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Benchmarking Opus 5 on SlopCodeBench

https://github.com/humanlayer/advanced-context-engineering-for-coding-agents/blob/main/benchmarking-opus-5-on-slop-code-bench.md
38•dhorthy•1h ago

Comments

dcl•35m ago
finally the benchmark for me
dhorthy•26m ago
i hope that is because you hate slop and not because you write it
Johnny_Bonk•33m ago
I haven't joined your chats in a while but glad to see you put this together, I truly feel as though opus 5 is not much of an improvement. The only time i ever felt a wow factor was opus 4, 4.6 and fable pre trump admin lobotimizing
dhorthy•28m ago
yeah this was just a start - the fastest cheapest thing we could try for a brand new model.

I'm hoping to do some more work with sol/fable in the mix as well as exploring more languages and curating the problem set to include more of the benchmark

I also kinda felt like opus4.5 was dumber than 4.1 personally, maybe a little biased since 4.5 was 2.5x faster and 2.5x cheaper seems to indicate its a smaller model

Johnny_Bonk•16m ago
yeah i agree
dan_gee•10m ago
As someone who doesn't use AI, this is totally incomprehensible to me.

You might as well be talking about the difference between smoking Maui Wowie and Grandaddy Purp.

scrollaway•6m ago
How is this useful or insightful?

You ever go to forums full of entomology specialists and tell them you don’t understand their fancy terms?

killingtime74•12m ago
Did you not benchmark latest GPT 5.6 or GLM 5.1/Kimi K3 because of cost? I can run them if you share how you ran them
dhorthy•7m ago
no i'm spinning those up at some point this week. here's the first few prompts I used (claude opus 5 as the research orchestrator), (these were interspersed with lots of tools and assistant messages but it should get you kicked off.

> fetch this article for slopcodebench and help me run an eval on a subset of problems with opus 5 https://arxiv.org/html/2603.24755v1 > Get all the context, fetch any mentioned repos, and then propose a plan to me.

> i have an anthropic API key in .... > Let's do the three challenges with Opus 4.8 and Opus 5 and Fable please. I like your minimal set. Let's try it. What do you need from me?

> Actually I changed my mind. I want to do two of the easy ones you picked and then I want you to pick the one with more checkpoints, maybe one of the harder ones, not the very hardest one but one with a higher number of checkpoints.

> Actually let's do one easy, one medium, and one hard problem please. If we have a hard problem I'd like to see that.

> lets rock - i think lets just do opus 4.8 and sonnet 5 and opus 5 since we our ZDR will block fable

Our position on open-weights models

https://www.anthropic.com/news/position-open-weights-models
331•surprisetalk•2h ago•415 comments

DConf 2026 in London

https://dconf.org/2026/index.html
25•teleforce•57m ago•2 comments

Benchmarking Opus 5 on SlopCodeBench

https://github.com/humanlayer/advanced-context-engineering-for-coding-agents/blob/main/benchmarki...
44•dhorthy•1h ago•10 comments

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