diff --git a/src/ai-providers/model-semantics.ts b/src/ai-providers/model-semantics.ts
index bdfc2991c..34334e35a 100644
--- a/src/ai-providers/model-semantics.ts
+++ b/src/ai-providers/model-semantics.ts
@@ -317,6 +317,18 @@ export const MODEL_SEMANTICS_BY_VENDOR: Registry = {
       },
     },
   },
+  'atlas-cloud': {
+    'deepseek-ai/deepseek-v4-pro': {
+      contextWindow: 1_000_000,
+      maxOutputTokens: 384_000,
+      reasoning: {
+        mode: 'optional',
+        efforts: ['high', 'max'],
+        defaultEffort: 'high',
+        interleaved: true,
+      },
+    },
+  },
   longcat: {
     'LongCat-2.0': {
       maxOutputTokens: 131_072,
diff --git a/src/ai-providers/preset-catalog.spec.ts b/src/ai-providers/preset-catalog.spec.ts
index 8a7cec647..ce8c94976 100644
--- a/src/ai-providers/preset-catalog.spec.ts
+++ b/src/ai-providers/preset-catalog.spec.ts
@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest';
 
 import {
+  ATLAS_CLOUD,
   CLAUDE_API,
   CLAUDE_OAUTH,
   CODEX_API,
@@ -28,6 +29,21 @@ describe('LONGCAT preset', () => {
   });
 });
 
+describe('ATLAS_CLOUD preset', () => {
+  it('uses the versioned OpenAI-compatible endpoint and nested model id', () => {
+    expect(ATLAS_CLOUD.regions?.[0]?.wires['openai-chat']).toBe('https://api.atlascloud.ai/v1');
+    const parsed = ATLAS_CLOUD.zodSchema.parse({
+      backend: 'vercel-ai-sdk',
+      provider: 'openai-compatible',
+      apiKey: 'test-key',
+    }) as { baseUrl?: string; model?: string };
+    expect(parsed).toMatchObject({
+      baseUrl: 'https://api.atlascloud.ai/v1',
+      model: 'deepseek-ai/deepseek-v4-pro',
+    });
+  });
+});
+
 describe('credential form catalog', () => {
   it('uses native Claude Code aliases for subscription profiles', () => {
     expect(CLAUDE_OAUTH.models?.map((model) => model.id)).toEqual([
@@ -160,6 +176,7 @@ describe('credential form catalog', () => {
       kimi: 'kimi-k3',
       deepseek: 'deepseek-v4-pro',
       longcat: 'LongCat-2.0',
+      'atlas-cloud': 'deepseek-ai/deepseek-v4-pro',
       // Runtime-direct provider: `auto` is Cursor routing, not a model API id.
       cursor: 'auto',
     });
@@ -213,6 +230,7 @@ describe('credential form catalog', () => {
       kimi: 'kimi',
       deepseek: 'deepseek',
       longcat: 'longcat',
+      'atlas-cloud': 'atlas-cloud',
     };
 
     for (const [presetId, vendor] of Object.entries(vendorByPreset)) {
diff --git a/src/ai-providers/preset-catalog.ts b/src/ai-providers/preset-catalog.ts
index 1ca395090..a8feb4ef5 100644
--- a/src/ai-providers/preset-catalog.ts
+++ b/src/ai-providers/preset-catalog.ts
@@ -490,6 +490,38 @@ export const LONGCAT: PresetDef = {
   writeOnlyFields: ['apiKey'],
 }
 
+// ==================== Third-party: Atlas Cloud ====================
+
+export const ATLAS_CLOUD: PresetDef = {
+  id: 'atlas-cloud',
+  label: 'Atlas Cloud',
+  description: 'Atlas Cloud models via its OpenAI-compatible API',
+  category: 'third-party',
+  defaultName: 'Atlas Cloud',
+  hint: 'Uses Atlas Cloud\'s OpenAI-compatible Chat Completions endpoint. This credential can drive OpenCode and Pi.',
+  zodSchema: z.object({
+    backend: z.literal('vercel-ai-sdk'),
+    provider: z.literal('openai-compatible'),
+    baseUrl: z.string().default('https://api.atlascloud.ai/v1').describe('API endpoint'),
+    model: z.string().default('deepseek-ai/deepseek-v4-pro').describe('Model'),
+    apiKey: z.string().min(1).describe('Atlas Cloud API key'),
+  }),
+  regions: [{
+    id: 'default',
+    label: 'Atlas Cloud (api.atlascloud.ai)',
+    wires: { 'openai-chat': 'https://api.atlascloud.ai/v1' },
+  }],
+  models: withModelSemantics('atlas-cloud', [
+    { id: 'deepseek-ai/deepseek-v4-pro', label: 'DeepSeek V4 Pro' },
+  ]),
+  setup: {
+    apiKeyLabel: 'Atlas Cloud API key',
+    apiKeyHelp: 'Use an API key from the Atlas Cloud console.',
+    modelHelp: 'Choose a model available to the key, or paste another exact Atlas Cloud model ID.',
+  },
+  writeOnlyFields: ['apiKey'],
+}
+
 // ==================== Runtime-direct: Cursor ====================
 
 export const CURSOR_DASHBOARD: PresetDef = {
@@ -560,6 +592,7 @@ export const PRESET_CATALOG: PresetDef[] = [
   KIMI,
   DEEPSEEK,
   LONGCAT,
+  ATLAS_CLOUD,
   GEMINI,
   CURSOR_DASHBOARD,
   CUSTOM,
@@ -584,5 +617,6 @@ export const DEFAULT_MODEL_BY_VENDOR: Record<string, string> = {
   kimi: 'kimi-k3',
   deepseek: 'deepseek-v4-pro',
   longcat: 'LongCat-2.0',
+  'atlas-cloud': 'deepseek-ai/deepseek-v4-pro',
   cursor: 'auto',
 }