1 Why “one API key” still means many hostnames
A unified multi-model API does not simplify the network layer—it centralizes billing and model selection while the browser experience around keys, usage charts, and account recovery remains a full web application. When you point a local script at an OpenAI-compatible /v1/chat/completions endpoint, you are only seeing the tip of the iceberg. The dashboard may load JavaScript bundles from a CDN, fetch analytics or feature flags from additional origins, and bounce authentication through identity providers that are not obvious from the first curl test. If your Clash profile treats “AI traffic” as a single fuzzy keyword, you will eventually watch a perfect API call fail because the session cookie was minted through a path that exited from a different country than the API request—classic split-brain OAuth, except the vendor is an aggregator instead of a single hyperscaler.
The fix is the same discipline that works for any serious SaaS: capture evidence, encode suffixes, and keep rules: ordered so explicit matches win over broad GEOIP shortcuts. Split routing for OpenRouter is less about “being clever” and more about refusing to let rare subdomains fall through to a default that made sense for shopping sites but not for token refresh. This guide assumes you already run a modern Mihomo-class core with readable connection logs; if not, start by stabilizing the client before you chase HTTP 403 ghosts.
Nothing here is legal advice about regulated jurisdictions or employer acceptable-use policies. Treat the patterns as engineering notes: log SNIs, version your YAML, and revisit rules when the vendor ships new marketing pages or payment partners.
2 Dashboard, API, and the hostnames you should verify yourself
Public documentation for OpenRouter illustrates requests against https://openrouter.ai paths such as the OpenAI-compatible chat completions route. In practice, that means your first-pass DOMAIN-SUFFIX anchor is openrouter.ai, covering both the marketing site and API calls that share the same registrable domain. Real sessions rarely stop there. Account recovery, payment methods, and enterprise features may introduce additional hosts for billing or analytics. Content delivery networks may serve static assets from domains that do not end in openrouter.ai, which is exactly when naive “route everything AI to PROXY” lists fail: the HTML loads, the bundle executes, then a telemetry call or a third-party script blocks on a hostname your rules never matched.
The professional workflow is to run one representative session—sign in, open the key page, start a small test completion—and read Mihomo’s live connections panel or export logs. Every recurring SNI becomes a candidate for either a precise DOMAIN row or a narrowly justified suffix. Resist the urge to route “all of Cloudflare” through your research exit; instead, add the specific edge hostname you observe twice on two different days. If a partner domain is shared with unrelated sites, prefer per-process routing or a dedicated browser profile rather than a global suffix that collateral-damages unrelated browsing.
For API-only workloads, remember that SDKs and CLIs may respect HTTPS_PROXY while long-running services ignore it. The hostname list for “works in curl” can diverge from “works in systemd” even when both target the same base URL. Aligning those paths is where API proxy discussions meet system design, not just YAML trivia.
3 Relationship to single-vendor LLM routing guides
Our ChatGPT and OpenAI article optimizes the graph around OpenAI-owned domains. A multi-model API gateway collapses many upstream vendors behind one front door; your rules should therefore center on the gateway’s hostnames first, then optionally add upstream-specific exceptions if you bypass the gateway for native keys. Similarly, GitHub Copilot coverage emphasizes Microsoft and GitHub edges. OpenRouter is complementary: you are routing the hub, not every model vendor’s public API individually—until you deliberately opt out for cost or compliance reasons.
If you also run Anthropic or DeepSeek keys directly alongside OpenRouter, keep those modules in separate ordered blocks so a catch-all for “AI” does not accidentally pin sensitive traffic to the wrong outbound group. Aggregators reward clean layering: gateway rules at the top, direct-provider rules next, domestic and intranet DIRECT pins unchanged, GEOIP last.
4 Recommended profile shape on Mihomo-class cores
Begin from a boring, correct baseline: mode: rule, domestic banking and LAN destinations on DIRECT, and clearly named proxy groups. Create a dedicated group such as AI_OR for OpenRouter-facing traffic so you can change nodes without editing dozens of lines. If interactive dashboard latency matters less than bulk batch jobs, you might split AI_OR_UI and AI_OR_API; most individuals can keep a single group until metrics prove otherwise.
Inside rules:, place OpenRouter-oriented DOMAIN-SUFFIX rows above wide GEOIP or subscription catch-alls. The most painful bugs arrive when a generic “foreign media” rule grabs part of the traffic while OAuth sticks to DIRECT because its hostname looked “domestic enough” on paper. After the OpenRouter module, continue with your normal stack and end with a predictable MATCH target. Document the order in a short comment block—future you will not remember why stripe.com landed next to openrouter.ai unless you note that billing broke during a key upgrade.
When you integrate community lists, read their intent. A list tuned for blocking trackers can break sign-in if it null-routes telemetry domains the dashboard still expects during a feature rollout. Prefer classical rule providers that only add routing policy, and keep destructive filters out of research profiles.
5 Example DOMAIN-SUFFIX rules (illustrative, extend with logs)
The snippet below is a starting point, not a promise that three lines solve every continent. Replace AI_OR with your real proxy group, and extend with additional DOMAIN rows after you inspect connection logs during real usage. Third-party billing or analytics hosts vary by account type and time; do not copy partner domains from forum posts without verifying SNIs locally.
# OpenRouter: primary site + API on the same registrable domain
- DOMAIN-SUFFIX,openrouter.ai,AI_OR
# Add log-backed rows for CDNs or partners you actually observe, e.g.:
# - DOMAIN,observed.cdn.edge-hostname.tld,AI_OR
If you discover that static assets load from a different registrable domain, add that suffix explicitly rather than widening keywords. Over-broad DOMAIN-KEYWORD matches are how you end up proxying unrelated services that happen to share a substring in their marketing copy.
6 Rule providers: automate lists without losing control
Hand-edited YAML is fine until your team shares profiles across laptops. Rule providers let you fetch curated fragments on an interval and merge them into the running config. The Mihomo ecosystem typically uses behavior: classical providers for portable rule text; pair them with a small private provider that only contains the OpenRouter-specific rows you have validated internally. That way upstream list churn cannot silently delete a suffix your OAuth flow still needs.
Set refresh intervals realistically. Hourly pulls sound agile until a surprise diff lands during a demo. Notifications on provider changes—email, chat webhook, or even a git diff in CI—beat blind automation. If you have never wired providers before, walk through our ACL4SSR rule provider tutorial for URL wiring and merge semantics before you point production machines at a stranger’s repository.
Version control still matters. Export the effective running config after merges and store redacted copies so you can answer “what changed last Tuesday?” without guessing from memory.
7 Cursor, Copilot, and local API clients on the same machine
Editors and assistants rarely speak HTTP in one uniform way. Electron-based tools may honor the operating system proxy, ignore it, or respect custom settings per window. A CLI might read HTTPS_PROXY while a language server spawned by the IDE does not. When you configure OpenRouter as the backend for coding agents, you want the entire chain—OAuth in the browser, extension marketplace calls if any, and the completion stream—to share coherent egress assumptions. Our Cursor + Clash guide walks through that stack; pair it with this article when the model endpoint is OpenRouter rather than a single vendor’s native hostname.
For GitHub Copilot users who also call OpenRouter from scripts, read Copilot sign-in routing so Microsoft edges and aggregator endpoints never fight each other in the same profile. The guiding principle is separation of modules: Copilot rules in one block, OpenRouter rules in another, shared domestic DIRECT pins unchanged.
Environment variables remain the lingua franca for quick tests. A typical pattern is HTTPS_PROXY=http://127.0.0.1:7890 alongside HTTP_PROXY, matching whatever mixed or HTTP port your client exposes. SOCKS-heavy stacks sometimes prefer ALL_PROXY=socks5://127.0.0.1:7891. Keep NO_PROXY strict for corporate registries and internal APIs so you do not tunnel sensitive traffic by accident. When curl succeeds but Node fails, you are debugging application behavior, not OpenRouter availability.
8 Symptoms when rules under-cover OpenRouter sessions
Misrouted SaaS traffic whispers before it screams. You might load the dashboard, see account metadata, and fail token refresh because the identity hostname never matched your proxy group. API calls can return intermittent HTTP 401 or 403 responses even when the key is valid, which often traces to mismatched exit geography between the session that created the cookie and the process issuing API requests. TLS warnings sometimes indicate FakeIP and OS resolver disagreement rather than a compromised certificate.
Another common pattern is “fast failures in the IDE, healthy results in the browser,” which usually means the editor subprocess ignored proxy settings while the browser did not—or vice versa when TUN is enabled for one test and disabled for another. Document the working combination after you fix it; OS upgrades love to reset interface metrics and resurrect the bug as a mystery.
When only part of a workflow breaks, resist swapping nodes first. Add logging, confirm SNIs, then adjust rules. Randomly rotating exits feels productive but often extends OAuth or rate-limit confusion instead of solving hostname coverage.
9 DNS, FakeIP, and why aggregators feel flaky when resolvers disagree
Modern desktops run multiple resolvers in parallel: OS stub, browser DoH, VPN or tunnel DNS, and Mihomo’s own upstreams. If Mihomo maps a name to FakeIP while another component resolves the same hostname to a different address family or CDN POP, you will see half-loaded pages, partial API retries, or maddening “works once per hour” behavior. Standardize on one story per machine: either Mihomo owns DNS with explicit fallbacks you understand, or the OS defers cleanly without fighting the tunnel.
IPv6 adds another split path. If the OS prefers IPv6 first but your policy assumes IPv4-only exits, some connections bypass Mihomo entirely. Test deliberately—temporarily disabling IPv6 for isolation is fine for diagnosis if you follow up with a documented long-term fix rather than leaving the toggle in limbo.
For deeper patterns—DoH, DoT, FakeIP, and leak checks—reuse Meta core DNS leak prevention whenever you touch enhanced-mode or add new upstreams while stabilizing OpenRouter.
10 When TUN beats per-app proxy for API-heavy workflows
System proxy mode helps well-behaved HTTP stacks, but runtimes spawned by IDEs, Docker, or systemd units routinely ignore environment variables. TUN pushes routing into the kernel so packets meet Mihomo before user-space libraries invent their own sockets. For a workstation that mixes browser dashboard work, local agents, and scripted API proxy calls, TUN often reduces one-off configuration drift. Our Clash Verge Rev TUN mode guide explains verification steps and loop avoidance; those skills transfer directly to aggregator endpoints.
After enabling TUN, repeat a minimal API call with system proxy disabled to confirm the CLI still traverses Mihomo. Snapshot the YAML that worked. Kernel updates and VPN software love to reorder interfaces without asking.
11 FAQ
- API works but the dashboard login loops: Capture SNIs during OAuth; add precise
DOMAINor suffix rows for identity and CDN hosts above catch-alls. - Dashboard works but curl fails: Compare proxy environment variables versus TUN capture; align DNS so FakeIP is not fighting the OS.
- Should I route every AI vendor separately? Only if you bypass OpenRouter for native keys; otherwise prioritize the aggregator’s host graph first.
- Do I need a commercial rule set? Optional. Community lists help, but your own log-backed rows are the ultimate source of truth.
- Where should teammates download the client? Use the site download hub for installers; keep GitHub for source and issues, not as the default onboarding path.
12 Wrap-up
OpenRouter captures the 2026 momentum behind multi-model API experimentation: less time juggling vendor accounts, more time evaluating models. The network story is still ordinary split routing—just aimed at an aggregator’s combined dashboard and inference plane instead of a single chat domain. Clash on Mihomo gives you the tools to express that story precisely: ordered DOMAIN-SUFFIX anchors, disciplined rule providers, DNS hygiene, and optional TUN so browsers, IDEs, and CLIs agree on the same exit. Compared with blunt VPNs, a rule-first profile keeps domestic traffic fast while research flows stay stable enough for real benchmarking instead of random disconnects.
Invest once in evidence-based YAML, then spend your attention on prompts and evaluation—not on guessing which subdomain missed the proxy. When you are ready to standardize clients across machines, start from our download hub so installs stay reproducible; upstream repositories remain the right place for licenses and collaboration, not the first hop for a tired teammate who only wants routing to behave before dinner.
