1 Why give DeepSeek its own rule block
In 2026, domestic large-model traffic is still best modeled by concrete DNS names, not a vague “AI traffic” switch. DeepSeek’s public footprint centers on deepseek.com: the marketing site, account flows, and documentation often share that apex, while the interactive chat experience is commonly served from chat.deepseek.com. Developer integrations, batch jobs, and OpenAI-compatible clients instead talk to api.deepseek.com. Those hostnames sit under one suffix—deepseek.com—but your failure modes split by application: a browser tab may respect the OS proxy while a Go binary or container ignores it, so you still want routing you can explain line by line when something breaks.
Clash on the Mihomo core rewards that discipline: define a policy group such as PROXY_DEEPSEEK, attach DOMAIN-SUFFIX,deepseek.com (and optional RULE-SET rows), and insert those rules above broad GEOIP or MATCH catch-alls. Predictable logs mean every TLS handshake to DeepSeek surfaces shows the same outbound—critical when the symptom is “the web UI streams fine but the API client hangs,” which usually traces to mismatched egress, not the model being down.
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 chat and DeepSeek API requests
Path one—browser and product UI. Users typically open https://chat.deepseek.com for the conversational interface, or land on deepseek.com first and follow redirects. The SPA loads JavaScript bundles, WebSocket or long-lived HTTP connections for streaming, and occasionally third-party analytics or error reporting hosts that may fall outside the DeepSeek suffix. If you only route api.deepseek.com because you assumed “API == everything,” the chat shell can still stall on a static asset or websocket edge that never hit your proxy group. Symmetrically, routing “just the homepage” without the chat subdomain yields half-working sessions: OAuth may succeed while streaming never starts.
Path two—API and automation. Libraries that speak the OpenAI-compatible protocol point their HTTPS client at https://api.deepseek.com (commonly with a /v1 prefix for chat completions and embeddings). CI jobs, server-side workers, and local CLIs often bypass desktop “system proxy” settings unless you export HTTPS_PROXY, set HTTP_PROXY consistently, or enable TUN so the kernel forwards packets before user-space libraries apply their own rules. Always validate with curl -v from the exact environment that runs production code; guessing from a working Chrome tab is how teams burn afternoons.
Treat DeepSeek as a multi-surface system under one suffix: DOMAIN-SUFFIX,deepseek.com is usually enough for routing, but observability still separates web versus API in your runbooks. Third-party UIs that “wrap” DeepSeek may introduce their own domains—watch logs and add narrow DOMAIN lines only when you see a repeated miss.
3 Hostnames, CDN edges, and what to log
For most users, a single line—DOMAIN-SUFFIX,deepseek.com,PROXY_DEEPSEEK—covers deepseek.com, www.deepseek.com, chat.deepseek.com, and api.deepseek.com because they all share the registrable suffix. That is the usual sweet spot: minimal YAML, maximal clarity. When Mihomo logs show extra hosts—for example a separate static domain or an occasional third-party beacon—you can either add explicit DOMAIN rows above your suffix rule or maintain a small private rule provider file that your team reviews in Git.
Community lists labeled “DeepSeek” or “CN AI” can bootstrap faster than hand-writing lines, but inspect upstream intent: some bundles mix block semantics with routing, and aggressive lists may drop domains required for sign-in or telemetry you actually want during debugging. Prefer behavior: classical providers whose raw contents you can read, and keep overrides for hostnames your own traces have validated—not every stale gist from a forum thread.
After DeepSeek ships UI or API changes, repeat a controlled session once, export the hostname list from Clash logs, and diff it against your YAML. Append new lines before broad catch-alls so you preserve explainability when someone asks why traffic left DIRECT on Tuesday but not today.
4 Rule order: why placement beats clever keywords
Clash evaluates rules: from top to bottom; the first match wins. If your subscription ships a very broad GEOIP CN or early MATCH line, DeepSeek sessions may never reach PROXY_DEEPSEEK even though you “added DeepSeek somewhere.” Move explicit DOMAIN-SUFFIX and RULE-SET entries above catch-alls that would otherwise swallow the flow. When both a remote provider and inline lines exist, duplicate hostnames honor the earlier rule—use that deliberately so local hotfixes win during incidents.
Avoid lazy DOMAIN-KEYWORD,deepseek except as a short-lived probe: keyword rules are brittle and can collide with unrelated hostnames or internal test domains that happen to contain the substring. Suffix-based routing plus log-driven DOMAIN exceptions remains the maintainable default for teams that care about audit trails and least-privilege routing.
5 Illustrative YAML: groups, providers, and rules
The excerpt below is educational. Replace PROXY_DEEPSEEK 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_DEEPSEEK
type: select
proxies:
- AUTO-BEST
- DIRECT
rule-providers:
deepseek-ai:
type: http
behavior: classical
url: "https://example.com/rules/deepseek-ai.txt"
path: ./ruleset/deepseek-ai.yaml
interval: 86400
rules:
- RULE-SET,deepseek-ai,PROXY_DEEPSEEK
- DOMAIN-SUFFIX,deepseek.com,PROXY_DEEPSEEK
If you do not yet trust a remote URL, delete the RULE-SET line and rely on the DOMAIN-SUFFIX,deepseek.com row 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 overseas SaaS through PROXY,” but they are coarse, occasionally stale, and opaque when something breaks at 2 a.m. You might want a stable exit specifically for DeepSeek API traffic without dragging unrelated categories through the same congested node, or you might need different policies for domestic versus foreign AI vendors on the same laptop. Vendor-specific RULE-SET files or explicit DOMAIN-SUFFIX lines give you a Git-friendly diff; monolithic geosite imports do not.
Recommended pattern: keep your subscription’s baseline rules, then incrementally layer DeepSeek-focused providers or inline rows near the top of rules:. That preserves explainability when a teammate asks why a particular host stayed on DIRECT—your answer cites a line number, not an anonymous upstream blob you cannot inspect.
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 chat.deepseek.com tabs with local Python or Node jobs calling api.deepseek.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 HTTPS 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, OpenAI-compatible base URL, and automation
Most DeepSeek API users do not need a bespoke SDK: OpenAI’s official clients accept a custom base URL and API key, so the same TLS stack that calls api.openai.com can call api.deepseek.com when you set environment variables such as OPENAI_BASE_URL=https://api.deepseek.com/v1 (exact names depend on the library—check the docs you actually use). What matters for Clash is simpler: the TCP/TLS destination remains api.deepseek.com, so your DOMAIN-SUFFIX,deepseek.com rule still applies. If a library offers “use system proxy,” toggle it consistently with Clash’s system proxy; if it does not, prefer TUN or explicit proxy env vars. Never chain unknown public “API relay” services in front of your keys—transport privacy matters as much as TLS to the first hop.
Cross-vendor setups. Teams often run DeepSeek next to OpenAI, Anthropic, or Google models behind a single orchestration layer. Give each vendor its own policy group when billing, latency, or compliance requires different exits; avoid one mega-list that sends “all AI” through one node unless you truly intend that. If you standardize on OpenAI-compatible env vars across tools, document which base URL each job targets so operators do not confuse api.openai.com with api.deepseek.com when reading logs.
For IDE-centric workflows, also read Stable Cursor access with Clash: editor extensions add their own update channels; this article focuses on DeepSeek hostnames at the OS layer. For a fuller comparison of vendor hostname graphs, see our ChatGPT and OpenAI routing guide.
9 API keys, quotas, and policy boundaries
Reliable routing does not guarantee service entitlement. HTTP 401, 403, rate limits, or account-tier errors after connectivity is fixed belong to DeepSeek account settings, key rotation, or organizational policy—not your Clash YAML. Rotate keys that leaked into logs, store secrets in vaults for teams, and scope service accounts to the minimum models and endpoints they need.
This guide addresses client-side reachability only; it is not legal advice about regulated jurisdictions, export controls, or corporate acceptable-use policies. Use generative AI services in compliance with DeepSeek’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 chat completions over HTTP/2 or WebSocket on lossy routes may stall even when small JSON health checks 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.
Common error patterns after rules look “correct.” Endless TLS handshakes often mean DNS and FakeIP disagree; connection resets right after Client Hello may indicate SNI-based routing elsewhere on the path. For API clients, double-check you did not pin an old IP in /etc/hosts during a past experiment. For browsers, disable conflicting browser-only VPN extensions that fight Clash for the same traffic.
deepseek, 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 API scripts time out: The runtime likely bypasses system proxy—enable TUN or export
HTTPS_PROXY; verify withcurl -v https://api.deepseek.comfrom the same shell. - I added
api.deepseek.comonly; the web UI still fails: PreferDOMAIN-SUFFIX,deepseek.comsochat.deepseek.comand the apex site share the same policy; add explicitDOMAINrows only for non-suffix hosts you see in logs. - Do ChatGPT or Claude rules conflict? No, if order is clear—each vendor uses different suffixes; keep separate policy groups when exits or auditing must differ.
- Can I route only the API and send the web UI direct? Technically yes with narrow
DOMAINrules, but it is fragile; most teams route the wholedeepseek.comsuffix unless compliance forbids browsing while allowing API. - OpenAI SDK with DeepSeek base URL still fails: Confirm the library actually reads
HTTPS_PROXY, and that your base URL includes the correct API version path per DeepSeek docs—routing may be fine while the client points at the wrong path.
12 Wrap-up
Stable DeepSeek access in 2026 is less about chasing buzzwords and more about modeling a compact hostname graph: deepseek.com covers the marketing and account surfaces, chat.deepseek.com carries the interactive product, and api.deepseek.com anchors OpenAI-compatible automation—usually all reachable with one well-placed DOMAIN-SUFFIX line plus optional rule providers for team-maintained lists. Placing those rows before blunt catch-alls yields auditable logs and consistent egress across browsers, CLIs, and CI jobs. Compared with hiding everything inside a giant GEOSITE import, explicit suffix routing reduces surprise and makes on-call explanations short.
Among comparable tools, Clash’s combination of readable rules, the Mihomo feature set, and mature desktop clients fits developers who juggle browsers, SDKs, and containers on one workstation. 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 features—the outcome a solid proxy stack should deliver for DeepSeek users in 2026.
