Fast mode on Opus 4.8 stops working on November 30, 2026 and errors rather than falling back, so you need to move to Opus 5.5. Admins also get pooled team budgets and layered policies, and you can set multi-agentUsing several AI agents on one problem — splitting work in parallel, checking each other, or filling different roles like planner and reviewer.Full definition → effort.
Key takeaways · AI-distilled
With managed.policy_mode: layered, every Claude apps gateway policy that matches a developer now applies, each merged over the ones listed below it, rather than only the first match.
Pooled group budgets give a group one shared monthly budget on top of each member's own limit, set with pooled_budget on the gateway's spend limits admin API.
The gateway now checks every model a request names against availableModels, deniedModels and models, and a request naming a blocked model gets a 400 that names the field.
Server-managed settings for Team and Enterprise logins now apply without an approval prompt when fetched from Anthropic's API, and a stored copy that does not verify is refused.
The release fixes --restricted sessions uploading files from outside the working directories when a Read allow rule covered them.
Terms in this piece · Glossary
multi-agent — Using several AI agents on one problem — splitting work in parallel, checking each other, or filling different roles like planner and reviewer.
