Osaurus integration leads to `Exceeded model context window size`

[Oneiros90]

Description

I'm trying to use Osaurus as a model provider in a macOS environment, since I want to use Apple's Foundation local model. This is my configuration:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "osaurus": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "Osaurus",
      "options": {
        "baseURL": "http://127.0.0.1:1337"
      },
      "models": {
        "foundation": {
          "name": "Apple Foundation Model",
          "limit": {
            "context": 200000,
            "output": 65536
          }
        }
      }
    }
  }
}

And this is the error I get when I try to push any prompt: Exceeded model context window size

I am working in VSCode but I also tried in the terminal through opencode run --model osaurus/foundation "hello"

Plugins

None

OpenCode version

1.0.220

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

macOS 26.2

Terminal

No response