feat(provider): add bailian-coding-plan as native provider

[Jlan45]

Add Alibaba Cloud Model Studio Coding Plan (bailian-coding-plan) as a native provider with support for Qwen3.5 Plus, Qwen3 Max, Qwen3 Coder, MiniMax M2.5, GLM-5/4.7, and Kimi K2.5 models.

Uses Anthropic SDK with DashScope endpoint for API compatibility. Supports API key configuration via environment variable, auth storage, or config file.

Issue for this PR

Closes #

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Add Alibaba Cloud China Bailian Coding Plan as opencode native AI Provider

How did you verify your code works?

Use opencode auth login command, you will see Model Studio Coding Plan in the list

Screenshots / recordings

If this is a UI change, please include a screenshot or recording.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

If you do not follow this template your PR will be automatically rejected.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[HCenggel]

I urgently need this feature

[vadim-isakov]

Thanks for the effort, but I'd suggest closing this PR. It introduces an anti-pattern that bypasses the intended architecture.

The Problem

Hardcoding providers in BUILTIN_PROVIDERS bypasses models.dev where providers should be defined. This:

• Creates maintenance burden (every new provider needs an opencode PR)
• Duplicates data in two places
• Sets a precedent for others to copy this pattern

The Correct Fix

Update models.dev instead. PRs already exist:

• #1023 - alibaba-coding-plan (global)
• #1030 - alibaba-coding-plan-cn (China)

These are clean, validated, and waiting for review.

Workaround for Users

In the meantime, users can add this to ~/.config/opencode/opencode.json:

{
  "provider": {
    "alibaba-coding-plan": {
      "name": "Alibaba Coding Plan",
      "npm": "@ai-sdk/anthropic",
      "api": "https://coding-intl.dashscope.aliyuncs.com/apps/anthropic/v1",
      "env": ["BAILIAN_CODING_PLAN_API_KEY"],
      "models": {
        "qwen3.5-plus": {
          "name": "Qwen3.5 Plus",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text", "image", "video"], "output": ["text"] },
          "limit": { "context": 1000000, "output": 65536 },
          "cost": { "input": 0, "output": 0 }
        },
        "qwen3-max": {
          "name": "Qwen3 Max",
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 262144, "output": 65536 },
          "cost": { "input": 0, "output": 0 }
        },
        "qwen3-coder-next": {
          "name": "Qwen3 Coder Next",
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 262144, "output": 65536 },
          "cost": { "input": 0, "output": 0 }
        },
        "qwen3-coder-plus": {
          "name": "Qwen3 Coder Plus",
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 1048576, "output": 65536 },
          "cost": { "input": 0, "output": 0 }
        },
        "glm-5": {
          "name": "GLM-5",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 202752, "output": 16384 },
          "cost": { "input": 0, "output": 0 }
        },
        "glm-4.7": {
          "name": "GLM-4.7",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 202752, "output": 16384 },
          "cost": { "input": 0, "output": 0 }
        },
        "minimax-m2.5": {
          "name": "MiniMax M2.5",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 1048576, "output": 32768 },
          "cost": { "input": 0, "output": 0 }
        },
        "kimi-k2.5": {
          "name": "Kimi K2.5",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text", "image", "video"], "output": ["text"] },
          "limit": { "context": 262144, "output": 32768 },
          "cost": { "input": 0, "output": 0 }
        }
      }
    },
    "alibaba-coding-plan-cn": {
      "name": "Alibaba Coding Plan (China)",
      "npm": "@ai-sdk/anthropic",
      "api": "https://coding.dashscope.aliyuncs.com/apps/anthropic/v1",
      "env": ["BAILIAN_CODING_PLAN_API_KEY"],
      "models": {
        "qwen3.5-plus": {
          "name": "Qwen3.5 Plus",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text", "image", "video"], "output": ["text"] },
          "limit": { "context": 1000000, "output": 65536 },
          "cost": { "input": 0, "output": 0 }
        },
        "qwen3-max": {
          "name": "Qwen3 Max",
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 262144, "output": 65536 },
          "cost": { "input": 0, "output": 0 }
        },
        "qwen3-coder-next": {
          "name": "Qwen3 Coder Next",
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 262144, "output": 65536 },
          "cost": { "input": 0, "output": 0 }
        },
        "qwen3-coder-plus": {
          "name": "Qwen3 Coder Plus",
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 1048576, "output": 65536 },
          "cost": { "input": 0, "output": 0 }
        },
        "glm-5": {
          "name": "GLM-5",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 202752, "output": 16384 },
          "cost": { "input": 0, "output": 0 }
        },
        "glm-4.7": {
          "name": "GLM-4.7",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 202752, "output": 16384 },
          "cost": { "input": 0, "output": 0 }
        },
        "minimax-m2.5": {
          "name": "MiniMax M2.5",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text"], "output": ["text"] },
          "limit": { "context": 1048576, "output": 32768 },
          "cost": { "input": 0, "output": 0 }
        },
        "kimi-k2.5": {
          "name": "Kimi K2.5",
          "reasoning": true,
          "tool_call": true,
          "modalities": { "input": ["text", "image", "video"], "output": ["text"] },
          "limit": { "context": 262144, "output": 32768 },
          "cost": { "input": 0, "output": 0 }
        }
      }
    }
  }
}

Note: Coding Plan is a flat monthly subscription (¥7.9-200/month with request limits), not pay-per-token, so cost: 0 is correct.

Set your API key:

export BAILIAN_CODING_PLAN_API_KEY=sk-your-key

Then use:

opencode -m alibaba-coding-plan/glm-5

Suggestion

I'd recommend closing this PR and helping review/merge the models.dev PRs instead. That's the proper long-term fix.

[jnd0]

I was digging into this and I think PR is trying to solve this: #14819

[jnd0]

This can now be closed as it is already available. Implemented by anomalyco/models.dev#1023 and anomalyco/models.dev#1030