diff --git a/docs/src/content/docs/reference/safe-outputs.md b/docs/src/content/docs/reference/safe-outputs.md
index 62a4d4d0273..8b38bdca6cc 100644
--- a/docs/src/content/docs/reference/safe-outputs.md
+++ b/docs/src/content/docs/reference/safe-outputs.md
@@ -1408,7 +1408,7 @@ Programmatically assigns GitHub Copilot coding agent to **existing** issues or p
 safe-outputs:
   assign-to-agent:
     name: "copilot"            # default agent (default: "copilot")
-    model: "claude-opus-4.6"   # default AI model (default: "auto")
+    model: "claude-sonnet-5"   # default AI model (default: "auto")
     custom-agent: "agent-id"   # default custom agent ID (optional)
     custom-instructions: "..."  # default custom instructions (optional)
     allowed: [copilot]         # restrict to specific agents (optional)
diff --git a/pkg/cli/workflows/test-assign-to-agent-with-model.md b/pkg/cli/workflows/test-assign-to-agent-with-model.md
index e2cc522efec..c79aa490ec0 100644
--- a/pkg/cli/workflows/test-assign-to-agent-with-model.md
+++ b/pkg/cli/workflows/test-assign-to-agent-with-model.md
@@ -14,7 +14,7 @@ on:
         description: 'AI model to use'
         required: false
         type: string
-        default: 'claude-opus-4.6'
+        default: 'claude-sonnet-5'
 
 permissions:
   actions: read
@@ -41,7 +41,7 @@ safe-outputs:
   assign-to-agent:
     max: 5
     name: copilot
-    model: claude-opus-4.6  # Default model to use when not specified per-item
+    model: claude-sonnet-5  # Default model to use when not specified per-item
     target: "triggering"     # Auto-resolves from workflow context (default)
     allowed: [copilot]       # Only allow copilot agent
 strict: false
@@ -58,7 +58,7 @@ Assign the Copilot agent to the issue with the specified AI model. The workflow
 1. **Default model configuration**: Set via `safe-outputs.assign-to-agent.model` in frontmatter (applies to all assignments in the workflow)
 
 **For issues event:**
-Assign the Copilot agent using the default model (Claude Opus 4.6) to the triggering issue.
+Assign the Copilot agent using the default model (Claude Sonnet 5) to the triggering issue.
 
 **For workflow_dispatch:**
 Assign the Copilot agent to issue #${{ github.event.inputs.issue_number }} using the default model configured in the frontmatter.
diff --git a/pkg/workflow/assign_to_agent.go b/pkg/workflow/assign_to_agent.go
index 26538a7e939..82daafaac53 100644
--- a/pkg/workflow/assign_to_agent.go
+++ b/pkg/workflow/assign_to_agent.go
@@ -11,7 +11,7 @@ type AssignToAgentConfig struct {
 	BaseSafeOutputConfig      `yaml:",inline"`
 	SafeOutputTargetConfig    `yaml:",inline"`
 	DefaultAgent              string   `yaml:"name,omitempty"`                       // Default agent to assign (e.g., "copilot")
-	DefaultModel              string   `yaml:"model,omitempty"`                      // Default AI model to use (e.g., "claude-opus-4.6")
+	DefaultModel              string   `yaml:"model,omitempty"`                      // Default AI model to use (e.g., "claude-sonnet-5")
 	DefaultCustomAgent        string   `yaml:"custom-agent,omitempty"`               // Default custom agent ID for custom agents
 	DefaultCustomInstructions string   `yaml:"custom-instructions,omitempty"`        // Default custom instructions for the agent
 	Allowed                   []string `yaml:"allowed,omitempty"`                    // Optional list of allowed agent names. If omitted, any agents are allowed.