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ollama - 💡(How to fix) Fix Claude Code v2.1.154+ 发送的消息格式中，将 `system` 角色放入了 `messages` 数组，导致 Ollama 的 Anthropic 兼容层返回 400 错误。

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Describe the bug

Claude Code v2.1.154+ 发送的消息格式中，将 system 角色放入了 messages 数组，导致 Ollama 的 Anthropic 兼容层返回 400 错误。

错误信息：unknown variant 'system', expected 'user' or 'assistant'

To Reproduce

  1. 启动 Ollama（任意版本，包括最新 v0.23.0）
  2. 安装 Claude Code v2.1.154 或更高版本
  3. 设置环境变量 ANTHROPIC_BASE_URL=http://localhost:11434
  4. 运行 claude，发送任意消息
  5. 终端报错如上

Expected behavior

Ollama 应能正确处理 Claude Code 发送的新格式消息，或者提供一个兼容模式开关。

Environment

  • Ollama version: v0.23.0
  • Claude Code version: 2.1.156
  • OS: Windows 11
  • Model: qwen3.6:27b

Additional context

社区分析：https://zhuanlan.zhihu.com/p/2043723916825326284 同类问题（vLLM）：https://github.com/vllm-project/vllm/issues/44000

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FAQ

Expected behavior

Ollama 应能正确处理 Claude Code 发送的新格式消息，或者提供一个兼容模式开关。

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ollama - 💡(How to fix) Fix Claude Code v2.1.154+ 发送的消息格式中，将 `system` 角色放入了 `messages` 数组，导致 Ollama 的 Anthropic 兼容层返回 400 错误。