### 新功能
- **最新前沿模型** — 通过支持的提供商（包括 GitHub Copilot）使用 Claude Opus 5.5、GPT-6 Sol 和 GPT-6 Luna。参见[选择模型](https://github.com/earendil-works/pi/blob/v0.87.1/packages/coding-agent/docs/models.md#select-a-model)。
- **xAI 默认使用 Grok 4.7** — 新的 xAI 会话现在默认使用 Grok 4.7。参见[提供商身份验证](https://github.com/earendil-works/pi/blob/v0.87.1/packages/coding-agent/docs/providers.md#use-an-api-key-from-the-environment)。
### 新增
- 为 GitHub Copilot 新增继承的 Claude Opus 5.5、GPT-6 Sol 和 GPT-6 Luna 支持。
- 为 OpenAI API 密钥和 OpenAI Codex 订阅新增继承的 GPT-6 Sol 和 GPT-6 Luna 支持。
- 为 Anthropic 新增继承的 Claude Opus 5.5 支持，具备自适应思考和 1M 上下文窗口。
### 变更
- 将 xAI 默认模型更改为 Grok 4.7。
### 修复
- 修复了 Claude Fable 5.1 拒绝拆分轮次压缩摘要的问题，方法是清晰分隔对话并使用面向续接的指令（[#9908](https://github.com/earendil-works/pi/pull/9908)，由 [@davidbrai](https://github.com/davidbrai) 提交）。
- 修复了缺失或无效的 `--mode` 值被静默忽略的问题，现在会报告错误并以非零状态退出（[#9045](https://github.com/earendil-works/pi/issues/9045)）。
- 修复了继承的仅图片用户消息因包含空文本部分而被某些 OpenAI 兼容提供商拒绝的问题（[#9797](https://github.com/earendil-works/pi/issues/9797)）。
- 修复了继承的 Anthropic OAuth 请求报告过时的 Claude Code 版本的问题。
### New Features
- **Latest frontier models** — Use Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna through supported providers, including GitHub Copilot. See [Choose a Model](https://github.com/earendil-works/pi/blob/v0.87.1/packages/coding-agent/docs/models.md#select-a-model).
- **Grok 4.7 by default for xAI** — New xAI sessions now default to Grok 4.7. See [Provider Authentication](https://github.com/earendil-works/pi/blob/v0.87.1/packages/coding-agent/docs/providers.md#use-an-api-key-from-the-environment).
### Added
- Added inherited Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna support for GitHub Copilot.
- Added inherited GPT-6 Sol and GPT-6 Luna support for OpenAI API keys and OpenAI Codex subscriptions.
- Added inherited Claude Opus 5.5 support for Anthropic with adaptive thinking and a 1M context window.
### Changed
- Changed the default xAI model to Grok 4.7.
### Fixed
- Fixed split-turn compaction summaries being refused by Claude Fable 5.1 by clearly separating the conversation and using continuation-oriented instructions ([#9908](https://github.com/earendil-works/pi/pull/9908) by [@davidbrai](https://github.com/davidbrai)).
- Fixed missing or invalid `--mode` values being silently ignored instead of reporting an error and exiting with a nonzero status ([#9045](https://github.com/earendil-works/pi/issues/9045)).
- Fixed inherited image-only user messages being rejected by some OpenAI-compatible providers because they included an empty text part ([#9797](https://github.com/earendil-works/pi/issues/9797)).
- Fixed inherited Anthropic OAuth requests reporting an outdated Claude Code version.