Silent failures with Opus 5

Hi, I keep finding that Opus 5 requests fail silently. I put in a fairly long prompt, hit enter, it goes away thinking for awhile, then just stops. No response, no error, no nothing. Refreshing the prompt tends to create the same effect. If I switch to an OpenAi model, it then works. v 2.15.0 (build 84) on macOS 26.5.2