Opus 5 is currently #1 on Artificial Analysis Intelligence Leaderboard

Opus 5 is currently #1 on Artificial Analysis Intelligence Leaderboard(artificialanalysis.ai)

33 points by aarondong 3 hours ago | 19 comments

andy99 6 minutes ago |

#1 in a very close race is way less useful when you have to walk on eggshells to avoid triggering censorship (“safeguards”) that either refuse or knock it down to another model. I’ve almost completely stopped using Claude (except some legacy workflows) for this reason, reliability matters more than scoring 61 instead of 57. To me Claude is the most compromised and unreliable model (between the censorship and the id checking - which I have not experienced personally), it’s not worth whatever slight benchmaxxing they did for the latest release.

chmod775 6 minutes ago |

The more interesting finding here is that it's still the second most expensive model (after Fable 5) by a wide margin, with plenty of models essentially matching its score (~1-2% diff) for half the cost.

firasd 17 minutes ago |

Very interesting that one of the components is "AA-Omniscience Index"

AA-Omniscience Index (higher is better) measures knowledge reliability and hallucination. It rewards correct answers, penalizes hallucinations, and has no penalty for refusing to answer.

This seems to be a good proxy for param size/density and the ranking breaks down as such: Claude Fable 5 (with fallback), Gemini 3.1 Pro Preview, Claude Opus 5 (Max), Grok 4.6 (high), Gemini 3.6 Flash, GPT 5.6 Sol (Max)

I've thought for a while that Gemini 3.x has 'big model smell'

aarondong 3 hours ago |

Before getting too excited, take a look at the intelligence vs cost matrix: https://artificialanalysis.ai/models?intelligence-index-toke...

eli 24 minutes ago | |

Max is lot of extra reasoning. I wonder how many fewer tasks it solves on high. I bet that costs quite a lot less.

midnightbobarun 3 hours ago | |

5.6 Sol (max) being cheaper than all of these is wild, considering how good the output is too

nijave 37 minutes ago | | |

I think on swebench verified luna was only like 3% points lower for 1/5 the cost

Like 96% vs 93% or something

impulser_ 24 minutes ago | | |

It shouldn't be surprising OpenAI does have the most compute out of all the major labs. The only reason why Anthropic models are expensive is they are the most in demand models in the world and Anthropic is fighting for compute. The only way to you limit demand for your model is increasing API pricing this is also why Anthropic probably has great margin and probably is profitable compared to OpenAI.

giancarlostoro 50 minutes ago | | |

Probably because they made ASICs to run inference for less.

Schiendelman 1 hour ago | | |

This must be on API costs, not counting the $100/200 tiers, right?

sggyamg 9 minutes ago |

It's new, normal.

claude-ai 2 hours ago |

On my end, Opus 5 is Haiku level vs. Opus 4.8 (good) and Fable (superb).

Gets confused by permission prompts, cannot debug a failing test it caused (Opus 4.8 got it right after, without tens of rounds "thinking").

reilly3000 23 minutes ago | |

Are you using Claude Code/CoWork or an API client? I’m curious if it has different training that makes it more effective with specific instructions/ tool calling methods that are only implemented in official harnesses.

pixelesque 13 minutes ago | | |

I'm curious about this too, and it's difficult to get any information about this given everyone has different setups, workflows and use-cases.

I bizarrely had Opus 4.8 this week (in pi.dev within a podman container, using openrouter) start installing various python packages (and uv!) within the environment (not as root) when I asked it to code review some fairly basic Rust .rs files that were generally stand-alone (it did very nicely work out and write some stubs for them to build them and work out how they worked).

It only gave up with the weird Python installing stuff when it discovered one of the Python packages needed Tensorflow.

It seems pretty focused and persistent in continuing its initial approach, and I'm wondering if I need to alter some instructions / initial prompts to rein it in a bit...