Did something happen to Opus 4.8 today? First time I've seen this happen (and I use it daily): it almost totally stopped thinking, even at highest reasoning setting. And answered terribly.
I repeated same prompts with Opus 4.6, and it worked great.
Jeremy Howard (posted 2026-06-28) reported that Opus 4.8 "almost totally stopped…
Brief
Jeremy Howard reported on 2026-06-28 that Opus 4.8 suddenly degraded: at the highest reasoning setting it "almost totally stopped thinking" and gave terrible answers. He repeated the same prompts on Opus 4.6 and received good responses, implying a regression or service issue affecting only Opus 4.8.
Why it matters
Jeremy Howard (posted 2026-06-28) reported that Opus 4.8 "almost totally stopped thinking" and produced poor answers even when set to the highest reasoning setting.
Key details
- He reran the same prompts on Opus 4.6 and found 4.6 produced good results, indicating a regression or outage specific to Opus 4.8.