diff --git a/src/app/api/openrouter/[...path]/route.ts b/src/app/api/openrouter/[...path]/route.ts
index 65fe3044ea..c9cc895d55 100644
--- a/src/app/api/openrouter/[...path]/route.ts
+++ b/src/app/api/openrouter/[...path]/route.ts
@@ -53,7 +53,7 @@ import { KILO_AUTO_MODEL_ID } from '@/lib/kilo-auto-model';
 
 const MAX_TOKENS_LIMIT = 99999999999; // GPT4.1 default is ~32k
 
-const OPUS = 'anthropic/claude-opus-4.5';
+const OPUS = 'anthropic/claude-opus-4.6';
 const SONNET = 'anthropic/claude-sonnet-4.5';
 
 // Mode → model mappings for kilo/auto routing.
diff --git a/src/lib/models.ts b/src/lib/models.ts
index 4a42944609..dad2f41429 100644
--- a/src/lib/models.ts
+++ b/src/lib/models.ts
@@ -13,7 +13,7 @@ import { recommendedModels } from '@/lib/providers/recommended-models';
 import { kat_coder_pro_free_model } from '@/lib/providers/streamlake';
 import { zai_glm47_free_model } from '@/lib/providers/zai';
 
-export const DEFAULT_MODEL_CHOICES = ['anthropic/claude-sonnet-4.5', 'anthropic/claude-opus-4.5'];
+export const DEFAULT_MODEL_CHOICES = ['anthropic/claude-sonnet-4.5', 'anthropic/claude-opus-4.6'];
 
 export const PRIMARY_DEFAULT_MODEL = DEFAULT_MODEL_CHOICES[0];
 
diff --git a/src/lib/providers/anthropic.ts b/src/lib/providers/anthropic.ts
index 8afb949d68..4bffe5a048 100644
--- a/src/lib/providers/anthropic.ts
+++ b/src/lib/providers/anthropic.ts
@@ -4,15 +4,15 @@ import { normalizeToolCallIds } from '@/lib/tool-calling';
 import type OpenAI from 'openai';
 
 export const opus_45_free_slackbot_model = {
-  public_id: 'anthropic/claude-opus-4.5:slackbot',
-  display_name: 'Claude Opus 4.5 (Free for Kilo for Slack)',
-  description: 'Free version of Claude Opus 4.5 for use in Kilo for Slack only',
+  public_id: 'anthropic/claude-opus-4.6:slackbot',
+  display_name: 'Claude Opus 4.6 (Free for Kilo for Slack)',
+  description: 'Free version of Claude Opus 4.6 for use in Kilo for Slack only',
   context_length: 200000,
   max_completion_tokens: 32000,
   is_enabled: true,
   flags: ['reasoning', 'vision'],
   gateway: 'vercel',
-  internal_id: 'anthropic/claude-opus-4.5',
+  internal_id: 'anthropic/claude-opus-4.6',
   inference_providers: ['anthropic'],
   slackbot_only: true,
 } as KiloFreeModel;
diff --git a/src/lib/providers/recommended-models.ts b/src/lib/providers/recommended-models.ts
index d057b8f09a..cd773a7e77 100644
--- a/src/lib/providers/recommended-models.ts
+++ b/src/lib/providers/recommended-models.ts
@@ -44,7 +44,7 @@ export const recommendedModels = [
     random_vercel_routing: true,
   },
   {
-    public_id: 'anthropic/claude-opus-4.5',
+    public_id: 'anthropic/claude-opus-4.6',
     tool_choice_required: false,
     random_vercel_routing: false, // not yet allowed pending strict tool use support
   },
diff --git a/src/lib/security-agent/core/constants.ts b/src/lib/security-agent/core/constants.ts
index 954ef75d76..b4da315383 100644
--- a/src/lib/security-agent/core/constants.ts
+++ b/src/lib/security-agent/core/constants.ts
@@ -12,7 +12,7 @@ import type { SecurityAgentConfig } from './types';
  */
 export const SECURITY_AGENT_MODELS = [
   { id: 'anthropic/claude-sonnet-4.5', name: 'Claude Sonnet 4.5', free: false },
-  { id: 'anthropic/claude-opus-4.5', name: 'Claude Opus 4.5', free: false },
+  { id: 'anthropic/claude-opus-4.6', name: 'Claude Opus 4.6', free: false },
   { id: 'x-ai/grok-code-fast-1', name: 'Grok Code Fast 1 (free)', free: true },
 ] as const;
 
diff --git a/storybook/stories/shared/ModelCombobox.stories.tsx b/storybook/stories/shared/ModelCombobox.stories.tsx
index 356d8325db..df150fc37f 100644
--- a/storybook/stories/shared/ModelCombobox.stories.tsx
+++ b/storybook/stories/shared/ModelCombobox.stories.tsx
@@ -10,7 +10,7 @@ import {
 const sortingDemoModels: ModelOption[] = [
   // Some preferred models (will appear in "Recommended" section)
   { id: 'x-ai/grok-code-fast-1', name: 'Grok Code Fast 1' },
-  { id: 'anthropic/claude-opus-4.5', name: 'Claude Opus 4.5' },
+  { id: 'anthropic/claude-opus-4.6', name: 'Claude Opus 4.6' },
   { id: 'anthropic/claude-sonnet-4.5', name: 'Claude Sonnet 4.5' },
   { id: 'openai/gpt-5.1', name: 'GPT-5.1' },