diff --git a/lib/recoupable/__tests__/extractOrgRepoName.test.ts b/lib/recoupable/__tests__/extractOrgRepoName.test.ts
new file mode 100644
index 00000000..8f5b2c9a
--- /dev/null
+++ b/lib/recoupable/__tests__/extractOrgRepoName.test.ts
@@ -0,0 +1,36 @@
+import { describe, it, expect } from "vitest";
+import { extractOrgRepoName } from "@/lib/recoupable/extractOrgRepoName";
+
+describe("extractOrgRepoName", () => {
+  it("extracts the repo name from a recoupable org clone URL", () => {
+    expect(extractOrgRepoName("https://github.com/recoupable/org-rostrum-pacific-abc123")).toBe(
+      "org-rostrum-pacific-abc123",
+    );
+  });
+
+  it("strips a trailing .git suffix", () => {
+    expect(extractOrgRepoName("https://github.com/recoupable/myorg.git")).toBe("myorg");
+  });
+
+  it("strips a trailing slash", () => {
+    expect(extractOrgRepoName("https://github.com/recoupable/myorg/")).toBe("myorg");
+  });
+
+  it("returns null for non-recoupable orgs", () => {
+    expect(extractOrgRepoName("https://github.com/someoneelse/repo")).toBeNull();
+  });
+
+  it("returns null for nested paths beyond the repo segment", () => {
+    expect(extractOrgRepoName("https://github.com/recoupable/repo/blob/main/x")).toBeNull();
+  });
+
+  it("returns null for non-GitHub URLs", () => {
+    expect(extractOrgRepoName("https://gitlab.com/recoupable/repo")).toBeNull();
+    expect(extractOrgRepoName("not-a-url")).toBeNull();
+  });
+
+  it("returns null for the org root with no repo", () => {
+    expect(extractOrgRepoName("https://github.com/recoupable/")).toBeNull();
+    expect(extractOrgRepoName("https://github.com/recoupable")).toBeNull();
+  });
+});
diff --git a/lib/recoupable/extractOrgRepoName.ts b/lib/recoupable/extractOrgRepoName.ts
new file mode 100644
index 00000000..a033fdb6
--- /dev/null
+++ b/lib/recoupable/extractOrgRepoName.ts
@@ -0,0 +1,19 @@
+const ORG_REPO_URL_PATTERN = /^https:\/\/github\.com\/recoupable\/([^/]+?)(?:\.git)?\/?$/;
+
+/**
+ * Extracts the repo name from a Recoupable org clone URL. The repo
+ * name is used as a `sandboxName` to look up per-org base snapshots
+ * built by the build-org-snapshot workflow — finding one warm-boots
+ * the sandbox in seconds instead of paying the ~75s full-clone path.
+ *
+ * Example: `https://github.com/recoupable/org-rostrum-pacific-<uuid>`
+ *   → `org-rostrum-pacific-<uuid>`
+ *
+ * @param cloneUrl - The repo URL the caller wants to clone.
+ * @returns The repo name when the URL is under the recoupable org,
+ *   otherwise null. Non-recoupable repos skip the snapshot lookup.
+ */
+export function extractOrgRepoName(cloneUrl: string): string | null {
+  const match = cloneUrl.match(ORG_REPO_URL_PATTERN);
+  return match?.[1] ?? null;
+}
diff --git a/lib/sandbox/__tests__/createSandboxHandler.test.ts b/lib/sandbox/__tests__/createSandboxHandler.test.ts
index d257f9b3..dbc49eff 100644
--- a/lib/sandbox/__tests__/createSandboxHandler.test.ts
+++ b/lib/sandbox/__tests__/createSandboxHandler.test.ts
@@ -7,6 +7,7 @@ import { selectSessions } from "@/lib/supabase/sessions/selectSessions";
 import { connectSandbox } from "@/lib/sandbox/factory";
 import { updateSession } from "@/lib/supabase/sessions/updateSession";
 import { installSessionGlobalSkills } from "@/lib/sandbox/installSessionGlobalSkills";
+import { findOrgSnapshot } from "@/lib/sandbox/findOrgSnapshot";
 
 vi.mock("@/lib/networking/getCorsHeaders", () => ({
   getCorsHeaders: () => ({ "Access-Control-Allow-Origin": "*" }),
@@ -29,6 +30,9 @@ vi.mock("@/lib/github/getServiceGithubToken", () => ({
 vi.mock("@/lib/sandbox/installSessionGlobalSkills", () => ({
   installSessionGlobalSkills: vi.fn(async () => undefined),
 }));
+vi.mock("@/lib/sandbox/findOrgSnapshot", () => ({
+  findOrgSnapshot: vi.fn(async () => null),
+}));
 
 const ACCOUNT_ID = "acc-1";
 
@@ -167,6 +171,65 @@ describe("createSandboxHandler", () => {
     expect(res.status).toBe(200);
   });
 
+  it("looks up an org snapshot and plumbs its id into baseSnapshotId when the repo is a recoupable org repo", async () => {
+    vi.mocked(validateCreateSandboxBody).mockResolvedValueOnce({
+      body: {
+        repoUrl: "https://github.com/recoupable/org-acme-xyz",
+        sessionId: "sess-1",
+      },
+      auth: { accountId: ACCOUNT_ID, orgId: null, authToken: "k" },
+    });
+    vi.mocked(findOrgSnapshot).mockResolvedValueOnce("snap_abc123");
+
+    await createSandboxHandler(makeReq());
+
+    expect(findOrgSnapshot).toHaveBeenCalledWith("org-acme-xyz");
+    const arg = vi.mocked(connectSandbox).mock.calls[0]?.[0];
+    if (!arg || !("options" in arg)) throw new Error("expected new-API config shape");
+    if (!("state" in arg)) throw new Error("expected new-API state shape");
+    expect(arg.options?.baseSnapshotId).toBe("snap_abc123");
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    expect((arg.state as any).source.prebuilt).toBe(true);
+  });
+
+  it("skips the snapshot lookup entirely for non-recoupable repos", async () => {
+    vi.mocked(validateCreateSandboxBody).mockResolvedValueOnce({
+      body: {
+        repoUrl: "https://github.com/someoneelse/repo",
+        sessionId: "sess-1",
+      },
+      auth: { accountId: ACCOUNT_ID, orgId: null, authToken: "k" },
+    });
+
+    await createSandboxHandler(makeReq());
+
+    expect(findOrgSnapshot).not.toHaveBeenCalled();
+    const arg = vi.mocked(connectSandbox).mock.calls[0]?.[0];
+    if (!arg || !("options" in arg)) throw new Error("expected new-API config shape");
+    expect(arg.options?.baseSnapshotId).toBeUndefined();
+  });
+
+  it("does not pass baseSnapshotId when the org snapshot lookup misses", async () => {
+    vi.mocked(validateCreateSandboxBody).mockResolvedValueOnce({
+      body: {
+        repoUrl: "https://github.com/recoupable/org-no-snap-yet",
+        sessionId: "sess-1",
+      },
+      auth: { accountId: ACCOUNT_ID, orgId: null, authToken: "k" },
+    });
+    vi.mocked(findOrgSnapshot).mockResolvedValueOnce(null);
+
+    await createSandboxHandler(makeReq());
+
+    expect(findOrgSnapshot).toHaveBeenCalledWith("org-no-snap-yet");
+    const arg = vi.mocked(connectSandbox).mock.calls[0]?.[0];
+    if (!arg || !("options" in arg)) throw new Error("expected new-API config shape");
+    if (!("state" in arg)) throw new Error("expected new-API state shape");
+    expect(arg.options?.baseSnapshotId).toBeUndefined();
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    expect((arg.state as any).source.prebuilt).toBe(false);
+  });
+
   it("does not attempt skill installation when no sessionId is provided", async () => {
     vi.mocked(validateCreateSandboxBody).mockResolvedValueOnce({
       body: { repoUrl: "https://github.com/o/r" },
diff --git a/lib/sandbox/__tests__/findOrgSnapshot.test.ts b/lib/sandbox/__tests__/findOrgSnapshot.test.ts
new file mode 100644
index 00000000..bd992310
--- /dev/null
+++ b/lib/sandbox/__tests__/findOrgSnapshot.test.ts
@@ -0,0 +1,55 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { findOrgSnapshot } from "@/lib/sandbox/findOrgSnapshot";
+import { Snapshot } from "@vercel/sandbox";
+
+vi.mock("@vercel/sandbox", () => ({
+  Snapshot: { list: vi.fn() },
+}));
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+describe("findOrgSnapshot", () => {
+  it("returns the id of the most recent created snapshot", async () => {
+    vi.mocked(Snapshot.list).mockResolvedValue({
+      snapshots: [
+        { id: "snap_A", status: "creating" },
+        { id: "snap_B", status: "created" },
+        { id: "snap_C", status: "created" },
+      ],
+    } as never);
+
+    const id = await findOrgSnapshot("org-x");
+    // Returns the FIRST created snapshot in the list (sortOrder desc means first = newest).
+    expect(id).toBe("snap_B");
+  });
+
+  it("calls Snapshot.list with the supplied name and a desc sort order", async () => {
+    vi.mocked(Snapshot.list).mockResolvedValue({ snapshots: [] } as never);
+
+    await findOrgSnapshot("org-y");
+
+    expect(Snapshot.list).toHaveBeenCalledWith(
+      expect.objectContaining({ name: "org-y", sortOrder: "desc" }),
+    );
+  });
+
+  it("returns null when no snapshots are in the 'created' state", async () => {
+    vi.mocked(Snapshot.list).mockResolvedValue({
+      snapshots: [{ id: "snap_pending", status: "creating" }],
+    } as never);
+
+    expect(await findOrgSnapshot("org-z")).toBeNull();
+  });
+
+  it("returns null when the API returns no snapshots", async () => {
+    vi.mocked(Snapshot.list).mockResolvedValue({ snapshots: [] } as never);
+    expect(await findOrgSnapshot("org-empty")).toBeNull();
+  });
+
+  it("returns null when Snapshot.list throws", async () => {
+    vi.mocked(Snapshot.list).mockRejectedValue(new Error("vercel api down"));
+    expect(await findOrgSnapshot("org-err")).toBeNull();
+  });
+});
diff --git a/lib/sandbox/createSandboxHandler.ts b/lib/sandbox/createSandboxHandler.ts
index 00891e4c..01e5f499 100644
--- a/lib/sandbox/createSandboxHandler.ts
+++ b/lib/sandbox/createSandboxHandler.ts
@@ -4,8 +4,10 @@ import { getCorsHeaders } from "@/lib/networking/getCorsHeaders";
 import { validateCreateSandboxBody } from "@/lib/sandbox/validateCreateSandboxBody";
 import { selectSessions } from "@/lib/supabase/sessions/selectSessions";
 import { connectSandbox } from "@/lib/sandbox/factory";
+import { findOrgSnapshot } from "@/lib/sandbox/findOrgSnapshot";
 import { getSessionSandboxName } from "@/lib/sandbox/getSessionSandboxName";
 import { installSessionGlobalSkills } from "@/lib/sandbox/installSessionGlobalSkills";
+import { extractOrgRepoName } from "@/lib/recoupable/extractOrgRepoName";
 import { updateSession } from "@/lib/supabase/sessions/updateSession";
 import { getServiceGithubToken } from "@/lib/github/getServiceGithubToken";
 import type { Json, Tables } from "@/types/database.types";
@@ -57,6 +59,14 @@ export async function createSandboxHandler(request: NextRequest): Promise<NextRe
   }
 
   const sandboxName = sessionId ? getSessionSandboxName(sessionId) : undefined;
+
+  // Per-org base snapshot lookup — saves ~75s on cold start when found.
+  // Skipped entirely for non-recoupable repos so this only costs latency
+  // for the case where it can pay off. A miss falls through to default
+  // sandbox provisioning; an error is logged and treated as a miss.
+  const orgRepoName = extractOrgRepoName(body.repoUrl);
+  const orgSnapshotId = orgRepoName ? await findOrgSnapshot(orgRepoName) : null;
+
   const startTime = Date.now();
 
   let sandbox;
@@ -65,12 +75,19 @@ export async function createSandboxHandler(request: NextRequest): Promise<NextRe
       state: {
         type: "vercel",
         ...(sandboxName ? { sandboxName } : {}),
-        source: { repo: body.repoUrl },
+        // `prebuilt: true` when restoring from an org snapshot tells the
+        // Vercel sandbox runtime to skip the fresh `git clone` and instead
+        // `git fetch` + `git reset --hard` the repo that's already inside
+        // the snapshot. Without this flag, Vercel treats the snapshot as a
+        // base image and tries to clone fresh on top — which often fails
+        // for private repos and definitely defeats the warm-boot benefit.
+        source: { repo: body.repoUrl, prebuilt: !!orgSnapshotId },
       },
       options: {
         timeout: DEFAULT_TIMEOUT_MS,
         ports: DEFAULT_PORTS,
         githubToken: getServiceGithubToken(),
+        ...(orgSnapshotId ? { baseSnapshotId: orgSnapshotId } : {}),
         persistent: !!sandboxName,
         resume: !!sandboxName,
         createIfMissing: !!sandboxName,
diff --git a/lib/sandbox/findOrgSnapshot.ts b/lib/sandbox/findOrgSnapshot.ts
new file mode 100644
index 00000000..59fa7e6d
--- /dev/null
+++ b/lib/sandbox/findOrgSnapshot.ts
@@ -0,0 +1,32 @@
+import { Snapshot } from "@vercel/sandbox";
+
+/**
+ * Looks up the most recent ready snapshot whose source sandbox name
+ * matches `sandboxName`. Used by `POST /api/sandbox` to warm-boot
+ * recoupable org sessions from a per-org base snapshot when one
+ * exists, instead of paying the full-clone cold-start path.
+ *
+ * Returns the snapshot id, or `null` when no `created` snapshot
+ * exists yet or when the upstream call throws — callers always have
+ * a safe fallback to default sandbox provisioning.
+ *
+ * @param sandboxName - The org repo name returned by `extractOrgRepoName`.
+ * @returns The snapshot id, or null on miss / error.
+ */
+export async function findOrgSnapshot(sandboxName: string): Promise<string | null> {
+  try {
+    const result = await Snapshot.list({
+      name: sandboxName,
+      sortOrder: "desc",
+      limit: 5,
+    });
+    const ready = result.snapshots.find(s => s.status === "created");
+    console.log(
+      `[findOrgSnapshot] '${sandboxName}' → ${ready ? `hit ${ready.id}` : "miss"} (${result.snapshots.length} total snapshots returned)`,
+    );
+    return ready?.id ?? null;
+  } catch (error) {
+    console.error(`[findOrgSnapshot] failed to list snapshots for '${sandboxName}':`, error);
+    return null;
+  }
+}