Bug: capabilities overridden for @ai-sdk/openai-compatible providers

[Claud]

Description

Description

When using a custom provider with @ai-sdk/openai-compatible, explicitly defined model capabilities are ignored and replaced with default values.

Other fields (family, release_date, limit, variants) are preserved correctly.

Notes

• This only happens for @ai-sdk/openai-compatible
• Same models via other providers (e.g. OpenRouter / Anthropic) correctly preserve capabilities
• Looks like capabilities are being normalized/overridden internally

Related

#21627

Plugins

No response

OpenCode version

1.4.3

Steps to reproduce

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "omniroute": {
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "http://localhost:20128/v1"
      },
      "models": {
        "minimax/minimax-m2.7": {
          "name": "minimax-m2.7",
          "family": "minimax",
          "release_date": "2026-03-18",
          "capabilities": {
            "reasoning": true,
            "temperature": true,
            "attachment": true
          }
        }
      }
    }
  }
}

Run:

opencode-cli models omniroute --verbose

Actual

"capabilities": {
  "temperature": false,
  "reasoning": false,
  "attachment": false
}

Expected

"capabilities": {
  "temperature": true,
  "reasoning": true,
  "attachment": true
}

Screenshot and/or share link

No response

Operating System

Windows 11

Terminal

Windows Terminal