diff --git a/src/commands/effort/effort.tsx b/src/commands/effort/effort.tsx
index 2804233d04..0791628182 100644
--- a/src/commands/effort/effort.tsx
+++ b/src/commands/effort/effort.tsx
@@ -169,7 +169,7 @@ export async function call(
 
   if (COMMON_HELP_ARGS.includes(args)) {
     onDone(
-      'Usage: /effort [low|medium|high|max|auto]\n\nEffort levels:\n- low: Quick, straightforward implementation\n- medium: Balanced approach with standard testing\n- high: Comprehensive implementation with extensive testing\n- max: Maximum capability with deepest reasoning (Opus 4.6 only)\n- auto: Use the default effort level for your model',
+      'Usage: /effort [low|medium|high|max|auto]\n\nEffort levels:\n- low: Quick, straightforward implementation\n- medium: Balanced approach with standard testing\n- high: Comprehensive implementation with extensive testing\n- max: Maximum capability with deepest reasoning (Opus 4.6/4.7, DeepSeek V4 Pro)\n- auto: Use the default effort level for your model',
     )
     return
   }
diff --git a/src/utils/effort.ts b/src/utils/effort.ts
index 4cf5309957..e4c32d74bd 100644
--- a/src/utils/effort.ts
+++ b/src/utils/effort.ts
@@ -36,7 +36,8 @@ export function modelSupportsEffort(model: string): boolean {
   if (
     m.includes('opus-4-7') ||
     m.includes('opus-4-6') ||
-    m.includes('sonnet-4-6')
+    m.includes('sonnet-4-6') ||
+    m.includes('deepseek-v4-pro')
   ) {
     return true
   }
@@ -57,11 +58,16 @@ export function modelSupportsEffort(model: string): boolean {
 
 // @[MODEL LAUNCH]: Add the new model to the allowlist if it supports 'max' effort.
 // Per API docs, 'max' is Opus 4.6/4.7 only for public models — other models return an error.
+// However, DeepSeek V4 Pro also supports max effort when using Anthropic-compatible API.
 export function modelSupportsMaxEffort(model: string): boolean {
   const supported3P = get3PModelCapabilityOverride(model, 'max_effort')
   if (supported3P !== undefined) {
     return supported3P
   }
+  // Support DeepSeek V4 Pro specifically (Anthropic-compatible API)
+  if (model.toLowerCase().includes('deepseek-v4-pro')) {
+    return true
+  }
   if (
     model.toLowerCase().includes('opus-4-7') ||
     model.toLowerCase().includes('opus-4-6')
@@ -267,7 +273,7 @@ export function getEffortLevelDescription(level: EffortLevel): string {
     case 'xhigh':
       return 'Extended reasoning beyond high, short of max (Opus 4.7 only)'
     case 'max':
-      return 'Maximum capability with deepest reasoning (Opus 4.6/4.7 only)'
+      return 'Maximum capability with deepest reasoning (Opus 4.6/4.7/DeepSeek V4 Pro)'
   }
 }