diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8bb52f15b27..1bc6dfd1dd0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -163,6 +163,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Gateway/OpenRouter: preserve stored session provider when model IDs are vendor-prefixed (for example, `anthropic/...`) so follow-up turns do not incorrectly route to direct provider APIs. (#22753) Thanks @dndodson.
 - Agents/Bootstrap: skip malformed bootstrap files with missing/invalid paths instead of crashing agent sessions; hooks using `filePath` (or non-string `path`) are skipped with a warning. (#22693, #22698) Thanks @arosstale.
 - Security/Agents: cap embedded Pi runner outer retry loop with a higher profile-aware dynamic limit (32-160 attempts) and return an explicit `retry_limit` error payload when retries never converge, preventing unbounded internal retry cycles (`GHSA-76m6-pj3w-v7mf`).
 - Telegram: detect duplicate bot-token ownership across Telegram accounts at startup/status time, mark secondary accounts as not configured with an explicit fix message, and block duplicate account startup before polling to avoid endless `getUpdates` conflict loops.
diff --git a/src/gateway/session-utils.test.ts b/src/gateway/session-utils.test.ts
index 6f08ca6455f..c33ff6f96e5 100644
--- a/src/gateway/session-utils.test.ts
+++ b/src/gateway/session-utils.test.ts
@@ -301,6 +301,28 @@ describe("resolveSessionModelRef", () => {
     expect(resolved).toEqual({ provider: "openai-codex", model: "gpt-5.3-codex" });
   });
 
+  test("preserves openrouter provider when model contains vendor prefix", () => {
+    const cfg = {
+      agents: {
+        defaults: {
+          model: { primary: "openrouter/minimax/minimax-m2.5" },
+        },
+      },
+    } as OpenClawConfig;
+
+    const resolved = resolveSessionModelRef(cfg, {
+      sessionId: "s-or",
+      updatedAt: Date.now(),
+      modelProvider: "openrouter",
+      model: "anthropic/claude-haiku-4.5",
+    });
+
+    expect(resolved).toEqual({
+      provider: "openrouter",
+      model: "anthropic/claude-haiku-4.5",
+    });
+  });
+
   test("falls back to override when runtime model is not recorded yet", () => {
     const cfg = {
       agents: {
diff --git a/src/gateway/session-utils.ts b/src/gateway/session-utils.ts
index fc4decaa688..4876bb95627 100644
--- a/src/gateway/session-utils.ts
+++ b/src/gateway/session-utils.ts
@@ -668,15 +668,20 @@ export function resolveSessionModelRef(
   const runtimeModel = entry?.model?.trim();
   const runtimeProvider = entry?.modelProvider?.trim();
   if (runtimeModel) {
-    const parsedRuntime = parseModelRef(
-      runtimeModel,
-      runtimeProvider || provider || DEFAULT_PROVIDER,
-    );
+    if (runtimeProvider) {
+      // Provider is explicitly recorded — use it directly. Re-parsing the
+      // model string through parseModelRef would incorrectly split OpenRouter
+      // vendor-prefixed model names (e.g. model="anthropic/claude-haiku-4.5"
+      // with provider="openrouter") into { provider: "anthropic" }, discarding
+      // the stored OpenRouter provider and causing direct API calls to a
+      // provider the user has no credentials for.
+      return { provider: runtimeProvider, model: runtimeModel };
+    }
+    const parsedRuntime = parseModelRef(runtimeModel, provider || DEFAULT_PROVIDER);
     if (parsedRuntime) {
       provider = parsedRuntime.provider;
       model = parsedRuntime.model;
     } else {
-      provider = runtimeProvider || provider;
       model = runtimeModel;
     }
     return { provider, model };