diff --git a/docs/gateway/troubleshooting.md b/docs/gateway/troubleshooting.md
index 86874820b41..46d2c58b966 100644
--- a/docs/gateway/troubleshooting.md
+++ b/docs/gateway/troubleshooting.md
@@ -29,6 +29,35 @@ Expected healthy signals:
 - `openclaw doctor` reports no blocking config/service issues.
 - `openclaw channels status --probe` shows connected/ready channels.
 
+## Anthropic 429 extra usage required for long context
+
+Use this when logs/errors include:
+`HTTP 429: rate_limit_error: Extra usage is required for long context requests`.
+
+```bash
+openclaw logs --follow
+openclaw models status
+openclaw config get agents.defaults.models
+```
+
+Look for:
+
+- Selected Anthropic Opus/Sonnet model has `params.context1m: true`.
+- Current Anthropic credential is not eligible for long-context usage.
+- Requests fail only on long sessions/model runs that need the 1M beta path.
+
+Fix options:
+
+1. Disable `context1m` for that model to fall back to the normal context window.
+2. Use an Anthropic API key with billing, or enable Anthropic Extra Usage on the subscription account.
+3. Configure fallback models so runs continue when Anthropic long-context requests are rejected.
+
+Related:
+
+- [/providers/anthropic](/providers/anthropic)
+- [/reference/token-use](/reference/token-use)
+- [/help/faq#why-am-i-seeing-http-429-ratelimiterror-from-anthropic](/help/faq#why-am-i-seeing-http-429-ratelimiterror-from-anthropic)
+
 ## No replies
 
 If channels are up but nothing answers, check routing and policy before reconnecting anything.
diff --git a/docs/help/faq.md b/docs/help/faq.md
index 14757d24e09..10009ba1b7a 100644
--- a/docs/help/faq.md
+++ b/docs/help/faq.md
@@ -714,8 +714,15 @@ use a **Claude subscription** (setup-token or Claude Code OAuth), wait for the w
 reset or upgrade your plan. If you use an **Anthropic API key**, check the Anthropic Console
 for usage/billing and raise limits as needed.
 
+If the message is specifically:
+`Extra usage is required for long context requests`, the request is trying to use
+Anthropic's 1M context beta (`context1m: true`). That only works when your
+credential is eligible for long-context billing (API key billing or subscription
+with Extra Usage enabled).
+
 Tip: set a **fallback model** so OpenClaw can keep replying while a provider is rate-limited.
-See [Models](/cli/models) and [OAuth](/concepts/oauth).
+See [Models](/cli/models), [OAuth](/concepts/oauth), and
+[/gateway/troubleshooting#anthropic-429-extra-usage-required-for-long-context](/gateway/troubleshooting#anthropic-429-extra-usage-required-for-long-context).
 
 ### Is AWS Bedrock supported
 
diff --git a/docs/help/troubleshooting.md b/docs/help/troubleshooting.md
index c4754da1867..4b6e93afe3c 100644
--- a/docs/help/troubleshooting.md
+++ b/docs/help/troubleshooting.md
@@ -34,6 +34,12 @@ Good output in one line:
 - `openclaw channels status --probe` → channels report `connected` or `ready`.
 - `openclaw logs --follow` → steady activity, no repeating fatal errors.
 
+## Anthropic long context 429
+
+If you see:
+`HTTP 429: rate_limit_error: Extra usage is required for long context requests`,
+go to [/gateway/troubleshooting#anthropic-429-extra-usage-required-for-long-context](/gateway/troubleshooting#anthropic-429-extra-usage-required-for-long-context).
+
 ## Decision tree
 
 ```mermaid
diff --git a/docs/providers/anthropic.md b/docs/providers/anthropic.md
index 40f86630dba..69a0025d2f5 100644
--- a/docs/providers/anthropic.md
+++ b/docs/providers/anthropic.md
@@ -137,6 +137,14 @@ with `params.context1m: true` for supported Opus/Sonnet models.
 OpenClaw maps this to `anthropic-beta: context-1m-2025-08-07` on Anthropic
 requests.
 
+This only activates when `params.context1m` is explicitly set to `true` for
+that model.
+
+Requirement: Anthropic must allow long-context usage on that credential
+(typically API key billing, or a subscription account with Extra Usage
+enabled). Otherwise Anthropic returns:
+`HTTP 429: rate_limit_error: Extra usage is required for long context requests`.
+
 Note: Anthropic currently rejects `context-1m-*` beta requests when using
 OAuth/subscription tokens (`sk-ant-oat-*`). OpenClaw automatically skips the
 context1m beta header for OAuth auth and keeps the required OAuth betas.
diff --git a/docs/reference/token-use.md b/docs/reference/token-use.md
index 9127e2477e0..9e85c25e687 100644
--- a/docs/reference/token-use.md
+++ b/docs/reference/token-use.md
@@ -154,6 +154,12 @@ agents:
 
 This maps to Anthropic's `context-1m-2025-08-07` beta header.
 
+This only applies when `context1m: true` is set on that model entry.
+
+Requirement: the credential must be eligible for long-context usage (API key
+billing, or subscription with Extra Usage enabled). If not, Anthropic responds
+with `HTTP 429: rate_limit_error: Extra usage is required for long context requests`.
+
 If you authenticate Anthropic with OAuth/subscription tokens (`sk-ant-oat-*`),
 OpenClaw skips the `context-1m-*` beta header because Anthropic currently
 rejects that combination with HTTP 401.
diff --git a/src/agents/context.test.ts b/src/agents/context.test.ts
index 083fc5a8425..267755a8849 100644
--- a/src/agents/context.test.ts
+++ b/src/agents/context.test.ts
@@ -103,6 +103,27 @@ describe("resolveContextTokensForModel", () => {
     expect(result).toBe(ANTHROPIC_CONTEXT_1M_TOKENS);
   });
 
+  it("does not force 1M context when context1m is not enabled", () => {
+    const result = resolveContextTokensForModel({
+      cfg: {
+        agents: {
+          defaults: {
+            models: {
+              "anthropic/claude-opus-4-6": {
+                params: {},
+              },
+            },
+          },
+        },
+      },
+      provider: "anthropic",
+      model: "claude-opus-4-6",
+      fallbackContextTokens: 200_000,
+    });
+
+    expect(result).toBe(200_000);
+  });
+
   it("does not force 1M context for non-opus/sonnet Anthropic models", () => {
     const result = resolveContextTokensForModel({
       cfg: {
diff --git a/src/agents/pi-embedded-runner-extraparams.test.ts b/src/agents/pi-embedded-runner-extraparams.test.ts
index 8689315658e..5f45ebe7caa 100644
--- a/src/agents/pi-embedded-runner-extraparams.test.ts
+++ b/src/agents/pi-embedded-runner-extraparams.test.ts
@@ -763,6 +763,19 @@ describe("applyExtraParamsToAgent", () => {
     });
   });
 
+  it("does not add Anthropic 1M beta header when context1m is not enabled", () => {
+    const cfg = buildAnthropicModelConfig("anthropic/claude-opus-4-6", {
+      temperature: 0.2,
+    });
+    const headers = runAnthropicHeaderCase({
+      cfg,
+      modelId: "claude-opus-4-6",
+      options: { headers: { "X-Custom": "1" } },
+    });
+
+    expect(headers).toEqual({ "X-Custom": "1" });
+  });
+
   it("skips context1m beta for OAuth tokens but preserves OAuth-required betas", () => {
     const calls: Array<SimpleStreamOptions | undefined> = [];
     const baseStreamFn: StreamFn = (_model, _context, options) => {