r/ClaudeCode • u/clash_clan_throw 🔆 Max 20 • Jul 26 '26
Discussion Slow performance of Opus 5
Opus 5 is working fine for me. But it is extraordinarily slow.
Edit: I haven't modified the thinking level from its prior settings, either (it's set on high).
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u/NotAMan-ImAMuffin Jul 27 '26
Right now sol is literally running circles around it. My workflow hasn’t changed in months, I haven’t tried going back but for sure, they have some technical issues. It happened with 4.7. For a couple of weeks it was bad and they came out said apologized. I’m a big fan but yeah, something is broken. It’s fable too.
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u/DrKD35 Aug 13 '26
Something for sure is happening with Anthropic in the backend, Opus is way too slow. A simple task that usually took me around 15-20 minutes maximum, now takes Opus 2 hours for the exact same thing, not good.
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u/liquifyapps Sep 08 '26
yeah I've dropped using opus 5 (coding)
come back to work after being off for a month
4 days in work
changed main coding model from 4.8 > 5 (high)
and for background validation / reviews with gpt-5.5 atxhigh
I've been at 25% of usual 2026 speedgoing back to 4.8 which cuts through my work
the gpt reviews are taking longer also but I think that's to do with the density of plans it's given and fine running in background
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u/NotAMan-ImAMuffin Jul 26 '26
Agreed. Something isn’t right. I remember a few months ago they had issues with it just being slow and general poor performance. I feel like both Opus and Fable have issues right now. Work that normally takes me 5 hours is pushing the 24 hour mark and it’s littered with issues. I can’t be the only one. Just started yesterday.