Openrouter says Opencode May Not Be Passing Provider Object to OpenRouter

Description

Guys, I am using Opencode with OpenRouter. Several times i have seen bill spikes. Upon closer inspection via the Account UI - https://openrouter.ai/logs/, i could see that OpenROuter was routing me to providers THAT WERE NOT DEFINED in my opencode.jsonc ( attached here ).

I sent email to 'Linus (Support) support@openrouter.ai' and long story short - this dude says 'OpenCode may not be passing the provider object to OpenRouter at all'. I have provided my opencode.jsonc file 2x ( along with other screenshots ) but they have refused to investigate or clarify clearly what is the issue.

Fyi, the relevant snippet in my opencode.jsonc is;

    "openrouter": {
    
        "npm": "@ai-sdk/openai-compatible",
        "name": "OpenRouter",
        
        "options": {
          "baseURL": "https://openrouter.ai/api/v1",
          "apiKey": "sk-or-v1-my-key-here",
          "setCacheKey": true          
        },
    
        "models": {
        
           "deepseek/deepseek-v4-pro": {
           
               "name": "DeepSeek V4 Pro",
               "tool_call": true,
               "reasoning": true,
               "temperature": true,
               "attachment": true,
               
               "modalities": {
               
                 "input": ["text" ],
                 "output": ["text"]
               },
               
               "limit": { 
               
                    "context": 1048576, 
                     "output": 393216  
               },

               "options": { 
               
                    "reasoningEffort": "high",               // high, xhigh
                    
                    "provider": {                            // Tell OpenRouter to use only this endpoint
                    
                         "only": ["deepseek"],
                         "allow_fallbacks": false
                    }
                    // end provider 
               }
               // end options
           }
           // end 
          
        }
        // end models 
    }
    // end openrouter 

What can i do ? Anything wrong in my config or is OpenRouer just giving me the run-around.
Thanks in advance.

Plugins

None

OpenCode version

1.18+

Steps to reproduce

1. Any model - choose a provider and just see it drift to another model in their https://openrouter.ai/logs/ ?

Screenshot and/or share link

No response

Operating System

AlmaLinux 9.5

Terminal

XFCE Terminal