The Responses-API "original" image detail is an oh-my-pi extension that
preserves native resolution (snapcompact renders terminal-glyph frames
that do not survive the "auto" downscale). GitHub Copilot's Responses
endpoint rejects detail: "original" with an HTTP 400, so any request
carrying such an image failed outright.
- Add a supportsImageDetailOriginal compat flag in the catalog, resolved
to false whenever the model resolves to the Copilot host (by provider id
or base-URL marker, via modelMatchesHost, mirroring the Anthropic compat
builder) and true for every other host, alongside the existing
strictResponsesPairing Responses-only flag (same three type touch-points:
optional on OpenAICompat, omitted from the chat-completions resolved type,
required on the Responses resolved type).
- Clamp the image detail hint to "auto" when the host does not support
"original" at both Responses image-emission sites (user content and
tool-result content). Every other host preserves native-resolution
frames, so snapcompact is unaffected.
Host-aware detection (rather than a bare provider-string check) keeps the
clamp in force when a model is pointed at the Copilot Responses host under
a different provider id, which would otherwise reintroduce the 400; a
regression test covers that path.
Closes#2822
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Wolfgang Schoenberger
2f2011f5ee