Z.ai subscription with opencode

README.md

Z.ai subscription with opencode

I do not guarantee that this is actually billed on your subscription inclusive volume and not as API consumption. Since Z.ai has no near realtime API usage information, I could not check it. Update: after 2 days of using it, no extra money was decucted from my credits. Guess tht means it works.

Create a custom provider

First we need to create a custom provider for the Z.ai anthropic API. Follow the instructions for adding a custom provider to opencode.

• Name it zai-anthropic
• Enter your API-key

Configure the custom-provider

Edit opencode.json and add this:

    "provider": {
        "zai-anthropic": {
            "npm": "@ai-sdk/anthropic",
            "options": {
                "baseURL": "https://api.z.ai/api/anthropic/v1"
            },
            "models": {
                "glm-4.5": {
                    "name": "glm-4.5"
                }
            }
        }

Make this model default if you wish:

    "model": "zai-anthropic/glm-4.5",

Thanks for the config!

Based on their docs, it seems they support both models for the subscription.

    "zai-anthropic": {
      "npm": "@ai-sdk/anthropic",
      "options": {
        "baseURL": "https://api.z.ai/api/anthropic/v1"
      },
      "models": {
        "glm-4.5-air": {
          "name": "glm-4.5-air"
        },
        "glm-4.5": {
          "name": "glm-4.5"
        }
      }
    }

I'm successfully using LiteLLM with the ZAI-GLM-4.5 model.
I've been testing for the last few hours, everything is great. I use it in GitHub Copilot also works in Cline.

The following configuration is working perfectly:

model_name: "ZAI-GLM-4.5"
litellm_params:
  model: "anthropic/GLM-4.5"
  api_base: "https://api.z.ai/api/anthropic"
  api_key: os.environ/ZAI_CODE

this option simulates working in Claude code

model_name: "ZAI-GLM-4.5" 
litellm_params:
  model: "anthropic/claude-sonnet-4-20250514" 
  api_base: "https://api.z.ai/api/anthropic"
  api_key: os.environ/ZAI_CODE

Worked for me in OpenRouter as well. Worked with Claude Code as well. Better results with Claude Code.

@iFedyna, first I also thought I'll use LiteLLM. It's such a great tool for proxying. But opencode has such flexible provider config options that it wasn't neccessary.

@nathabonfim59 nice, but what is your use case for the air model? Faster sub-agents? Do you have even more requests with air? Anybody knows how they meter it or where I can see my remaining volume?

@olafgeibig It was important for me to find a limit and LiteLLM allows you to count. Yesterday I used 32,000,000 tokens and made 540 calls to the model my lite plan, even with this volume I did not reach the limit. I also tried air in the calls of the tools very badly with the copilot.

Most likely they have an internal counting system. I did not find information on the official website.

Up to about 120 prompts per 5-hour cycle

A “prompt” refers to a single user query sent. It typically triggers around 15–20 model calls, consuming hundreds of thousands of tokens. See the FAQ for details.

based on this information from 1200 model calls in 5 hours limit.
Compared to others, this is the best offer there can be.

@iFedyna That's amazing. What a crazy good offer.

@olafgeibig today I reached the limit of 190 requests and 9000000 tokens. And I have -0.08 cents on my account. So the counting system is a little different than I thought. In three days I have 1333 requests 73 million tokens

@olafgeibig today I reached the limit of 190 requests and 9000000 tokens. And I have -0.08 cents on my account. So the counting system is a little different than I thought. In three days I have 1333 requests 73 million tokens

are you working on anything and using so many tokens / requests or are you just trying to see the limit of the service?

@konstantinosbotonakis creating projects. Calculating just for myself to see which plan suits me best for my tasks. For example, Rovo Dev CLI give 20 million per day without restrictions on requests to choose from two models Sonnet 4 and GPT5. Price 7.53 usd. I also use it to see who can handle which tasks and how.

@nathabonfim59 nice, but what is your use case for the air model? Faster sub-agents?

Mostly /compact and I have an agent to fetch parts of the documentation and feed back to the main one.