反代反重力的 claude 在 opencode 中使用出现 unexpected EOF 错误

[airoswell]

Is it a request payload issue?
[ ] Yes, this is a request payload issue. I am using a client/cURL to send a request payload, but I received an unexpected error.
[x] No, it's another issue.

Describe the bug

使用反重力反代出来的 claude-sonnet-4-5(-thinking), claude-opus-4-5(-thinking)，然后在 opencode 里通过 "npm": "@ai-sdk/anthropic"调用，频繁出现下面截图所示的错误。

相同的端口在 claude code 中使用非常顺畅，不会出任何错误。

CLI Type
反重力

Model Name
claude-sonnet-4-5(-thinking), claude-opus-4-5(-thinking)

LLM Client
opencode

Request Information
The best way is to paste the cURL command of the HTTP request here.
Alternatively, you can set request-log: true in the config.yaml file and then upload the detailed log file.

Expected behavior
不出现错误，像在 claude code 中使用一样。

Screenshots

OS Type
macOS 15.0 (24A335)

Additional context

Opencode 配置

"CPAPlus-anthropic": {
      "npm": "@ai-sdk/anthropic",
      "name": "CPAPlus-anthropic",
      "options": {
        "baseURL": "http://localhost:8318/v1",
        "apiKey": "sk-123456",
      },
      "models": {
        "kiro-claude-sonnet-4-5-agentic": {
          "name": "kiro-claude-sonnet-4-5-agentic",
          "reasoning": true,
          "tool_call": true,
        },
        "claude-opus-4-5-thinking": {
          "name": "claude-opus-4-5-thinking",
          "reasoning": true,
          "tool_call": true,
        },
        "claude-sonnet-4-5-thinking": {
          "name": "claude-sonnet-4-5-thinking",
          "reasoning": true,
          "tool_call": true,
        },
      },
    },