I use Claude on the $20/mo plan, mainly for research, "rubber duckying," and as an idea soundboard (I was using Fable for this but am now relegated to Opus 4. 8 or Sonnet 5), and recently noticed a severe downturn in Opus 4. 8 response quality in high-context situations.
Source: [Hacker News](https://news.ycombinator.com/item?id=49027099)