let currentModel = models[0];

if (settings.model) {                                                                                                                                                              
  const match = resolveModelPreference(models, settings.model);
  if (match) {                                                                                                                                                                     
    currentModel = match;                                       
  }
}

The ANTHROPIC_MODEL environment variable is never read, so environment-based model configuration is silently ignored.                                                              
 
Reproduction                                                                                                                                                                       
                                                                
1. Set ANTHROPIC_MODEL=glm-4.7 (or any custom model)                                                                                                                               
2. Start Claude Code via ACP protocol
3. Send a prompt request                                                                                                                                                           
4. Capture network traffic - the actual model used is claude-sonnet-4-6 instead of glm-4.7
                                                                                                                                                                                   
Fix
                                                                                                                                                                                   
Added priority-based model selection that respects the ANTHROPIC_MODEL environment variable, aligning with the main Claude Code CLI behavior:                                      
 
// Model priority (highest to lowest):                                                                                                                                             
// 1. ANTHROPIC_MODEL environment variable                      
// 2. settings.model (user configuration)
// 3. models[0] (default first model)                                                                                                                                              
if (process.env.ANTHROPIC_MODEL) {
  const match = resolveModelPreference(models, process.env.ANTHROPIC_MODEL);                                                                                                       
  if (match) {                                                  
    currentModel = match;
  }
} else if (settings.model) {
  const match = resolveModelPreference(models, settings.model);                                                                                                                    
  if (match) {
    currentModel = match;                                                                                                                                                          
  }                                                             
}

This matches the model selection priority used by the main Claude Code CLI.                                                                                                        
 
Testing                                                                                                                                                                            
                                                                
- Verified ANTHROPIC_MODEL is now respected when set                                                                                                                               
- Verified settings.model still works when ANTHROPIC_MODEL is not set
- Verified default model (models[0]) is used when neither is set                                                                                                                   
                                                                                                                                                                                   
Breaking Change
                                                                                                                                                                                   
None - this fix makes behavior more consistent with user expectations and the main CLI.