diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8b585d..2ee94a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Z.AI default model updated from `glm-4.7` to `glm-5.1`
+
 ## [2.3.4] - 2026-03-26
 
 ### Fixed
diff --git a/cmd/default_test.go b/cmd/default_test.go
index 67f0006..f856bff 100644
--- a/cmd/default_test.go
+++ b/cmd/default_test.go
@@ -23,7 +23,7 @@ providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
 `
 	err := os.WriteFile(configPath, []byte(configContent), 0600)
 	if err != nil {
@@ -54,7 +54,7 @@ providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
 `
 	err := os.WriteFile(configPath, []byte(configContent), 0600)
 	if err != nil {
@@ -120,7 +120,7 @@ providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
 `
 	err := os.WriteFile(configPath, []byte(configContent), 0600)
 	if err != nil {
diff --git a/docs/architecture/README.md b/docs/architecture/README.md
index 9324337..93a982f 100644
--- a/docs/architecture/README.md
+++ b/docs/architecture/README.md
@@ -137,12 +137,12 @@ kairo/
 default_provider: zai
 default_harness: claude
 default_models:
-  zai: glm-4.7
+  zai: glm-5.1
 providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
     env_vars:
       - ANTHROPIC_DEFAULT_HAIKU_MODEL=glm-4.7-flash
 ```
@@ -157,7 +157,7 @@ Notes:
 
 | Provider   | Base URL                             | Model             | API Key Required |
 | ---------- | ------------------------------------ | ----------------- | ---------------- |
-| `zai`      | `https://api.z.ai/api/anthropic`     | `glm-4.7`         | Yes              |
+| `zai`      | `https://api.z.ai/api/anthropic`     | `glm-5.1`         | Yes              |
 | `minimax`  | `https://api.minimax.io/anthropic`   | `MiniMax-M2.7`    | Yes              |
 | `deepseek` | `https://api.deepseek.com/anthropic` | `deepseek-chat`   | Yes              |
 | `kimi`     | `https://api.kimi.com/coding/`       | `kimi-for-coding` | Yes              |
diff --git a/docs/guides/user-guide.md b/docs/guides/user-guide.md
index 443f598..3e3491d 100644
--- a/docs/guides/user-guide.md
+++ b/docs/guides/user-guide.md
@@ -79,7 +79,7 @@ kairo -- "Quick question"
 
 | Provider   | Default Model     | API Key Required |
 | ---------- | ----------------- | ---------------- |
-| `zai`      | `glm-4.7`         | Yes              |
+| `zai`      | `glm-5.1`         | Yes              |
 | `minimax`  | `MiniMax-M2.7`    | Yes              |
 | `kimi`     | `kimi-for-coding` | Yes              |
 | `deepseek` | `deepseek-chat`   | Yes              |
diff --git a/docs/reference/configuration.md b/docs/reference/configuration.md
index c136213..3fa5166 100644
--- a/docs/reference/configuration.md
+++ b/docs/reference/configuration.md
@@ -51,13 +51,13 @@ Notes:
 default_provider: zai
 default_harness: claude
 default_models:
-  zai: glm-4.7
+  zai: glm-5.1
   minimax: MiniMax-M2.7
 providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
     env_vars:
       - ANTHROPIC_DEFAULT_HAIKU_MODEL=glm-4.7-flash
   minimax:
@@ -98,7 +98,7 @@ Generated on first setup. The file contains the private identity line followed b
 
 | Provider   | API Key Required | Default Base URL                     | Default Model     |
 | ---------- | ---------------- | ------------------------------------ | ----------------- |
-| `zai`      | Yes              | `https://api.z.ai/api/anthropic`     | `glm-4.7`         |
+| `zai`      | Yes              | `https://api.z.ai/api/anthropic`     | `glm-5.1`         |
 | `minimax`  | Yes              | `https://api.minimax.io/anthropic`   | `MiniMax-M2.7`    |
 | `kimi`     | Yes              | `https://api.kimi.com/coding/`       | `kimi-for-coding` |
 | `deepseek` | Yes              | `https://api.deepseek.com/anthropic` | `deepseek-chat`   |
diff --git a/docs/reference/providers.md b/docs/reference/providers.md
index d9d1432..abb29b5 100644
--- a/docs/reference/providers.md
+++ b/docs/reference/providers.md
@@ -6,7 +6,7 @@ Built-in and custom provider configurations.
 
 | Provider   | Base URL                             | Model             | API Key |
 | ---------- | ------------------------------------ | ----------------- | ------- |
-| `zai`      | `https://api.z.ai/api/anthropic`     | `glm-4.7`         | Yes     |
+| `zai`      | `https://api.z.ai/api/anthropic`     | `glm-5.1`         | Yes     |
 | `minimax`  | `https://api.minimax.io/anthropic`   | `MiniMax-M2.7`    | Yes     |
 | `deepseek` | `https://api.deepseek.com/anthropic` | `deepseek-chat`   | Yes     |
 | `kimi`     | `https://api.kimi.com/coding/`       | `kimi-for-coding` | Yes     |
diff --git a/internal/README.md b/internal/README.md
index 385a68b..05333e4 100644
--- a/internal/README.md
+++ b/internal/README.md
@@ -56,12 +56,12 @@ Example schema:
 default_provider: zai
 default_harness: claude
 default_models:
-  zai: glm-4.7
+  zai: glm-5.1
 providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
 ```
 
 ### `crypto/`
@@ -100,7 +100,7 @@ Built-in providers:
 
 | Provider   | Base URL                             | Model             | API Key |
 | ---------- | ------------------------------------ | ----------------- | ------- |
-| `zai`      | `https://api.z.ai/api/anthropic`     | `glm-4.7`         | Yes     |
+| `zai`      | `https://api.z.ai/api/anthropic`     | `glm-5.1`         | Yes     |
 | `minimax`  | `https://api.minimax.io/anthropic`   | `MiniMax-M2.7`    | Yes     |
 | `deepseek` | `https://api.deepseek.com/anthropic` | `deepseek-chat`   | Yes     |
 | `kimi`     | `https://api.kimi.com/coding/`       | `kimi-for-coding` | Yes     |
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 20c411b..ff05aa8 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -22,7 +22,7 @@ providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
 `
 	err := os.WriteFile(configPath, []byte(configContent), 0600)
 	if err != nil {
@@ -89,7 +89,7 @@ providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
 `
 	if err := os.WriteFile(configPath, []byte(configWithUnknownField), 0600); err != nil {
 		t.Fatal(err)
@@ -362,7 +362,7 @@ providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
 `
 		if err := os.WriteFile(oldConfigPath, []byte(configContent), 0600); err != nil {
 			t.Fatal(err)
@@ -513,7 +513,7 @@ providers:
   zai:
     name: Z.AI
     base_url: https://api.z.ai/api/anthropic
-    model: glm-4.7
+    model: glm-5.1
 `
 		if err := os.WriteFile(oldConfigPath, []byte(configContent), 0600); err != nil {
 			t.Fatal(err)
diff --git a/internal/config/migration_test.go b/internal/config/migration_test.go
index cf8462e..ba99c3c 100644
--- a/internal/config/migration_test.go
+++ b/internal/config/migration_test.go
@@ -260,7 +260,7 @@ func TestFormatMigrationChanges(t *testing.T) {
 	t.Run("FormatsChangesCorrectly", func(t *testing.T) {
 		changes := []MigrationChange{
 			{Provider: "minimax", Field: "model", Old: "MiniMax-M2", New: "MiniMax-M2.7"},
-			{Provider: "zai", Field: "model", Old: "glm-4.5", New: "glm-4.7"},
+			{Provider: "zai", Field: "model", Old: "glm-4.5", New: "glm-5.1"},
 		}
 
 		result := FormatMigrationChanges(changes)
diff --git a/internal/providers/registry.go b/internal/providers/registry.go
index 491ed69..c6a5f5f 100644
--- a/internal/providers/registry.go
+++ b/internal/providers/registry.go
@@ -4,7 +4,7 @@ var BuiltInProviders = map[string]ProviderDefinition{
 	"zai": {
 		Name:           "Z.AI",
 		BaseURL:        "https://api.z.ai/api/anthropic",
-		Model:          "glm-4.7",
+		Model:          "glm-5.1",
 		RequiresAPIKey: true,
 		EnvVars:        []string{"ANTHROPIC_DEFAULT_HAIKU_MODEL=glm-4.7-flash"},
 	},
diff --git a/internal/providers/registry_test.go b/internal/providers/registry_test.go
index 91edcb4..d604dd5 100644
--- a/internal/providers/registry_test.go
+++ b/internal/providers/registry_test.go
@@ -122,7 +122,7 @@ func TestGetBuiltInProvider(t *testing.T) {
 			wantExists:   true,
 			wantName:     "Z.AI",
 			wantBaseURL:  "https://api.z.ai/api/anthropic",
-			wantModel:    "glm-4.7",
+			wantModel:    "glm-5.1",
 			wantRequires: true,
 		},
 		{
diff --git a/tests/integration/full_workflow_test.go b/tests/integration/full_workflow_test.go
index e19a692..698ec96 100644
--- a/tests/integration/full_workflow_test.go
+++ b/tests/integration/full_workflow_test.go
@@ -129,7 +129,7 @@ func TestFullWorkflowHarnessSwitching(t *testing.T) {
 		DefaultHarness:  "claude",
 		Providers: map[string]config.Provider{
 			"anthropic": {Name: "Native Anthropic"},
-			"zai":       {Name: "Z.AI", BaseURL: "https://api.z.ai/api/anthropic", Model: "glm-4.7"},
+			"zai":       {Name: "Z.AI", BaseURL: "https://api.z.ai/api/anthropic", Model: "glm-5.1"},
 		},
 	}
 	if err := config.SaveConfig(context.Background(), tmpDir, cfg); err != nil {
@@ -183,7 +183,7 @@ func TestFullWorkflowListAndStatus(t *testing.T) {
 		DefaultProvider: "zai",
 		Providers: map[string]config.Provider{
 			"anthropic": {Name: "Native Anthropic"},
-			"zai":       {Name: "Z.AI", BaseURL: "https://api.z.ai/api/anthropic", Model: "glm-4.7"},
+			"zai":       {Name: "Z.AI", BaseURL: "https://api.z.ai/api/anthropic", Model: "glm-5.1"},
 			"minimax":   {Name: "MiniMax", BaseURL: "https://api.minimax.chat/v1", Model: "minimax-abab6.5"},
 			"deepseek":  {Name: "DeepSeek", BaseURL: "https://api.deepseek.com/v1", Model: "deepseek-chat"},
 		},