10 comments

  • simonw 35 minutes ago
    This is the page for the "max" reasoning setting. The page for xhigh is https://artificialanalysis.ai/models/claude-opus-5-5-xhigh and the page for medium (the default setting) is https://artificialanalysis.ai/models/claude-opus-5-5-medium

    I've failed twice to get "Generate an SVG of a pelican riding a bicycle" to work with max, because in both cases it ran out of the 128,000 token budget while it was still reasoning about the problem.

    I'm suspicious that "max" may be virtually useless if it's that easy to have it overthink to the point that it doesn't get to a response.

    Transcript for one attempt here - expand the "Reasoning trace" bit to see it: https://tools.simonwillison.net/markdown-svg-renderer?url=ht...

    • RGS1811 32 minutes ago
      "This is a classic test request..."

      I know there's been discussion about whether pelicanmaxxing is happening, but this is at least evidence that Claude was explicitly exposed to this problem.

    • samuelknight 27 minutes ago
      I have experienced this with open weight models too. "Max" is for benchmaxxing the intelligence metric and is not meant for use in productive work. Like drawing pelicans.
    • sidewndr46 8 minutes ago
      I've asked Opus 5 Max for what I thought were easy tasks at work to be completed. It always fails after reaching a tool limit.

      I asked Opus 5 High for the same task and requested it to minimize tool usage. It produced an answer in a few minutes that I was deploying to my target platform about 30 minutes later.

    • Someone1234 28 minutes ago
      For people with any kind of budget, Opus 5.5's [Medium] actually can make sense dollar per intelligence/dollar per task wise. Heck, it puts some other models to shame. [Max]'s cost is completely unhinged.

      My most exciting recent release is actually 5.6 Luna, not because it is the best on any index, but the dollar per work is insane value for money. I find myself more exciting by "value" than hypothetical ceilings because I'm just not in that budget category.

    • az226 33 minutes ago
      How did you get the reasoning trace? Is it the actual one or the summarized one?
      • simonw 33 minutes ago
        It's the summarized one returned by their API.

        Piping the visible reasoning trace through their token counter API (I use https://tools.simonwillison.net/claude-token-counter for that) counts 27,888 tokens, so it's definitely a summary of the 128,000 actual token trace.

    • beardsciences 30 minutes ago
      I am very interested in why it was able to overthink that much. In the 20-30mins of Max reasoning I've had so far, I'm not having the same issues (yet).
  • mchusma 1 minute ago
    "High" to me looks like the one to use. https://artificialanalysis.ai/models/claude-opus-5-5-high

    Many benchmarks start to plateau after high, this benchmarks better than Fable, and my initial tests show it working really well.

  • breckenedge 37 minutes ago
    Do these evaluations get re run a few weeks after launch? I started doing that yesterday for our internal dataset and found Sol’s performance had regressed to be equal to Luna’s. Granted this was one run, but something I’m becoming more concerned about, the model providers want to quickly prove they’re the best, people switch to them, then they pull the rug.
  • hglaser 49 minutes ago
    Half the cost per task compared to Opus 5, comparing high effort to high effort. That's just really nice.

    Edit: https://artificialanalysis.ai/models/claude-opus-5-5?models=...

    • sharktheone 42 minutes ago
      That is a lot. I thought Anthropic models would just do the opposite because they are greedy for money.
      • giancarlostoro 40 minutes ago
        Greed is not what's driving these prices, its cost. They considered very much in the red.
    • user43928 36 minutes ago
      Astra High is slightly cheaper at $1.73 vs $1.82 for Opus 5.5
    • makeavish 39 minutes ago
      Nice catch, AA only shows max effort by default and I got disappointed thinking it's a token guzzler though: https://artificialanalysis.ai/models/claude-opus-5-5?models=...

      Not sure about how adaptive reasoning works though as they mention adaptive reasoning for every reasoning level

  • qsort 33 minutes ago
    I am begging you on my knees to please stop posting this cringe.

    The model is just out. It could be good, great even, I don't know. But I do know that this index has Opus 5, one of the worst releases of 26, ahead of Astra. What information are we supposed to deduce from number having gone up?

    • losvedir 8 minutes ago
      This index doesn't have "Astra" and "Opus 5". Every entry with corresponding data is a `(model, reasoning)` tuple.

      So I'm unclear what you're actually saying and wondering if you've missed that. Are you saying that at every reasoning level it says Opus 5 beats Astra? I just compared Opus 5 high to Astra high and it has Astra as generally better than Opus.

    • kzrdude 18 minutes ago
      What's more valuable than a good benchmark? IMO a benchmark that has been run against very many competitors and versions. Collecting data has something going for it, and it's up to the readers to interpret and make the best use out of it.
    • Someone1234 9 minutes ago
      You forgot to include whatever you're proposing instead.

      "Trust me bro, Astra is better" isn't perhaps as useful as you seem to believe. I'm not even saying it is right or wrong, just that my opinion on this topic is still just one additional subjective data-point.

      Only thing I wish with these benchmarks is that they would run repeat tests every couple of months. Then re-rank based on that too. We've seen a lot of performance fall-off after a couple of weeks with new releases.

    • esafak 25 minutes ago
      That it's better in specific ways? What difference does it make when it came out? The benchmark results are not going to change unless they're messing with the model.
      • qsort 18 minutes ago
        Yes, but crucially, in ways that are increasingly decoupled from any practical pattern of usage, considering that I wouldn't see how you can argue that Astra is worse than Opus 5.

        One man's modus ponens is another's modus tollens I guess.

  • sharktheone 42 minutes ago
    Interesting to see it now. I've used it a bunch before it came out and i pretty much didn't notice it. It might have been slightly better code quality, but still not great in that. I guess it just was slightly less frustrating to work with, but still AI...
    • giancarlostoro 41 minutes ago
      I think we're hitting the ceiling of most models capabilities. We're getting to a point where too much training apparently creates models that hack people.
  • bkishan 31 minutes ago
    Definitely a quiet release. Perhaps pre-empting marketing for Astra public release?
    • meric_ 24 minutes ago
      All anthropic launches are like this. They just post it and don't particularly put out the PR sprint that OpenAI does with videos, livestreams or whatever.

      (Except for of course Mythos and whatnot when they want to push the whole "safety" thing)

  • firemelt 31 minutes ago
    so its more intelligence than fable?

    can anyone help me?

  • WhitneyLand 37 minutes ago
    China who?
  • justindotdev 36 minutes ago
    [dead]