai-chatgpt.txt"
path: ./ruleset/openai-chatgpt.yaml
interval: 86400
rules:
- RULE-SET,openai-chatgpt,PROXY_OPENAI
- DOMAIN-SUFFIX,openai.com,PROXY_OPENAI
- DOMAIN-SUFFIX,chatgpt.com,PROXY_OPENAI
If you do not yet trust a remote URL, delete the RULE-SET line and rely on the two DOMAIN-SUFFIX rows until your private list matures. Pair this block with coherent DNS: see our DNS leak prevention guide for DoH, FakeIP, and resolver alignment that prevents “rule matched but TLS still fails” ghost issues.
DOMAIN-KEYWORD for short debugging windows; production profiles should favor suffixes and curated providers.
6 Why blunt GEOSITE alone is a weak default
Large geosite bundles are convenient for “send US SaaS through PROXY,” but they are coarse and occasionally stale. You might want a low-latency exit specifically for AI APIs without dragging unrelated properties through the same congested hop, or you might need to split OpenAI from another vendor that shares a broad category tag. Vendor-specific RULE-SET files or explicit suffix lines give you a diff you can review in Git; monolithic geosite imports do not.
Recommended pattern: keep your subscription’s baseline rules, then incrementally layer OpenAI-focused providers or inline rows near the top of rules:. That preserves explainability when a teammate asks why a particular host left DIRECT—your answer cites a line number, not an opaque upstream blob.
7 TUN, system proxy, and environment variables
System proxy mode helps browsers and well-behaved CLI tools, but runtimes that open raw sockets or ignore HTTP_PROXY may still bypass Clash. For workstations that mix ChatGPT tabs with local Python or Node jobs calling api.openai.com, TUN mode often yields the most consistent story: packets enter Mihomo before user-space libraries apply their own policy. Our Clash Verge Rev TUN guide covers loop avoidance and verification steps that generalize to any SaaS API.
When you prefer proxies without TUN, export HTTPS_PROXY (and HTTP_PROXY where needed) to match your Clash mixed port, align SOCKS if your stack requires it, and audit NO_PROXY so internal registries and localhost are not accidentally hairpinned. Document the working combination for CI runners so scheduled jobs inherit the same egress as developer laptops—nothing is more frustrating than “works locally, fails in GitHub Actions” because only one side exported proxy variables.
8 SDKs, automation, and Azure OpenAI
Official SDKs ultimately issue HTTPS requests to documented endpoints; as long as those hostnames hit the same policy group as your browser tests, transport behavior should align. If a library offers “use system proxy,” toggle it consistently with Clash’s system proxy setting. If it does not, prefer TUN or explicit env vars. Never chain unknown public “API proxy” services in front of your keys—transport privacy matters as much as TLS to the first hop.
Azure OpenAI uses Azure-specific endpoints and DNS names, not the public openai.com graph. In hybrid clouds where both Azure-hosted and public OpenAI are used, model separate rule blocks or policy groups so a DOMAIN-SUFFIX,openai.com line cannot silently misroute Azure traffic—or vice versa. Label YAML comments clearly for future operators.
For IDE-centric workflows, also read Stable Cursor access with Clash: editor extensions add their own update channels; this article focuses on OpenAI hostnames at the OS layer.
9 API keys, account region, and policy boundaries
Reliable routing does not guarantee model entitlement. HTTP 401, 403, quota, or billing errors after connectivity is fixed belong to account settings, organization policy, or regional product availability—not your Clash YAML. Rotate keys that leaked into logs, use secret managers in teams, and enforce least privilege for service accounts.
This guide addresses client-side reachability only; it is not legal advice about regulated jurisdictions or corporate acceptable-use policies. Use generative AI services in compliance with OpenAI’s terms and your local regulations.
10 DNS, logs, and practical troubleshooting
Split-brain DNS—Mihomo resolving to FakeIP while the OS stub still queries the ISP—remains a top cause of mysterious TLS failures. Align resolvers deliberately, flush stale caches after profile edits, and when testing, fix one variable at a time: node choice, DNS mode, then application timeouts. Streaming responses over HTTP/2 on lossy routes may stall even when small JSON calls succeed; try another exit or tune client read timeouts after routing is proven clean.
IPv6 surprises persist: if the OS prefers IPv6 first but your policy assumes IPv4-only proxy paths, some sessions may bypass Clash intermittently. Either route IPv6 consistently or temporarily disable IPv6 while isolating the issue, then return with a proper fix rather than leaving the toggle off forever.
openai and chatgpt, capture hostnames once per incident, and snapshot working YAML when the issue clears—future you inherits evidence, not guesswork.
11 FAQ
- Chat works in the browser but scripts time out: The CLI likely bypasses system proxy—enable TUN or export proxy env vars; verify with curl from the same environment.
- I only added openai.com; the UI still breaks: Add
chatgpt.comand any asset domains visible in logs, or adopt a maintained provider that already lists them. - Do Gemini or Claude rules conflict? No, if groups and order are clear—each vendor uses different suffixes; keep separate blocks when exits must differ.
- Can I route only the API? Yes, but narrow rules demand extra verification that web and platform hosts are not required by your workflow; check logs after every change.
12 Wrap-up
Stable ChatGPT and OpenAI API access in 2026 is less about a magic keyword and more about modeling OpenAI’s hostname graph: chatgpt.com for the product surface, openai.com for platform and API hosts such as api.openai.com, plus log-discovered CDN suffixes when needed. Clash split routing with DOMAIN-SUFFIX and optional rule providers, placed before broad catch-all rules, gives you auditable policy and shared egress between browsers and automation. Compared with dumping everything into a single oversized GEOSITE bucket, explicit rows reduce surprise leakage and make team onboarding boring—in the best sense.
Among comparable tools, Clash’s combination of readable rules, the Mihomo feature set, and mature desktop clients often fits developers who juggle browsers, SDKs, and containers on one machine. When you need a client, use our download hub for maintained packages; cite GitHub for source and issues, not as the primary installer path for everyday users.
Once routing stops stealing attention, you can focus on prompts, evaluations, and shipping product—the outcome a solid proxy stack should deliver for OpenAI users in 2026.
