diff --git a/CHANGELOG.md b/CHANGELOG.md
index 460dd2ad7f8..0b257f2fbe8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Docs: https://docs.openclaw.ai
 ### Changes
 
 - Google/Gemini: normalize retired `google/gemini-3-pro-preview` and `google-gemini-cli/gemini-3-pro-preview` selections to `google/gemini-3.1-pro-preview` before they are written to model config.
+- Amazon Bedrock: support `serviceTier` parameter for Bedrock models, configurable via `agents.defaults.params.serviceTier` or per-model in `agents.defaults.models`. Valid values: `default`, `flex`, `priority`, `reserved`. (#64512) Thanks @mobilinkd.
 - Control UI: read the Quick Settings exec policy badge from `tools.exec.security` instead of the non-schema `agents.defaults.exec.security` path, so configured `full`/`deny` values render accurately. Fixes #78311. Thanks @FriedBack.
 - Control UI/usage: add transcript-backed historical lineage rollups for rotated logical sessions, with current-instance vs historical-lineage scope controls and long-range presets so usage history stays visible after restarts and updates. Fixes #50701. Thanks @dev-gideon-llc and @BunsDev.
 - Agents/failover: harden state-aware lane suspension by persisting quota resume transitions, restoring configured lane concurrency, preserving non-quota failure reasons, and exporting model failover events through diagnostics OTLP. Thanks @BunsDev.
diff --git a/docs/providers/bedrock.md b/docs/providers/bedrock.md
index 7f2f6b8f0cc..6257e0c05fd 100644
--- a/docs/providers/bedrock.md
+++ b/docs/providers/bedrock.md
@@ -256,6 +256,49 @@ openclaw models list
 
   </Accordion>
 
+  <Accordion title="Service tier">
+    Some Bedrock models support a `service_tier` parameter to optimize for cost
+    or latency. The following tiers are available:
+
+    | Tier | Description |
+    |------|-------------|
+    | `default` | Standard Bedrock tier |
+    | `flex` | Discounted processing for workloads that can tolerate longer latency |
+    | `priority` | Prioritized processing for latency-sensitive workloads |
+    | `reserved` | Reserved capacity for steady-state workloads |
+
+    Set `serviceTier` (or `service_tier`) via `agents.defaults.params` for
+    Bedrock model requests, or per-model in
+    `agents.defaults.models["<model-key>"].params`:
+
+    ```json5
+    {
+      agents: {
+        defaults: {
+          params: {
+            serviceTier: "flex", // applies to all models
+          },
+          models: {
+            "amazon-bedrock/mistral.mistral-large-3-675b-instruct": {
+              params: {
+                serviceTier: "priority", // per-model override
+              },
+            },
+          },
+        },
+      },
+    }
+    ```
+
+    Valid values are `default`, `flex`, `priority`, and `reserved`. Not all
+    models support all tiers — if an unsupported tier is requested, Bedrock will
+    return a validation error. Note: the error message is somewhat misleading;
+    it may say "The provided model identifier is invalid" rather than indicating
+    an unsupported service tier. If you see this error, check whether the model
+    supports the requested tier.
+
+  </Accordion>
+
   <Accordion title="Claude Opus 4.7 temperature">
     Bedrock rejects the `temperature` parameter for Claude Opus 4.7. OpenClaw
     omits `temperature` automatically for any Opus 4.7 Bedrock ref, including
diff --git a/extensions/amazon-bedrock/index.test.ts b/extensions/amazon-bedrock/index.test.ts
index 4e8666bbb54..240b78a09b9 100644
--- a/extensions/amazon-bedrock/index.test.ts
+++ b/extensions/amazon-bedrock/index.test.ts
@@ -160,34 +160,28 @@ function makeAppInferenceProfileDescriptor(modelId: string): never {
   } as never;
 }
 
-/**
- * Call wrapStreamFn and then invoke the returned stream function, capturing
- * the payload via the onPayload hook that streamWithPayloadPatch installs.
- */
 async function callWrappedStream(
   provider: RegisteredProviderPlugin,
   modelId: string,
   modelDescriptor: never,
   config?: OpenClawConfig,
+  extraParams?: Record<string, unknown>,
+  payload: Record<string, unknown> = {},
 ): Promise<Record<string, unknown>> {
   const wrapped = provider.wrapStreamFn?.({
     provider: "amazon-bedrock",
     modelId,
     config,
     streamFn: spyStreamFn,
+    ...(extraParams ? { extraParams } : {}),
   } as never);
 
-  // The wrapped stream returns the options object (from spyStreamFn).
-  // For guardrail-wrapped streams, streamWithPayloadPatch intercepts onPayload,
-  // so we need to invoke onPayload on the returned options to trigger the patch.
   const result = wrapped?.(modelDescriptor, { messages: [] } as never, {}) as unknown as Record<
     string,
     unknown
   >;
 
-  // If onPayload was installed by streamWithPayloadPatch, call it to apply the patch.
   if (typeof result?.onPayload === "function") {
-    const payload: Record<string, unknown> = {};
     await (result.onPayload as (p: Record<string, unknown>, model: unknown) => Promise<unknown>)(
       payload,
       modelDescriptor,
@@ -719,6 +713,89 @@ describe("amazon-bedrock provider plugin", () => {
     });
   });
 
+  describe("service tier", () => {
+    const CONVERSE_MODEL_DESCRIPTOR = {
+      api: "bedrock-converse-stream",
+      provider: "amazon-bedrock",
+      id: NON_ANTHROPIC_MODEL,
+    } as never;
+
+    it("injects serviceTier for valid camelCase value ('flex')", async () => {
+      const provider = await registerWithConfig(undefined);
+      const result = await callWrappedStream(
+        provider,
+        NON_ANTHROPIC_MODEL,
+        CONVERSE_MODEL_DESCRIPTOR,
+        runtimePluginConfig(undefined),
+        { serviceTier: "flex" },
+      );
+      expect(result._capturedPayload).toMatchObject({ serviceTier: { type: "flex" } });
+    });
+
+    it("injects serviceTier for valid snake_case value ('priority')", async () => {
+      const provider = await registerWithConfig(undefined);
+      const result = await callWrappedStream(
+        provider,
+        NON_ANTHROPIC_MODEL,
+        CONVERSE_MODEL_DESCRIPTOR,
+        runtimePluginConfig(undefined),
+        { service_tier: "priority" },
+      );
+      expect(result._capturedPayload).toMatchObject({ serviceTier: { type: "priority" } });
+    });
+
+    it("injects serviceTier for all valid tier names", async () => {
+      const provider = await registerWithConfig(undefined);
+      for (const tier of ["flex", "priority", "default", "reserved"] as const) {
+        const result = await callWrappedStream(
+          provider,
+          NON_ANTHROPIC_MODEL,
+          CONVERSE_MODEL_DESCRIPTOR,
+          runtimePluginConfig(undefined),
+          { serviceTier: tier },
+        );
+        expect(result._capturedPayload).toMatchObject({ serviceTier: { type: tier } });
+      }
+    });
+
+    it("does not inject serviceTier when value is invalid", async () => {
+      const provider = await registerWithConfig(undefined);
+      const result = await callWrappedStream(
+        provider,
+        NON_ANTHROPIC_MODEL,
+        CONVERSE_MODEL_DESCRIPTOR,
+        runtimePluginConfig(undefined),
+        { serviceTier: "not-a-tier" },
+      );
+      expect(result).not.toHaveProperty("_capturedPayload");
+    });
+
+    it("does not overwrite caller-provided serviceTier in payload", async () => {
+      const provider = await registerWithConfig(undefined);
+      const result = await callWrappedStream(
+        provider,
+        NON_ANTHROPIC_MODEL,
+        CONVERSE_MODEL_DESCRIPTOR,
+        runtimePluginConfig(undefined),
+        { serviceTier: "flex" },
+        { serviceTier: { type: "priority" } },
+      );
+      expect(result._capturedPayload).toMatchObject({ serviceTier: { type: "priority" } });
+    });
+
+    it("skips injection for non-converse API models", async () => {
+      const provider = await registerWithConfig(undefined);
+      const result = await callWrappedStream(
+        provider,
+        NON_ANTHROPIC_MODEL,
+        { api: "openai-completions", provider: "amazon-bedrock", id: NON_ANTHROPIC_MODEL } as never,
+        runtimePluginConfig(undefined),
+        { serviceTier: "flex" },
+      );
+      expect(result).not.toHaveProperty("_capturedPayload");
+    });
+  });
+
   describe("application inference profile cache point injection", () => {
     /**
      * Invoke wrapStreamFn with a payload containing system/messages, then
diff --git a/extensions/amazon-bedrock/register.sync.runtime.ts b/extensions/amazon-bedrock/register.sync.runtime.ts
index abef50b3578..01740101e44 100644
--- a/extensions/amazon-bedrock/register.sync.runtime.ts
+++ b/extensions/amazon-bedrock/register.sync.runtime.ts
@@ -34,6 +34,43 @@ type AmazonBedrockPluginConfig = {
   guardrail?: GuardrailConfig;
 };
 
+const BEDROCK_SERVICE_TIER_VALUES = ["flex", "priority", "default", "reserved"] as const;
+type BedrockServiceTier = (typeof BEDROCK_SERVICE_TIER_VALUES)[number];
+
+function isBedrockServiceTier(value: string): value is BedrockServiceTier {
+  return BEDROCK_SERVICE_TIER_VALUES.some((tier) => tier === value);
+}
+
+function resolveBedrockServiceTier(
+  extraParams: Record<string, unknown> | undefined,
+  warn: (message: string) => void,
+): BedrockServiceTier | undefined {
+  const raw = extraParams?.serviceTier ?? extraParams?.service_tier;
+  if (typeof raw !== "string") {
+    return undefined;
+  }
+  const normalized = raw.trim().toLowerCase();
+  if (isBedrockServiceTier(normalized)) {
+    return normalized;
+  }
+  warn(`ignoring invalid Bedrock service_tier param: ${raw}`);
+  return undefined;
+}
+
+function createBedrockServiceTierWrapper(
+  underlying: StreamFn,
+  serviceTier: BedrockServiceTier,
+): StreamFn {
+  return (model, context, options) => {
+    if (model.api !== "bedrock-converse-stream") {
+      return underlying(model, context, options);
+    }
+    return streamWithPayloadPatch(underlying, model, context, options, (payloadObj) => {
+      payloadObj.serviceTier ??= { type: serviceTier };
+    });
+  };
+}
+
 function createGuardrailWrapStreamFn(
   innerWrapStreamFn: (ctx: { modelId: string; streamFn?: StreamFn }) => StreamFn | null | undefined,
   guardrailConfig: GuardrailConfig,
@@ -484,13 +521,20 @@ export function registerAmazonBedrockPlugin(api: OpenClawPluginApi): void {
     },
     resolveConfigApiKey: ({ env }) => resolveBedrockConfigApiKey(env),
     ...anthropicByModelReplayHooks,
-    wrapStreamFn: ({ modelId, config, model, streamFn, thinkingLevel }) => {
+    wrapStreamFn: ({ modelId, config, model, streamFn, thinkingLevel, extraParams }) => {
       const currentGuardrail = resolveCurrentPluginConfig(config)?.guardrail;
-      // Apply cache + guardrail wrapping.
-      const wrapped =
-        currentGuardrail?.guardrailIdentifier && currentGuardrail?.guardrailVersion
+      let wrapped =
+        (currentGuardrail?.guardrailIdentifier && currentGuardrail?.guardrailVersion
           ? createGuardrailWrapStreamFn(baseWrapStreamFn, currentGuardrail)({ modelId, streamFn })
-          : baseWrapStreamFn({ modelId, streamFn });
+          : baseWrapStreamFn({ modelId, streamFn })) ?? undefined;
+
+      const serviceTier = resolveBedrockServiceTier(extraParams, (message) =>
+        api.logger.warn(message),
+      );
+      if (serviceTier && wrapped) {
+        wrapped = createBedrockServiceTierWrapper(wrapped, serviceTier);
+      }
+
       const region = resolveBedrockRegion(config) ?? extractRegionFromBaseUrl(model?.baseUrl);
       const mayNeedCacheInjection =
         isBedrockAppInferenceProfile(modelId) && !piAiWouldInjectCachePoints(modelId);