diff --git a/extensions/mistral/api.ts b/extensions/mistral/api.ts
index 524af98ef4e..aab786b6eed 100644
--- a/extensions/mistral/api.ts
+++ b/extensions/mistral/api.ts
@@ -12,24 +12,32 @@ export {
 
 const MISTRAL_MAX_TOKENS_FIELD = "max_tokens";
 
+export const MISTRAL_MODEL_COMPAT_PATCH = {
+  supportsStore: false,
+  supportsReasoningEffort: false,
+  maxTokensField: MISTRAL_MAX_TOKENS_FIELD,
+} as const satisfies {
+  supportsStore: boolean;
+  supportsReasoningEffort: boolean;
+  maxTokensField: "max_tokens";
+};
+
 export function applyMistralModelCompat<T extends { compat?: unknown }>(model: T): T {
-  const patch = {
-    supportsStore: false,
-    supportsReasoningEffort: false,
-    maxTokensField: MISTRAL_MAX_TOKENS_FIELD,
-  } satisfies Record<string, unknown>;
   const compat =
     model.compat && typeof model.compat === "object"
       ? (model.compat as Record<string, unknown>)
       : undefined;
-  if (compat && Object.entries(patch).every(([key, value]) => compat[key] === value)) {
+  if (
+    compat &&
+    Object.entries(MISTRAL_MODEL_COMPAT_PATCH).every(([key, value]) => compat[key] === value)
+  ) {
     return model;
   }
   return {
     ...model,
     compat: {
       ...compat,
-      ...patch,
+      ...MISTRAL_MODEL_COMPAT_PATCH,
     } as T extends { compat?: infer TCompat } ? TCompat : never,
   } as T;
 }
diff --git a/extensions/mistral/index.ts b/extensions/mistral/index.ts
index cd02f044d68..e55c37bb2ff 100644
--- a/extensions/mistral/index.ts
+++ b/extensions/mistral/index.ts
@@ -1,10 +1,51 @@
 import { defineSingleProviderPluginEntry } from "openclaw/plugin-sdk/provider-entry";
-import { applyMistralModelCompat } from "./api.js";
+import { applyMistralModelCompat, MISTRAL_MODEL_COMPAT_PATCH } from "./api.js";
 import { mistralMediaUnderstandingProvider } from "./media-understanding-provider.js";
 import { applyMistralConfig, MISTRAL_DEFAULT_MODEL_REF } from "./onboard.js";
 import { buildMistralProvider } from "./provider-catalog.js";
 
 const PROVIDER_ID = "mistral";
+const MISTRAL_MODEL_HINTS = [
+  "mistral",
+  "mistralai",
+  "mixtral",
+  "codestral",
+  "pixtral",
+  "devstral",
+  "ministral",
+] as const;
+
+function isMistralBaseUrl(baseUrl: unknown): boolean {
+  if (typeof baseUrl !== "string" || !baseUrl.trim()) {
+    return false;
+  }
+  try {
+    return new URL(baseUrl).hostname.toLowerCase() === "api.mistral.ai";
+  } catch {
+    return baseUrl.toLowerCase().includes("api.mistral.ai");
+  }
+}
+
+function isMistralModelHint(modelId: string): boolean {
+  const normalized = modelId.trim().toLowerCase();
+  return MISTRAL_MODEL_HINTS.some(
+    (hint) =>
+      normalized === hint ||
+      normalized.startsWith(`${hint}/`) ||
+      normalized.startsWith(`${hint}-`) ||
+      normalized.startsWith(`${hint}:`),
+  );
+}
+
+function shouldContributeMistralCompat(params: {
+  modelId: string;
+  model: { api?: unknown; baseUrl?: unknown };
+}): boolean {
+  if (params.model.api !== "openai-completions") {
+    return false;
+  }
+  return isMistralBaseUrl(params.model.baseUrl) || isMistralModelHint(params.modelId);
+}
 
 export default defineSingleProviderPluginEntry({
   id: PROVIDER_ID,
@@ -34,6 +75,8 @@ export default defineSingleProviderPluginEntry({
       allowExplicitBaseUrl: true,
     },
     normalizeResolvedModel: ({ model }) => applyMistralModelCompat(model),
+    contributeResolvedModelCompat: ({ modelId, model }) =>
+      shouldContributeMistralCompat({ modelId, model }) ? MISTRAL_MODEL_COMPAT_PATCH : undefined,
     capabilities: {
       transcriptToolCallIdMode: "strict9",
       transcriptToolCallIdModelHints: [
diff --git a/src/agents/pi-embedded-runner/model.startup-retry.test.ts b/src/agents/pi-embedded-runner/model.startup-retry.test.ts
index 1cfa0ae4609..e576fb8730c 100644
--- a/src/agents/pi-embedded-runner/model.startup-retry.test.ts
+++ b/src/agents/pi-embedded-runner/model.startup-retry.test.ts
@@ -41,6 +41,7 @@ vi.mock("../../plugins/provider-runtime.js", async (importOriginal) => {
   const actual = await importOriginal<typeof import("../../plugins/provider-runtime.js")>();
   return {
     ...actual,
+    applyProviderResolvedModelCompatWithPlugins: () => undefined,
     clearProviderRuntimeHookCache: clearProviderRuntimeHookCacheMock,
     normalizeProviderResolvedModelWithPlugin: () => undefined,
     prepareProviderDynamicModel: (params: unknown) => prepareProviderDynamicModelMock(params),
diff --git a/src/agents/pi-embedded-runner/model.test.ts b/src/agents/pi-embedded-runner/model.test.ts
index 41782e6a3ab..001a1508557 100644
--- a/src/agents/pi-embedded-runner/model.test.ts
+++ b/src/agents/pi-embedded-runner/model.test.ts
@@ -1044,6 +1044,7 @@ describe("resolveModel", () => {
       authStorage: { mocked: true } as never,
       modelRegistry: discoverModels({ mocked: true } as never, "/tmp/agent"),
       runtimeHooks: {
+        applyProviderResolvedModelCompatWithPlugins: () => undefined,
         buildProviderUnknownModelHintWithPlugin: () => undefined,
         prepareProviderDynamicModel: async () => {},
         runProviderDynamicModel: () => undefined,
diff --git a/src/agents/pi-embedded-runner/model.ts b/src/agents/pi-embedded-runner/model.ts
index e7490fc3ed5..46846c73716 100644
--- a/src/agents/pi-embedded-runner/model.ts
+++ b/src/agents/pi-embedded-runner/model.ts
@@ -3,6 +3,7 @@ import type { AuthStorage, ModelRegistry } from "@mariozechner/pi-coding-agent";
 import type { OpenClawConfig } from "../../config/config.js";
 import type { ModelDefinitionConfig } from "../../config/types.js";
 import {
+  applyProviderResolvedModelCompatWithPlugins,
   buildProviderUnknownModelHintWithPlugin,
   clearProviderRuntimeHookCache,
   normalizeProviderTransportWithPlugin,
@@ -36,6 +37,9 @@ type InlineProviderConfig = {
 };
 
 type ProviderRuntimeHooks = {
+  applyProviderResolvedModelCompatWithPlugins?: (
+    params: Parameters<typeof applyProviderResolvedModelCompatWithPlugins>[0],
+  ) => unknown;
   buildProviderUnknownModelHintWithPlugin: (
     params: Parameters<typeof buildProviderUnknownModelHintWithPlugin>[0],
   ) => string | undefined;
@@ -52,6 +56,7 @@ type ProviderRuntimeHooks = {
 };
 
 const DEFAULT_PROVIDER_RUNTIME_HOOKS: ProviderRuntimeHooks = {
+  applyProviderResolvedModelCompatWithPlugins,
   buildProviderUnknownModelHintWithPlugin,
   prepareProviderDynamicModel,
   runProviderDynamicModel,
@@ -121,9 +126,20 @@ function normalizeResolvedModel(params: {
       model: normalizedInputModel,
     },
   }) as Model<Api> | undefined;
+  const compatNormalized = runtimeHooks.applyProviderResolvedModelCompatWithPlugins?.({
+    provider: params.provider,
+    config: params.cfg,
+    context: {
+      config: params.cfg,
+      agentDir: params.agentDir,
+      provider: params.provider,
+      modelId: normalizedInputModel.id,
+      model: (pluginNormalized ?? normalizedInputModel) as never,
+    },
+  }) as Model<Api> | undefined;
   return normalizeResolvedProviderModel({
     provider: params.provider,
-    model: pluginNormalized ?? normalizedInputModel,
+    model: compatNormalized ?? pluginNormalized ?? normalizedInputModel,
   });
 }
 
diff --git a/src/agents/pi-model-discovery.auth.test.ts b/src/agents/pi-model-discovery.auth.test.ts
index 1ec27d2a519..85c9a05192e 100644
--- a/src/agents/pi-model-discovery.auth.test.ts
+++ b/src/agents/pi-model-discovery.auth.test.ts
@@ -273,4 +273,111 @@ describe("discoverAuthStorage", () => {
       }
     });
   });
+
+  it("normalizes discovered Mistral compat flags for custom Mistral-hosted providers", async () => {
+    await withAgentDir(async (agentDir) => {
+      saveAuthProfileStore(
+        {
+          version: 1,
+          profiles: {
+            "custom-api-mistral-ai:default": {
+              type: "api_key",
+              provider: "custom-api-mistral-ai",
+              key: "mistral-custom-key",
+            },
+          },
+        },
+        agentDir,
+      );
+      await writeModelsJson(agentDir, {
+        providers: {
+          "custom-api-mistral-ai": {
+            api: "openai-completions",
+            baseUrl: "https://api.mistral.ai/v1",
+            apiKey: "custom-api-mistral-ai",
+            models: [
+              {
+                id: "mistral-small-latest",
+                name: "Mistral Small",
+                reasoning: true,
+                input: ["text"],
+                cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+                contextWindow: 262144,
+                maxTokens: 16384,
+              },
+            ],
+          },
+        },
+      });
+
+      const authStorage = discoverAuthStorage(agentDir);
+      const modelRegistry = discoverModels(authStorage, agentDir);
+      const model = modelRegistry.find("custom-api-mistral-ai", "mistral-small-latest") as {
+        compat?: {
+          supportsStore?: boolean;
+          supportsReasoningEffort?: boolean;
+          maxTokensField?: string;
+        };
+      } | null;
+
+      expect(model?.compat?.supportsStore).toBe(false);
+      expect(model?.compat?.supportsReasoningEffort).toBe(false);
+      expect(model?.compat?.maxTokensField).toBe("max_tokens");
+    });
+  });
+
+  it("normalizes discovered Mistral compat flags for OpenRouter Mistral model ids", async () => {
+    await withAgentDir(async (agentDir) => {
+      saveAuthProfileStore(
+        {
+          version: 1,
+          profiles: {
+            "openrouter:default": {
+              type: "api_key",
+              provider: "openrouter",
+              key: "sk-or-v1-runtime",
+            },
+          },
+        },
+        agentDir,
+      );
+      await writeModelsJson(agentDir, {
+        providers: {
+          openrouter: {
+            api: "openai-completions",
+            baseUrl: "https://openrouter.ai/api/v1",
+            apiKey: "OPENROUTER_API_KEY",
+            models: [
+              {
+                id: "mistralai/mistral-small-3.2-24b-instruct",
+                name: "Mistral Small via OpenRouter",
+                reasoning: true,
+                input: ["text"],
+                cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+                contextWindow: 262144,
+                maxTokens: 16384,
+              },
+            ],
+          },
+        },
+      });
+
+      const authStorage = discoverAuthStorage(agentDir);
+      const modelRegistry = discoverModels(authStorage, agentDir);
+      const model = modelRegistry.find(
+        "openrouter",
+        "mistralai/mistral-small-3.2-24b-instruct",
+      ) as {
+        compat?: {
+          supportsStore?: boolean;
+          supportsReasoningEffort?: boolean;
+          maxTokensField?: string;
+        };
+      } | null;
+
+      expect(model?.compat?.supportsStore).toBe(false);
+      expect(model?.compat?.supportsReasoningEffort).toBe(false);
+      expect(model?.compat?.maxTokensField).toBe("max_tokens");
+    });
+  });
 });
diff --git a/src/agents/pi-model-discovery.ts b/src/agents/pi-model-discovery.ts
index 7b6c17b30ee..074853c20a4 100644
--- a/src/agents/pi-model-discovery.ts
+++ b/src/agents/pi-model-discovery.ts
@@ -7,7 +7,10 @@ import type {
   ModelRegistry as PiModelRegistry,
 } from "@mariozechner/pi-coding-agent";
 import { normalizeModelCompat } from "../plugins/provider-model-compat.js";
-import { normalizeProviderResolvedModelWithPlugin } from "../plugins/provider-runtime.js";
+import {
+  applyProviderResolvedModelCompatWithPlugins,
+  normalizeProviderResolvedModelWithPlugin,
+} from "../plugins/provider-runtime.js";
 import type { ProviderRuntimeModel } from "../plugins/types.js";
 import { ensureAuthProfileStore } from "./auth-profiles.js";
 import { PROVIDER_ENV_API_KEY_CANDIDATES } from "./model-auth-env-vars.js";
@@ -75,7 +78,17 @@ function normalizeRegistryModel<T>(value: T, agentDir: string): T {
         agentDir,
       },
     }) ?? model;
-  return normalizeModelCompat(pluginNormalized as Model<Api>) as T;
+  const compatNormalized =
+    applyProviderResolvedModelCompatWithPlugins({
+      provider: model.provider,
+      context: {
+        provider: model.provider,
+        modelId: model.id,
+        model: pluginNormalized,
+        agentDir,
+      },
+    }) ?? pluginNormalized;
+  return normalizeModelCompat(compatNormalized as Model<Api>) as T;
 }
 
 class OpenClawModelRegistry extends PiModelRegistryClass {
diff --git a/src/plugins/provider-runtime.test.ts b/src/plugins/provider-runtime.test.ts
index 7c5e5686738..fc15b5751ba 100644
--- a/src/plugins/provider-runtime.test.ts
+++ b/src/plugins/provider-runtime.test.ts
@@ -29,6 +29,7 @@ let applyProviderNativeStreamingUsageCompatWithPlugin: typeof import("./provider
 let formatProviderAuthProfileApiKeyWithPlugin: typeof import("./provider-runtime.js").formatProviderAuthProfileApiKeyWithPlugin;
 let normalizeProviderConfigWithPlugin: typeof import("./provider-runtime.js").normalizeProviderConfigWithPlugin;
 let normalizeProviderModelIdWithPlugin: typeof import("./provider-runtime.js").normalizeProviderModelIdWithPlugin;
+let applyProviderResolvedModelCompatWithPlugins: typeof import("./provider-runtime.js").applyProviderResolvedModelCompatWithPlugins;
 let normalizeProviderTransportWithPlugin: typeof import("./provider-runtime.js").normalizeProviderTransportWithPlugin;
 let prepareProviderExtraParams: typeof import("./provider-runtime.js").prepareProviderExtraParams;
 let resolveProviderConfigApiKeyWithPlugin: typeof import("./provider-runtime.js").resolveProviderConfigApiKeyWithPlugin;
@@ -211,6 +212,7 @@ describe("provider-runtime", () => {
       buildProviderMissingAuthMessageWithPlugin,
       buildProviderUnknownModelHintWithPlugin,
       applyProviderNativeStreamingUsageCompatWithPlugin,
+      applyProviderResolvedModelCompatWithPlugins,
       formatProviderAuthProfileApiKeyWithPlugin,
       normalizeProviderConfigWithPlugin,
       normalizeProviderModelIdWithPlugin,
@@ -727,6 +729,13 @@ describe("provider-runtime", () => {
       api: "openai-codex-responses",
     });
 
+    expect(
+      applyProviderResolvedModelCompatWithPlugins({
+        provider: DEMO_PROVIDER_ID,
+        context: createDemoResolvedModelContext({}),
+      }),
+    ).toBeUndefined();
+
     expect(
       formatProviderAuthProfileApiKeyWithPlugin({
         provider: DEMO_PROVIDER_ID,
@@ -854,6 +863,53 @@ describe("provider-runtime", () => {
     );
   });
 
+  it("merges compat contributions from owner and foreign provider plugins", () => {
+    resolveOwningPluginIdsForProviderMock.mockReturnValue(["openrouter"]);
+    resolvePluginProvidersMock.mockImplementation((params) => {
+      const onlyPluginIds = params.onlyPluginIds ?? [];
+      const plugins: ProviderPlugin[] = [
+        {
+          id: "openrouter",
+          label: "OpenRouter",
+          auth: [],
+          contributeResolvedModelCompat: () => ({ supportsStrictMode: true }),
+        },
+        {
+          id: "mistral",
+          label: "Mistral",
+          auth: [],
+          contributeResolvedModelCompat: ({ modelId }) =>
+            modelId.startsWith("mistralai/") ? { supportsStore: false } : undefined,
+        },
+      ];
+      return onlyPluginIds.length > 0
+        ? plugins.filter((plugin) => onlyPluginIds.includes(plugin.id))
+        : plugins;
+    });
+
+    expect(
+      applyProviderResolvedModelCompatWithPlugins({
+        provider: "openrouter",
+        context: createDemoResolvedModelContext({
+          provider: "openrouter",
+          modelId: "mistralai/mistral-small-3.2-24b-instruct",
+          model: {
+            ...MODEL,
+            provider: "openrouter",
+            id: "mistralai/mistral-small-3.2-24b-instruct",
+            compat: { supportsDeveloperRole: false },
+          },
+        }),
+      }),
+    ).toMatchObject({
+      compat: {
+        supportsDeveloperRole: false,
+        supportsStrictMode: true,
+        supportsStore: false,
+      },
+    });
+  });
+
   it("resolves bundled catalog hooks through provider plugins", async () => {
     resolveCatalogHookProviderPluginIdsMock.mockReturnValue(["openai"]);
     resolvePluginProvidersMock.mockImplementation((params?: { onlyPluginIds?: string[] }) => {
diff --git a/src/plugins/provider-runtime.ts b/src/plugins/provider-runtime.ts
index e029b6be2a9..e8a43ba67f2 100644
--- a/src/plugins/provider-runtime.ts
+++ b/src/plugins/provider-runtime.ts
@@ -22,6 +22,7 @@ import type {
   ProviderFetchUsageSnapshotContext,
   ProviderNormalizeConfigContext,
   ProviderNormalizeModelIdContext,
+  ProviderNormalizeResolvedModelContext,
   ProviderNormalizeTransportContext,
   ProviderModernModelPolicyContext,
   ProviderPrepareExtraParamsContext,
@@ -224,6 +225,79 @@ export function normalizeProviderResolvedModelWithPlugin(params: {
   );
 }
 
+function resolveProviderCompatHookPlugins(params: {
+  provider: string;
+  config?: OpenClawConfig;
+  workspaceDir?: string;
+  env?: NodeJS.ProcessEnv;
+}): ProviderPlugin[] {
+  const candidates = resolveProviderPluginsForHooks(params);
+  const owner = resolveProviderRuntimePlugin(params);
+  if (!owner) {
+    return candidates;
+  }
+
+  const ordered = [owner, ...candidates];
+  const seen = new Set<string>();
+  return ordered.filter((candidate) => {
+    const key = `${candidate.pluginId ?? ""}:${candidate.id}`;
+    if (seen.has(key)) {
+      return false;
+    }
+    seen.add(key);
+    return true;
+  });
+}
+
+function applyCompatPatchToModel(
+  model: ProviderRuntimeModel,
+  patch: Record<string, unknown>,
+): ProviderRuntimeModel {
+  const compat =
+    model.compat && typeof model.compat === "object"
+      ? (model.compat as Record<string, unknown>)
+      : undefined;
+  if (Object.entries(patch).every(([key, value]) => compat?.[key] === value)) {
+    return model;
+  }
+  return {
+    ...model,
+    compat: {
+      ...compat,
+      ...patch,
+    },
+  };
+}
+
+export function applyProviderResolvedModelCompatWithPlugins(params: {
+  provider: string;
+  config?: OpenClawConfig;
+  workspaceDir?: string;
+  env?: NodeJS.ProcessEnv;
+  context: ProviderNormalizeResolvedModelContext;
+}): ProviderRuntimeModel | undefined {
+  let nextModel = params.context.model;
+  let changed = false;
+
+  for (const plugin of resolveProviderCompatHookPlugins(params)) {
+    const patch = plugin.contributeResolvedModelCompat?.({
+      ...params.context,
+      model: nextModel,
+    });
+    if (!patch || typeof patch !== "object") {
+      continue;
+    }
+    const patchedModel = applyCompatPatchToModel(nextModel, patch as Record<string, unknown>);
+    if (patchedModel === nextModel) {
+      continue;
+    }
+    nextModel = patchedModel;
+    changed = true;
+  }
+
+  return changed ? nextModel : undefined;
+}
+
 function resolveProviderHookPlugin(params: {
   provider: string;
   config?: OpenClawConfig;
diff --git a/src/plugins/types.ts b/src/plugins/types.ts
index da606058f4c..bc2e0511b53 100644
--- a/src/plugins/types.ts
+++ b/src/plugins/types.ts
@@ -26,6 +26,7 @@ import type {
   ModelProviderAuthMode,
   ModelProviderConfig,
 } from "../config/types.js";
+import type { ModelCompatConfig } from "../config/types.models.js";
 import type { OperatorScope } from "../gateway/method-scopes.js";
 import type { GatewayRequestHandler } from "../gateway/server-methods/types.js";
 import type { InternalHookHandler } from "../hooks/internal-hooks.js";
@@ -885,6 +886,17 @@ export type ProviderPlugin = {
   normalizeResolvedModel?: (
     ctx: ProviderNormalizeResolvedModelContext,
   ) => ProviderRuntimeModel | null | undefined;
+  /**
+   * Provider-owned compat contribution for resolved models outside direct
+   * provider ownership.
+   *
+   * Use this when a plugin can recognize its vendor's models behind another
+   * OpenAI-compatible transport (for example OpenRouter or a custom base URL)
+   * and needs to contribute compat flags without taking over the provider.
+   */
+  contributeResolvedModelCompat?: (
+    ctx: ProviderNormalizeResolvedModelContext,
+  ) => Partial<ModelCompatConfig> | null | undefined;
   /**
    * Provider-owned model-id normalization.
    *