You'll noticeTier: how much it should matter to you
4Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
BedrockArea: what it touches
ImprovementsKind: in v2.1.228,
What probably matters to youSection of the release
What
The AWS Bedrock backend was rebuilt. It no longer swaps in a custom stream class; instead it rewrites each outgoing request and translates Bedrock's binary event stream into a standard server-sent-events response, so streaming and errors behave like every other backend.
Details
The rewrite moves the model name into the /model/{id}/invoke or /model/{id}/invoke-with-response-stream path, lifts anthropic-beta header values into the request body, and SigV4-signs the result.
Responses whose content type includes application/vnd.amazon.eventstream are converted to text/event-stream.
Bedrock exception shapes are emitted as event: error frames in the stream rather than thrown as backend-specific errors.
Evidence
application/vnd.amazon.eventstream
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed /tui reverting the session to an earlier model when /model had been changed since the last response
