diff --git a/.env.example b/.env.example
index 2eec4b42..f883865e 100644
--- a/.env.example
+++ b/.env.example
@@ -1,12 +1,15 @@
 # ============================================================
 # MiniMax（直连 Anthropic 兼容接口）
+# 海外用户: ANTHROPIC_BASE_URL=https://api.minimax.io/anthropic
+# 国内用户: ANTHROPIC_BASE_URL=https://api.minimaxi.com/anthropic
+# 可用模型: MiniMax-M2.7（默认）、MiniMax-M2.7-highspeed（更快）
 # ============================================================
-# ANTHROPIC_AUTH_TOKEN=your_token_here
-# ANTHROPIC_BASE_URL=https://api.minimaxi.com/anthropic
-# ANTHROPIC_MODEL=MiniMax-M2.7-highspeed
-# ANTHROPIC_DEFAULT_SONNET_MODEL=MiniMax-M2.7-highspeed
+# ANTHROPIC_AUTH_TOKEN=your_minimax_api_key_here
+# ANTHROPIC_BASE_URL=https://api.minimax.io/anthropic
+# ANTHROPIC_MODEL=MiniMax-M2.7
+# ANTHROPIC_DEFAULT_SONNET_MODEL=MiniMax-M2.7
 # ANTHROPIC_DEFAULT_HAIKU_MODEL=MiniMax-M2.7-highspeed
-# ANTHROPIC_DEFAULT_OPUS_MODEL=MiniMax-M2.7-highspeed
+# ANTHROPIC_DEFAULT_OPUS_MODEL=MiniMax-M2.7
 # API_TIMEOUT_MS=3000000
 
 # ============================================================
diff --git a/docs/en/guide/third-party-models.md b/docs/en/guide/third-party-models.md
index 66416c50..7cb3b3fb 100644
--- a/docs/en/guide/third-party-models.md
+++ b/docs/en/guide/third-party-models.md
@@ -172,18 +172,28 @@ CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1
 
 ### MiniMax (pre-configured in .env.example)
 
+MiniMax provides an Anthropic-compatible API endpoint and can be connected directly without any proxy. Available models:
+
+| Model | Description |
+|-------|-------------|
+| `MiniMax-M2.7` | Default recommended, excellent overall performance |
+| `MiniMax-M2.7-highspeed` | Faster responses, suitable for latency-sensitive use cases |
+
 ```env
-ANTHROPIC_AUTH_TOKEN=your_token_here
-ANTHROPIC_BASE_URL=https://api.minimaxi.com/anthropic
-ANTHROPIC_MODEL=MiniMax-M2.7-highspeed
-ANTHROPIC_DEFAULT_SONNET_MODEL=MiniMax-M2.7-highspeed
+ANTHROPIC_AUTH_TOKEN=your_minimax_api_key_here
+# International users: api.minimax.io; China users may use api.minimaxi.com
+ANTHROPIC_BASE_URL=https://api.minimax.io/anthropic
+ANTHROPIC_MODEL=MiniMax-M2.7
+ANTHROPIC_DEFAULT_SONNET_MODEL=MiniMax-M2.7
 ANTHROPIC_DEFAULT_HAIKU_MODEL=MiniMax-M2.7-highspeed
-ANTHROPIC_DEFAULT_OPUS_MODEL=MiniMax-M2.7-highspeed
+ANTHROPIC_DEFAULT_OPUS_MODEL=MiniMax-M2.7
 API_TIMEOUT_MS=3000000
 DISABLE_TELEMETRY=1
 CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1
 ```
 
+> **Get API Key**: Visit [MiniMax Open Platform](https://platform.minimax.io) to register and obtain an API key.
+
 ---
 
 ## Option 3: Other Proxy Tools
diff --git a/docs/guide/third-party-models.md b/docs/guide/third-party-models.md
index 1bc746a6..93b6ccdc 100644
--- a/docs/guide/third-party-models.md
+++ b/docs/guide/third-party-models.md
@@ -172,18 +172,28 @@ CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1
 
 ### MiniMax（已在 .env.example 中配置）
 
+MiniMax 提供 Anthropic 兼容接口，支持直接接入，无需代理。可用模型：
+
+| 模型 | 说明 |
+|------|------|
+| `MiniMax-M2.7` | 默认推荐，综合性能优秀 |
+| `MiniMax-M2.7-highspeed` | 响应更快，适合对速度有要求的场景 |
+
 ```env
-ANTHROPIC_AUTH_TOKEN=your_token_here
-ANTHROPIC_BASE_URL=https://api.minimaxi.com/anthropic
-ANTHROPIC_MODEL=MiniMax-M2.7-highspeed
-ANTHROPIC_DEFAULT_SONNET_MODEL=MiniMax-M2.7-highspeed
+ANTHROPIC_AUTH_TOKEN=your_minimax_api_key_here
+# 海外用户使用 api.minimax.io，国内用户可改为 api.minimaxi.com
+ANTHROPIC_BASE_URL=https://api.minimax.io/anthropic
+ANTHROPIC_MODEL=MiniMax-M2.7
+ANTHROPIC_DEFAULT_SONNET_MODEL=MiniMax-M2.7
 ANTHROPIC_DEFAULT_HAIKU_MODEL=MiniMax-M2.7-highspeed
-ANTHROPIC_DEFAULT_OPUS_MODEL=MiniMax-M2.7-highspeed
+ANTHROPIC_DEFAULT_OPUS_MODEL=MiniMax-M2.7
 API_TIMEOUT_MS=3000000
 DISABLE_TELEMETRY=1
 CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1
 ```
 
+> **获取 API Key**：访问 [MiniMax 开放平台](https://platform.minimax.io) 注册并获取 API Key。
+
 ---
 
 ## 方式三：其他代理工具
diff --git a/src/buddy/companion.ts b/src/buddy/companion.ts
index 09c38386..52f3359f 100644
--- a/src/buddy/companion.ts
+++ b/src/buddy/companion.ts
@@ -7,6 +7,7 @@ import {
   RARITIES,
   RARITY_WEIGHTS,
   type Rarity,
+  type Species,
   SPECIES,
   STAT_NAMES,
   type StatName,
@@ -121,13 +122,35 @@ export function companionUserId(): string {
   return config.oauthAccount?.accountUuid ?? config.userID ?? 'anon'
 }
 
-// Regenerate bones from userId, merge with stored soul. Bones never persist
-// so species renames and SPECIES-array edits can't break stored companions,
-// and editing config.companion can't fake a rarity.
+function storedAppearanceSeed(stored: {
+  appearanceSeed?: string
+  hatchedAt: number
+  name: string
+  personality: string
+}): string {
+  return (
+    stored.appearanceSeed ??
+    `legacy:${stored.hatchedAt}:${stored.name}:${stored.personality}`
+  )
+}
+
+function applyStoredOverrides(
+  bones: CompanionBones,
+  stored: { speciesOverride?: Species },
+): CompanionBones {
+  return stored.speciesOverride
+    ? { ...bones, species: stored.speciesOverride }
+    : bones
+}
+
+// Regenerate bones from the stored hatch seed, merge with the saved soul.
+// Old configs without a seed get a deterministic legacy fallback so they stop
+// changing every render without requiring users to re-hatch.
 export function getCompanion(): Companion | undefined {
   const stored = getGlobalConfig().companion
   if (!stored) return undefined
-  const { bones } = roll(companionUserId())
+  const { bones: rolledBones } = rollWithSeed(storedAppearanceSeed(stored))
+  const bones = applyStoredOverrides(rolledBones, stored)
   // bones last so stale bones fields in old-format configs get overridden
   return { ...stored, ...bones }
 }
diff --git a/src/buddy/types.ts b/src/buddy/types.ts
index 8f1c82aa..8f17b96f 100644
--- a/src/buddy/types.ts
+++ b/src/buddy/types.ts
@@ -118,10 +118,13 @@ export type Companion = CompanionBones &
     hatchedAt: number
   }
 
-// What actually persists in config. Bones are regenerated from hash(userId)
-// on every read so species renames don't break stored companions and users
-// can't edit their way to a legendary.
-export type StoredCompanion = CompanionSoul & { hatchedAt: number }
+// What actually persists in config. The hatch seed locks in a companion's
+// bones so the sprite/species stop changing between renders and restarts.
+export type StoredCompanion = CompanionSoul & {
+  hatchedAt: number
+  appearanceSeed?: string
+  speciesOverride?: Species
+}
 
 export const RARITY_WEIGHTS = {
   common: 60,
diff --git a/src/commands/buddy/buddy.tsx b/src/commands/buddy/buddy.tsx
index 56d7e9c9..235ce6c8 100644
--- a/src/commands/buddy/buddy.tsx
+++ b/src/commands/buddy/buddy.tsx
@@ -4,6 +4,7 @@ import type { LocalJSXCommandCall } from '../../types/command.js'
 import {
   getCompanion,
   roll,
+  rollWithSeed,
   companionUserId,
 } from '../../buddy/companion.js'
 import { renderSprite } from '../../buddy/sprites.js'
@@ -73,8 +74,9 @@ function CompanionCard({
         )
         return
       }
-      // Hatch a new companion with a generated name
-      const { bones } = roll(companionUserId())
+      // Hatch a new companion with a generated name and random seed
+      const appearanceSeed = `hatch:${Date.now()}:${Math.random().toString(36).slice(2)}`
+      const { bones } = rollWithSeed(appearanceSeed)
       const adjectives = [
         'Bright', 'Cozy', 'Swift', 'Calm', 'Wise', 'Bold',
         'Fuzzy', 'Lucky', 'Snappy', 'Quirky',
@@ -90,6 +92,7 @@ function CompanionCard({
         name,
         personality: `A ${bones.rarity} ${bones.species} who loves debugging and hanging out.`,
         hatchedAt: Date.now(),
+        appearanceSeed,
       }
       saveGlobalConfig(c => ({ ...c, companion: soul }))
       onDone(