Description
Experiencing significantly degraded response quality on Claude Opus 4.6 via Claude Code over the past few hours (April 3, 2026). Responses feel slow, unfocused, and lower quality than usual — "brain fog" is the best description.
Context
- This follows known incidents from March 31 – April 1 (Opus 4.6 / Sonnet 4.6 timeouts, Haiku 4.5 elevated errors)
- Status page shows all clear as of April 2, but the degraded quality persists
- Fresh conversations don't resolve it
- Model: Claude Opus 4.6 via Claude Code CLI
Expected behavior
Normal response quality and coherence.
Actual behavior
Noticeably worse reasoning, coherence, and overall response quality compared to baseline.
Environment
- Claude Code CLI (latest)
- macOS (Darwin 24.1.0)
- Model: claude-opus-4-6
Description
Experiencing significantly degraded response quality on Claude Opus 4.6 via Claude Code over the past few hours (April 3, 2026). Responses feel slow, unfocused, and lower quality than usual — "brain fog" is the best description.
Context
Expected behavior
Normal response quality and coherence.
Actual behavior
Noticeably worse reasoning, coherence, and overall response quality compared to baseline.
Environment