diff --git a/src/lib/init/tools/create-sentry-project.ts b/src/lib/init/tools/create-sentry-project.ts
index 88f118abe..a0735e927 100644
--- a/src/lib/init/tools/create-sentry-project.ts
+++ b/src/lib/init/tools/create-sentry-project.ts
@@ -1,4 +1,5 @@
 import { createProjectWithDsn } from "../../api-client.js";
+import { ApiError } from "../../errors.js";
 import { resolveOrCreateTeam } from "../../resolve-team.js";
 import { slugify } from "../../utils.js";
 import { tryGetExistingProjectData } from "../existing-project.js";
@@ -72,15 +73,30 @@ export async function createSentryProject(
       };
     }
 
-    const { project, dsn, url } = await createProjectWithDsn(
-      context.org,
-      teamSlug,
-      {
+    let createdProject: Awaited<ReturnType<typeof createProjectWithDsn>>;
+    try {
+      createdProject = await createProjectWithDsn(context.org, teamSlug, {
         name,
         platform: payload.params.platform,
+      });
+    } catch (error) {
+      // Platform slug rejected by the API — retry without it. The platform
+      // label is cosmetic: the wizard installs the correct SDK and generates
+      // the right code regardless of the project's platform tag.
+      if (
+        error instanceof ApiError &&
+        error.status === 400 &&
+        error.detail?.includes('"platform"')
+      ) {
+        createdProject = await createProjectWithDsn(context.org, teamSlug, {
+          name,
+        });
+      } else {
+        throw error;
       }
-    );
+    }
 
+    const { project, dsn, url } = createdProject;
     return {
       ok: true,
       data: {
diff --git a/test/lib/init/tools/create-sentry-project.test.ts b/test/lib/init/tools/create-sentry-project.test.ts
index 7916d7de0..600470696 100644
--- a/test/lib/init/tools/create-sentry-project.test.ts
+++ b/test/lib/init/tools/create-sentry-project.test.ts
@@ -193,6 +193,45 @@ describe("createSentryProject", () => {
     expect(createProjectWithDsnSpy).not.toHaveBeenCalled();
   });
 
+  test("retries without platform when API rejects the platform slug", async () => {
+    getProjectSpy.mockRejectedValueOnce(new ApiError("Not found", 404));
+    createProjectWithDsnSpy
+      .mockRejectedValueOnce(
+        new ApiError(
+          "Failed to create project: 400 Bad Request",
+          400,
+          '{"platform":["Invalid platform"]}'
+        )
+      )
+      .mockResolvedValueOnce({
+        project: { id: "42", slug: "my-app", name: "my-app" } as any,
+        dsn: "https://abc@o1.ingest.sentry.io/42",
+        url: "https://sentry.io/settings/acme/projects/my-app/",
+      });
+
+    const result = await createSentryProject(
+      makePayload({ platform: "javascript-hono" }),
+      { dryRun: false, org: "acme", team: "platform", project: undefined }
+    );
+
+    expect(result.ok).toBe(true);
+    expect(createProjectWithDsnSpy).toHaveBeenCalledTimes(2);
+    // First call with the original (rejected) platform
+    expect(createProjectWithDsnSpy).toHaveBeenNthCalledWith(
+      1,
+      "acme",
+      "platform",
+      expect.objectContaining({ platform: "javascript-hono" })
+    );
+    // Retry without platform
+    expect(createProjectWithDsnSpy).toHaveBeenNthCalledWith(
+      2,
+      "acme",
+      "platform",
+      expect.not.objectContaining({ platform: expect.anything() })
+    );
+  });
+
   test("resolves the team at project creation time when preflight deferred it", async () => {
     getProjectSpy.mockRejectedValueOnce(new ApiError("Not found", 404));