diff --git a/src/brands/deepseek.ts b/src/brands/deepseek.ts
new file mode 100644
index 0000000..a914cc7
--- /dev/null
+++ b/src/brands/deepseek.ts
@@ -0,0 +1,200 @@
+import type { TweakccConfig, Theme } from './types.js';
+import { DEFAULT_THEMES } from './defaultThemes.js';
+import { buildBrandMiscConfig } from './miscDefaults.js';
+import { buildDiffPalette } from './diffPalette.js';
+import { formatUserMessage, getUserLabel } from './userLabel.js';
+
+type Rgb = { r: number; g: number; b: number };
+
+const clamp = (value: number) => Math.max(0, Math.min(255, Math.round(value)));
+
+const hexToRgb = (hex: string): Rgb => {
+  const normalized = hex.replace('#', '').trim();
+  if (normalized.length === 3) {
+    const [r, g, b] = normalized.split('');
+    return {
+      r: clamp(parseInt(r + r, 16)),
+      g: clamp(parseInt(g + g, 16)),
+      b: clamp(parseInt(b + b, 16)),
+    };
+  }
+  if (normalized.length !== 6) {
+    throw new Error(`Unsupported hex color: ${hex}`);
+  }
+  return {
+    r: clamp(parseInt(normalized.slice(0, 2), 16)),
+    g: clamp(parseInt(normalized.slice(2, 4), 16)),
+    b: clamp(parseInt(normalized.slice(4, 6), 16)),
+  };
+};
+
+const rgb = (hex: string) => {
+  const { r, g, b } = hexToRgb(hex);
+  return `rgb(${r},${g},${b})`;
+};
+
+const mix = (hexA: string, hexB: string, weight: number) => {
+  const a = hexToRgb(hexA);
+  const b = hexToRgb(hexB);
+  const w = Math.max(0, Math.min(1, weight));
+  return `rgb(${clamp(a.r + (b.r - a.r) * w)},${clamp(a.g + (b.g - a.g) * w)},${clamp(a.b + (b.b - a.b) * w)})`;
+};
+
+const lighten = (hex: string, weight: number) => mix(hex, '#ffffff', weight);
+
+type Palette = {
+  base: string;
+  surface: string;
+  panel: string;
+  border: string;
+  borderStrong: string;
+  text: string;
+  textMuted: string;
+  textDim: string;
+  core: string;
+  deep: string;
+  orange: string;
+  yellow: string;
+  cyan: string;
+  blue: string;
+  green: string;
+  red: string;
+};
+
+const DEEPSEEK_CORE = '#4d9de0';
+
+const palette: Palette = {
+  base: '#080c14',
+  surface: '#0e1420',
+  panel: '#141c2c',
+  border: '#1e2e48',
+  borderStrong: '#2a4060',
+  text: '#e8eef8',
+  textMuted: '#b0c0d8',
+  textDim: '#6888a8',
+  core: DEEPSEEK_CORE,
+  deep: '#2563eb',
+  orange: '#f59e0b',
+  yellow: '#fbbf24',
+  cyan: '#06b6d4',
+  blue: '#3b82f6',
+  green: '#10b981',
+  red: '#ef4444',
+};
+
+const makeTheme = (): Theme => {
+  const tint = (hex: string, weight: number) => mix(palette.base, hex, weight);
+  return {
+    name: 'DeepSeek Abyss',
+    id: 'dark',
+    colors: {
+      autoAccept: rgb(palette.green),
+      bashBorder: rgb(palette.core),
+      claude: rgb(palette.core),
+      claudeShimmer: lighten(palette.core, 0.28),
+      claudeBlue_FOR_SYSTEM_SPINNER: rgb(palette.blue),
+      claudeBlueShimmer_FOR_SYSTEM_SPINNER: lighten(palette.blue, 0.3),
+      permission: rgb(palette.orange),
+      permissionShimmer: lighten(palette.orange, 0.25),
+      planMode: rgb(palette.core),
+      ide: rgb(palette.cyan),
+      promptBorder: rgb(palette.border),
+      promptBorderShimmer: rgb(palette.borderStrong),
+      text: rgb(palette.text),
+      inverseText: rgb(palette.base),
+      inactive: rgb(palette.textDim),
+      subtle: tint(palette.core, 0.18),
+      suggestion: rgb(palette.deep),
+      remember: rgb(palette.core),
+      background: rgb(palette.base),
+      success: rgb(palette.green),
+      error: rgb(palette.red),
+      warning: rgb(palette.yellow),
+      warningShimmer: lighten(palette.yellow, 0.2),
+      ...buildDiffPalette(),
+      red_FOR_SUBAGENTS_ONLY: rgb(palette.red),
+      blue_FOR_SUBAGENTS_ONLY: rgb(palette.blue),
+      green_FOR_SUBAGENTS_ONLY: rgb(palette.green),
+      yellow_FOR_SUBAGENTS_ONLY: rgb(palette.yellow),
+      purple_FOR_SUBAGENTS_ONLY: rgb(palette.deep),
+      orange_FOR_SUBAGENTS_ONLY: rgb(palette.orange),
+      pink_FOR_SUBAGENTS_ONLY: rgb(palette.core),
+      cyan_FOR_SUBAGENTS_ONLY: rgb(palette.cyan),
+      professionalBlue: rgb(palette.blue),
+      rainbow_red: rgb(palette.red),
+      rainbow_orange: rgb(palette.orange),
+      rainbow_yellow: rgb(palette.yellow),
+      rainbow_green: rgb(palette.green),
+      rainbow_blue: rgb(palette.cyan),
+      rainbow_indigo: rgb(palette.blue),
+      rainbow_violet: rgb(palette.core),
+      rainbow_red_shimmer: lighten(palette.red, 0.35),
+      rainbow_orange_shimmer: lighten(palette.orange, 0.35),
+      rainbow_yellow_shimmer: lighten(palette.yellow, 0.25),
+      rainbow_green_shimmer: lighten(palette.green, 0.35),
+      rainbow_blue_shimmer: lighten(palette.cyan, 0.35),
+      rainbow_indigo_shimmer: lighten(palette.blue, 0.35),
+      rainbow_violet_shimmer: lighten(palette.core, 0.35),
+      clawd_body: rgb(palette.core),
+      clawd_background: rgb(palette.base),
+      userMessageBackground: mix('#383838', palette.core, 0.12),
+      bashMessageBackgroundColor: mix('#404040', palette.core, 0.08),
+      memoryBackgroundColor: mix('#383838', palette.cyan, 0.1),
+      rate_limit_fill: rgb(palette.core),
+      rate_limit_empty: rgb(palette.borderStrong),
+    },
+  };
+};
+
+const abyssTheme = makeTheme();
+
+export const buildDeepSeekTweakccConfig = (): TweakccConfig => ({
+  ccVersion: '',
+  ccInstallationPath: null,
+  lastModified: new Date().toISOString(),
+  changesApplied: false,
+  hidePiebaldAnnouncement: true,
+  settings: {
+    themes: [abyssTheme, ...DEFAULT_THEMES.filter((t) => t.id !== abyssTheme.id)],
+    thinkingVerbs: {
+      format: '{}... ',
+      verbs: [
+        'Diving',
+        'Surfacing',
+        'Probing',
+        'Seeking',
+        'Fathoming',
+        'Sounding',
+        'Dredging',
+        'Plumbing',
+        'Trawling',
+        'Charting',
+        'Scanning',
+        'Tracing',
+        'Mapping',
+        'Resolving',
+      ],
+    },
+    thinkingStyle: {
+      updateInterval: 80,
+      phases: ['~', '≈', '~', '≋', '~', '≈'],
+      reverseMirror: false,
+    },
+    userMessageDisplay: {
+      format: formatUserMessage(getUserLabel()),
+      styling: ['bold'],
+      foregroundColor: 'default',
+      backgroundColor: 'default',
+      borderStyle: 'topBottomDouble',
+      borderColor: rgb(palette.core),
+      paddingX: 1,
+      paddingY: 0,
+      fitBoxToContent: true,
+    },
+    inputBox: {
+      removeBorder: true,
+    },
+    misc: buildBrandMiscConfig(),
+    claudeMdAltNames: null,
+  },
+});
diff --git a/src/brands/index.ts b/src/brands/index.ts
index 13e304b..a178b32 100644
--- a/src/brands/index.ts
+++ b/src/brands/index.ts
@@ -9,6 +9,7 @@ import { buildOllamaTweakccConfig } from './ollama.js';
 import { buildGatewayzTweakccConfig } from './gatewayz.js';
 import { buildVercelTweakccConfig } from './vercel.js';
 import { buildNanoGPTTweakccConfig } from './nanogpt.js';
+import { buildDeepSeekTweakccConfig } from './deepseek.js';
 
 export interface BrandPreset {
   key: string;
@@ -30,6 +31,12 @@ const BRAND_PRESETS: Record<string, BrandPreset> = {
     description: 'Electric violet + neon cyberpunk palette',
     buildTweakccConfig: buildMinimaxTweakccConfig,
   },
+  deepseek: {
+    key: 'deepseek',
+    label: 'DeepSeek Abyss',
+    description: 'Deep ocean blue palette with teal accents',
+    buildTweakccConfig: buildDeepSeekTweakccConfig,
+  },
   kimi: {
     key: 'kimi',
     label: 'Kimi Teal',
diff --git a/src/providers/index.ts b/src/providers/index.ts
index e34026e..65f737a 100644
--- a/src/providers/index.ts
+++ b/src/providers/index.ts
@@ -43,6 +43,7 @@ export const PROVIDER_DISPLAY_ORDER = [
   'kimi',
   'minimax',
   'zai',
+  'deepseek',
   'openrouter',
   'vercel',
   'ollama',
@@ -124,6 +125,25 @@ const PROVIDERS: Record<string, ProviderTemplate> = {
     },
     apiKeyLabel: 'Kimi API key',
   },
+  deepseek: {
+    key: 'deepseek',
+    label: 'DeepSeek',
+    description: 'DeepSeek-V3.2 via DeepSeek Anthropic API',
+    baseUrl: 'https://api.deepseek.com/anthropic',
+    env: {
+      API_TIMEOUT_MS: '600000',
+      CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: 1,
+      ANTHROPIC_MODEL: 'deepseek-chat',
+      ANTHROPIC_SMALL_FAST_MODEL: 'deepseek-chat',
+      ANTHROPIC_DEFAULT_SONNET_MODEL: 'deepseek-chat',
+      ANTHROPIC_DEFAULT_OPUS_MODEL: 'deepseek-reasoner',
+      ANTHROPIC_DEFAULT_HAIKU_MODEL: 'deepseek-chat',
+      CC_MIRROR_SPLASH: 1,
+      CC_MIRROR_PROVIDER_LABEL: 'DeepSeek',
+      CC_MIRROR_SPLASH_STYLE: 'deepseek',
+    },
+    apiKeyLabel: 'DeepSeek API key',
+  },
   openrouter: {
     key: 'openrouter',
     label: 'OpenRouter',
diff --git a/src/tui/content/providers.ts b/src/tui/content/providers.ts
index 2332bd1..eaf8775 100644
--- a/src/tui/content/providers.ts
+++ b/src/tui/content/providers.ts
@@ -104,6 +104,32 @@ export const PROVIDER_EDUCATION: Record<string, ProviderEducation> = {
       'Subscribe to Kimi Code, create an API key in the console, and set ANTHROPIC_BASE_URL to https://api.kimi.com/coding/.',
   },
 
+  deepseek: {
+    headline: 'DeepSeek — Deep Seek, Deep Think',
+    tagline: 'Ocean depths, sharp reasoning',
+    features: [
+      'Official Anthropic-compatible API endpoint',
+      'deepseek-reasoner for Opus (reasoning mode)',
+      'deepseek-chat for Sonnet/Haiku (fast mode)',
+      'DeepSeek-V3.2 under the hood',
+      'Ocean blue-themed interface',
+    ],
+    bestFor: 'Cost-effective reasoning and coding with DeepSeek V3.2',
+    models: {
+      opus: 'deepseek-reasoner',
+      sonnet: 'deepseek-chat',
+      haiku: 'deepseek-chat',
+    },
+    requiresMapping: false,
+    hasPromptPack: false,
+    setupLinks: {
+      subscribe: 'https://platform.deepseek.com',
+      apiKey: 'https://platform.deepseek.com/api_keys',
+      docs: 'https://api-docs.deepseek.com/guides/anthropic_api',
+    },
+    setupNote: 'Create an account at platform.deepseek.com, top up credits, then generate an API key.',
+  },
+
   openrouter: {
     headline: 'OpenRouter — One API, Any Model',
     tagline: 'Many paths, one door',
@@ -257,6 +283,7 @@ export const PROVIDER_COMPARISON = {
     'kimi',
     'minimax',
     'zai',
+    'deepseek',
     'openrouter',
     'vercel',
     'ollama',
diff --git a/src/tui/screens/ModelConfigScreen.tsx b/src/tui/screens/ModelConfigScreen.tsx
index aadded5..22f4c3b 100644
--- a/src/tui/screens/ModelConfigScreen.tsx
+++ b/src/tui/screens/ModelConfigScreen.tsx
@@ -67,6 +67,11 @@ function getPlaceholder(providerKey: string | undefined, model: 'opus' | 'sonnet
       sonnet: 'MiniMax-M2.5',
       haiku: 'MiniMax-M2.5',
     },
+    deepseek: {
+      opus: 'deepseek-reasoner',
+      sonnet: 'deepseek-chat',
+      haiku: 'deepseek-chat',
+    },
     openrouter: {
       opus: 'anthropic/claude-3-opus',
       sonnet: 'anthropic/claude-3.5-sonnet',