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fix(openai): preserve upstream model context window limits (#68)
Preserve upstream default and maximum context windows independently, including unknown values, and keep xAI limits provider-owned. Add catalog and API regression coverage and document the client contract. Co-authored-by: zhangwentian <2han9wen71an@gmail.com> Co-authored-by: Codex <noreply@openai.com>
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@@ -155,6 +155,11 @@ Responses WebSocket 仅接受文本 `response.create`,同一连接串行执行
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`GET /v1/models` 默认返回 OpenAI 兼容列表 `{"object": "list", "data": [...]}`;请求携带非空
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`client_version` query 参数(Codex 客户端)时改为返回 Codex 专用目录合同 `{"models": [...]}`。
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Codex 专用目录中的 `context_window` 与 `max_context_window` 分别表示默认上下文窗口和客户端本地
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覆盖的上限。OpenAI Provider 分别传递上游目录中的对应字段,缺失时保留 `null`;网关不通过部署配置
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覆盖这些值。Codex 客户端配置 `model_context_window` 后,按该值与非空 `max_context_window` 的较小值
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使用窗口;上限为空时保留客户端本地值。xAI 目录只声明一个窗口,其 Provider 继续以该值作为客户端覆盖上限。
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OpenAI 路径保留客户端 Responses wire 语义:请求 body 的未知字段和字段顺序保持不变(受控模型
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映射除外),HTTP SSE 与 WebSocket 的上游业务事件字节原样转发,response ID 按 opaque 值处理而不
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假设 UUID 或固定长度;OpenAI 上游错误 envelope 和允许下发的 opaque header 值也不由 canonical
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