You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
5Signal: worth watching, 1 to 5
StreamingArea: what it touches
ImprovementsKind: in v2.1.228,
What probably matters to youSection of the release
What
Responses can now contain blocks of type fallback (the point where the API switched models) and mid_conv_system. Token accounting, block dispatch and the streaming handler all handle both explicitly, counting them as "other" tokens and returning quietly rather than treating them as unknown. An additional 400-error classifier also now recognises the effort_unsupported upstream error class.
Details
The existing output_config text match for that error class remains alongside the new classifier.
Evidence
case "mid_conv_system":
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
