Squash Odysseus development history

specs/model-providers/openai.md

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+# OpenAI Provider Shape
+
+Last updated: dev@e71f8ce | 2026-08-25
+
+## Scope
+
+Canonical provider ID `openai`; API dialects OpenAI Chat Completions and
+Responses; catalog reader `src/model_capability_readers/openai.py`.
+
+## Catalog Shape
+
+`GET /v1/models` returns `object: list` with `data[]` model cards containing
+`id`, `object`, `created`, and `owned_by`. This is identity and availability
+metadata only. It does not claim vision, tools, reasoning, modality, task, or
+context length. The record remains unknown and keeps the raw fields.
+
+## Request And Response Shape
+
+Chat uses `messages`, `tools[].function`, `tool_choice`, and
+`choices[].message|delta`; Responses uses `input`, flattened tools, output
+items, and typed stream events. OpenAI may support a parameter at the platform
+level while individual models differ. A later model registry or probe must
+scope that fact before it becomes canonical model capability.
+
+## Fallback And Safety
+
+An explicit endpoint kind selects this provider. Automatic reader detection accepts exact `openai.com` or a dot-delimited subdomain after normalizing case/trailing dots; it is a normalization hint rather than a trust boundary. Do not parse model IDs or ownership labels. If a proxy returns richer fields while explicitly configured as OpenAI, the reader preserves them as raw evidence but keeps capability unknown.
+
+## Current Gaps
+
+- OpenAI's Models API does not publish the per-model capability shape needed
+  for automatic canonical classification.
+- Runtime model-specific sampling/reasoning behavior still needs a maintained
+  structured registry or endpoint probes.