diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b0a12b8..17a06f85 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # v0.5.35 (2026-07-16)
 
 ## Features
+- **Orbit Provider**: add Anthropic-compatible API-key routing for Claude Opus 4.6–4.8 models
 - **xAI**: Grok Imagine video generation (`/v1/videos`) + CLI
 - **CLI tools**: Grok Build setup — writes `[model.9router]` to `~/.grok/config.toml`
 - **GitHub Copilot**: route Claude models through Copilot's native `/v1/messages`
diff --git a/open-sse/providers/registry/index.js b/open-sse/providers/registry/index.js
index e4cf5439..17c67b84 100644
--- a/open-sse/providers/registry/index.js
+++ b/open-sse/providers/registry/index.js
@@ -99,6 +99,7 @@ import p96 from "./xai.js";
 import p97 from "./xiaomi-mimo.js";
 import p98 from "./xiaomi-tokenplan.js";
 import p99 from "./youcom.js";
+import p100 from "./orbit-provider.js";
 
 export default [
   p0,
@@ -200,5 +201,6 @@ export default [
   p96,
   p97,
   p98,
-  p99
+  p99,
+  p100
 ];
diff --git a/open-sse/providers/registry/orbit-provider.js b/open-sse/providers/registry/orbit-provider.js
new file mode 100644
index 00000000..0c7ffbfe
--- /dev/null
+++ b/open-sse/providers/registry/orbit-provider.js
@@ -0,0 +1,31 @@
+export default {
+  id: "orbit-provider",
+  priority: 100,
+  alias: "orbit",
+  display: {
+    name: "Orbit Provider",
+    icon: "public_dns",
+    color: "#8B5CF6",
+    textIcon: "OB",
+  },
+  category: "apikey",
+  authType: "apikey",
+  transport: {
+    baseUrl: "https://api.orbit-provider.com/anthropic/v1/messages",
+    format: "claude",
+    headers: {
+      "anthropic-version": "2023-06-01",
+    },
+  },
+  models: [
+    { id: "claude-opus-4-8", name: "Claude Opus 4.8" },
+    { id: "claude-opus-4-7", name: "Claude Opus 4.7" },
+    { id: "claude-opus-4-6", name: "Claude Opus 4.6" },
+    { id: "claude-opus-4-6-thinking", name: "Claude Opus 4.6 (Thinking)" },
+  ],
+  serviceKinds: ["llm"],
+  thinkingConfig: {
+    options: ["auto", "on", "off"],
+    defaultMode: "auto",
+  },
+};
diff --git a/public/providers/orbit-provider.png b/public/providers/orbit-provider.png
new file mode 100644
index 00000000..dc58142b
Binary files /dev/null and b/public/providers/orbit-provider.png differ
diff --git a/src/app/api/providers/[id]/test/testUtils.js b/src/app/api/providers/[id]/test/testUtils.js
index a05e6f4e..f97d03c7 100644
--- a/src/app/api/providers/[id]/test/testUtils.js
+++ b/src/app/api/providers/[id]/test/testUtils.js
@@ -19,6 +19,7 @@ import {
   KIMCHI_CONFIG,
 } from "@/lib/oauth/constants/oauth";
 import { buildClineHeaders } from "@/shared/utils/clineAuth";
+import { validateConfiguredClaudeApiKey } from "@/lib/providers/apiKeyValidation";
 
 // OAuth provider test endpoints
 const OAUTH_TEST_CONFIG = {
@@ -526,6 +527,13 @@ async function testApiKeyConnection(connection, effectiveProxy = null) {
   }
 
   try {
+    const configuredClaudeResult = await validateConfiguredClaudeApiKey(
+      connection.provider,
+      connection.apiKey,
+      (url, options) => fetchWithConnectionProxy(url, options, effectiveProxy),
+    );
+    if (configuredClaudeResult !== null) return configuredClaudeResult;
+
     switch (connection.provider) {
       case "cloudflare-ai": {
         const psd = connection.providerSpecificData || {};
diff --git a/src/app/api/providers/validate/route.js b/src/app/api/providers/validate/route.js
index 0d761276..2b41844f 100644
--- a/src/app/api/providers/validate/route.js
+++ b/src/app/api/providers/validate/route.js
@@ -6,6 +6,7 @@ import { resolveOllamaLocalHost, resolveXiaomiTokenplanBaseUrl, PROVIDERS } from
 import { openaiToCommandCodeRequest } from "open-sse/translator/request/openai-to-commandcode.js";
 import { normalizeProviderId } from "@/lib/providerNormalization";
 import { requireProviderAdministrator } from "@/lib/providers/connectionAccess";
+import { validateConfiguredClaudeApiKey } from "@/lib/providers/apiKeyValidation";
 
 // Probe a webSearch/webFetch provider using its searchConfig/fetchConfig.
 // Returns true if API key is accepted (status !== 401 && !== 403).
@@ -253,6 +254,13 @@ export async function POST(request) {
         });
       }
 
+      // Registry-backed Anthropic-compatible providers share one config-driven
+      // validation flow instead of requiring a hardcoded switch case.
+      const claudeResult = await validateConfiguredClaudeApiKey(provider, apiKey);
+      if (claudeResult !== null) {
+        return NextResponse.json(claudeResult);
+      }
+
       switch (provider) {
         case "openai":
           const openaiRes = await fetch("https://api.openai.com/v1/models", {
diff --git a/src/lib/providers/apiKeyValidation.js b/src/lib/providers/apiKeyValidation.js
new file mode 100644
index 00000000..79a579b2
--- /dev/null
+++ b/src/lib/providers/apiKeyValidation.js
@@ -0,0 +1,56 @@
+import { getModelsByProviderId } from "open-sse/config/providerModels.js";
+import { PROVIDERS } from "open-sse/config/providers.js";
+
+function setAuthHeader(headers, auth, apiKey) {
+  if (!auth?.header) return false;
+  headers[auth.header] = auth.scheme === "bearer" ? `Bearer ${apiKey}` : apiKey;
+  return true;
+}
+
+function buildClaudeValidationHeaders(config, apiKey) {
+  const headers = {
+    "Content-Type": "application/json",
+    ...(config.headers || {}),
+  };
+  const auth = config.auth;
+
+  if (auth?.combined) {
+    setAuthHeader(headers, auth, apiKey);
+  } else if (auth?.apiKey) {
+    setAuthHeader(headers, auth.apiKey, apiKey);
+  } else if (!setAuthHeader(headers, auth, apiKey)) {
+    headers["x-api-key"] = apiKey;
+  }
+
+  return headers;
+}
+
+/**
+ * Validate an API key for a registry-backed Claude-format provider.
+ * A non-auth error still confirms that the upstream accepted the credential.
+ *
+ * @returns {Promise<{valid: boolean, error: string|null}|null>} null when the
+ * provider is not backed by a Claude transport.
+ */
+export async function validateConfiguredClaudeApiKey(provider, apiKey, fetchImpl = fetch) {
+  const config = PROVIDERS[provider];
+  if (!config?.baseUrl || config.format !== "claude") return null;
+  const model = getModelsByProviderId(provider)?.[0]?.id;
+
+  const response = await fetchImpl(config.baseUrl, {
+    method: "POST",
+    headers: buildClaudeValidationHeaders(config, apiKey),
+    body: JSON.stringify({
+      model,
+      max_tokens: 1,
+      messages: [{ role: "user", content: "test" }],
+    }),
+    signal: AbortSignal.timeout(10000),
+  });
+  const valid = response.status !== 401 && response.status !== 403;
+
+  return {
+    valid,
+    error: valid ? null : "Invalid API key",
+  };
+}
diff --git a/tests/unit/orbit-provider.test.js b/tests/unit/orbit-provider.test.js
new file mode 100644
index 00000000..5b9f5d6f
--- /dev/null
+++ b/tests/unit/orbit-provider.test.js
@@ -0,0 +1,87 @@
+import { describe, expect, it, vi } from "vitest";
+
+import { getExecutor } from "../../open-sse/executors/index.js";
+import { PROVIDERS, PROVIDER_MODELS } from "../../open-sse/providers/index.js";
+import REGISTRY from "../../open-sse/providers/registry/index.js";
+import { validateConfiguredClaudeApiKey } from "../../src/lib/providers/apiKeyValidation.js";
+
+describe("Orbit Provider", () => {
+  const orbit = REGISTRY.find((entry) => entry.id === "orbit-provider");
+
+  it("registers an Anthropic-compatible API-key provider", () => {
+    expect(orbit).toBeDefined();
+    expect(orbit).toMatchObject({
+      alias: "orbit",
+      category: "apikey",
+      authType: "apikey",
+      serviceKinds: ["llm"],
+      transport: {
+        baseUrl: "https://api.orbit-provider.com/anthropic/v1/messages",
+        format: "claude",
+      },
+    });
+  });
+
+  it("builds the Claude transport with default x-api-key authentication", () => {
+    expect(PROVIDERS["orbit-provider"]).toMatchObject({
+      baseUrl: "https://api.orbit-provider.com/anthropic/v1/messages",
+      format: "claude",
+      headers: {
+        "anthropic-version": "2023-06-01",
+      },
+    });
+
+    const executor = getExecutor("orbit-provider");
+    expect(executor.buildUrl("claude-opus-4-8", true)).toBe(
+      "https://api.orbit-provider.com/anthropic/v1/messages",
+    );
+    expect(executor.buildHeaders({ apiKey: "orbit-test-key" })).toMatchObject({
+      "Content-Type": "application/json",
+      "anthropic-version": "2023-06-01",
+      "x-api-key": "orbit-test-key",
+    });
+  });
+
+  it("exposes the configured Opus models and thinking controls", () => {
+    expect((PROVIDER_MODELS.orbit || []).map((model) => model.id)).toEqual([
+      "claude-opus-4-8",
+      "claude-opus-4-7",
+      "claude-opus-4-6",
+      "claude-opus-4-6-thinking",
+    ]);
+    expect(orbit.thinkingConfig).toEqual({
+      options: ["auto", "on", "off"],
+      defaultMode: "auto",
+    });
+  });
+
+  it("validates its API key against the configured Claude endpoint", async () => {
+    const fetchMock = vi.fn().mockResolvedValue({ status: 400 });
+
+    await expect(
+      validateConfiguredClaudeApiKey("orbit-provider", "orbit-test-key", fetchMock),
+    ).resolves.toEqual({ valid: true, error: null });
+    expect(fetchMock).toHaveBeenCalledWith(
+      "https://api.orbit-provider.com/anthropic/v1/messages",
+      expect.objectContaining({
+        method: "POST",
+        headers: expect.objectContaining({
+          "x-api-key": "orbit-test-key",
+          "anthropic-version": "2023-06-01",
+        }),
+      }),
+    );
+    expect(JSON.parse(fetchMock.mock.calls[0][1].body)).toMatchObject({
+      model: "claude-opus-4-8",
+      max_tokens: 1,
+    });
+  });
+
+  it.each([401, 403])("rejects authentication status %i", async (status) => {
+    const fetchMock = vi.fn().mockResolvedValue({ status });
+
+    await expect(
+      validateConfiguredClaudeApiKey("orbit-provider", "bad-key", fetchMock),
+    ).resolves.toEqual({ valid: false, error: "Invalid API key" });
+  });
+});