# Silent degradation is back, Fable and Mythos 5.2 perform at level of Opus 5.5

- HackerByte page: <https://hackerbyte.net/en/stories/performance-regressions-in-the-latest-versions-of-ai-models-fable-and-mythos-com-50448772>
- Original source: <https://twitter.com/sfxnz/status/2120058367825908031>
- Hacker News discussion: <https://news.ycombinator.com/item?id=50448772>
- Submitted to Hacker News: 2026-11-11T01:33:27.000Z

Performance regressions in the latest versions of AI models Fable and Mythos, compared to the Opus model.

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