157 pointsby myahio4 hours ago17 comments
  • pvalue005an hour ago
    I suspect this was released by Anthropic as a DDOS attack on other AI companies. I prompted 'how do we solve this challenge?' into gemini cli in a cloned repo and it's been running non-stop for 20 minutes :)
  • bytesandbits8 minutes ago
    Having done a bunch of take home for big (and small) AI labs during interviews, this is the 2nd most interesting one I have seen so far.
  • avaer2 hours ago
    It's pretty interesting how close this assignment looks to demoscene [1] golf [2].

    [1] https://en.wikipedia.org/wiki/Demoscene [2] https://en.wikipedia.org/wiki/Code_golf

    It even uses Chrome tracing tools for profiling, which is pretty cool: https://github.com/anthropics/original_performance_takehome/...

    • nice_bytean hour ago
      it's designed to select for people who can be trusted to manually write ptx :-)
  • sureglymopan hour ago
    Having recently learned more about SIMD, PTX and optimization techniques, this is a nice little challenge to learn even more.

    As a take home assignment though I would have failed as I would have probably taken 2 hours to just sketch out ideas and more on my tablet while reading the code before even changing it.

  • NitpickLawyeran hour ago
    The writing was on the wall for about half a year (publicly) now. The oAI 2nd place at the atcoder world championship competition was the first one, and I remember it being dismissed at the time. Sakana also got 1st place in another atcoder competition a few weeks ago. Google also released a blog a few months back on gemini 2.5 netting them 1% reduction in training time on real-world tasks by optimising kernels.

    If the models get a good feedback loop + easy (cheap) verification, they get to bang their tokens against the wall until they find a better solution.

  • Maroan hour ago
    > This repo contains a version of Anthropic's original performance take-home, before Claude Opus 4.5 started doing better than humans given only 2 hours.

    Was the screening format here that this problem was sent out, and candidates had to reply with a solution within 2 hours?

    Or, are they just saying that the latest frontier coding models do better in 2 hours than human candidates have done in the past in multiple days?

  • Incipient6 minutes ago
    >so we can be appropriately impressed and perhaps discuss interviewing.

    Something comes across really badly here for me. Some weird mix of bragging, mocking, with a hint of aloof.

    I feel these top end companies like the smell of their own farts and would be an insufferable place to work. This does nothing but reinforce it for some reason.

  • kristianpaulan hour ago
    “If you optimize below 1487 cycles, beating Claude Opus 4.5's best performance at launch, email us at performance-recruiting@anthropic.com with your code (and ideally a resume) so we can be appropriately impressed and perhaps discuss interviewing.”
    • afro8814 minutes ago
      > at launch

      Does this confirm they actually do knee cap models after the launch period to save money, without telling users?

      • mediaman5 minutes ago
        No, they later updated the harness for this and it subsequently got better scores.
  • tayo4215 minutes ago
    I wonder if the Ai is doing anything novel? Or if it's like a brute force search of applying all types of existing optimizations that already exist and have been written about.
  • dhruv300644 minutes ago
    I wonder if OpenAI follows suit.
    • rvz25 minutes ago
      They should.
  • mips_avatar2 hours ago
    Going through the assignment now. Man it’s really hard to pack the vectors right
  • greesil2 hours ago
    This is a knowledge test of GPU architecture?
    • avaeran hour ago
      Kind of, but not any particular GPU.

      The machine is fake and simulated: https://github.com/anthropics/original_performance_takehome/...

      But presumably similar principles apply.

    • benreesman15 minutes ago
      It's a test of polyhedral layout algebra, what NVIDIA calls CuTe and the forthcoming C++ standard calls std::mdspan.

      This is the general framework for reasoning about correct memory addressing in the presence of arbitrary constraints like those of hardware.

  • tucnakan hour ago
    The snarky writing of "if you beat our best solution, send us an email and MAYBE we think about interviewing you" is really something, innit?
    • riffraff33 minutes ago
      I feel that came out wrong but the "maybe" was intended to be a way of saying "no guarantees", to avoid giving people the idea "solve this, get hired".
      • Bootvis10 minutes ago
        Should have asked Claude how to write it better.
    • ahussain38 minutes ago
      They wrote:

      > If you optimize below 1487 cycles, beating Claude Opus 4.5's best performance at launch, email us at performance-recruiting@anthropic.com with your code (and ideally a resume) so we can be appropriately impressed and perhaps discuss interviewing.

      That doesn’t seem snarky to me. They said if you beat Opus, not their best solution. Removing “perhaps” (i.e. MAYBE) would be worse since that assumes everyone wants to interview at Anthropic. I guess they could have been friendlier: “if you beat X, we’d love to chat!”

      • 0x3f36 minutes ago
        I suppose you could interpret it either way, but having dealt with their interview pipeline I'd choose the snark.
        • 26 minutes ago
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      • lovich35 minutes ago
        That paraphrases to

        "do better than we have publicly admitted most of humanity can do, and we may deign to interview you"

        It sounds incredibly condescending, if not snarky, but I would classify those adjectives as mostly synonymous.

        • throwaway74324 minutes ago
          I took the "perhaps" as a decision to be considered by the applicant, considering they'd be competent enough to get in at a place of their choice, not just anthropic.
          • lovich21 minutes ago
            Does the applicant or the employer decide if an interview happens in your experience?

            Do you think if the applicants are really in that level of demand that they would be getting a take home test instead of being actively recruited?

            Legitimately lay out your understanding of a world where an employer is chasing after employees who are high in demand, give them a test that is expected to take hours, and have a hedged bet in their wording, instead of saying we will absolutely hire you if you pass X bar?

    • kristopolous35 minutes ago
      If you're an asshole that wants millions of dollars...i mean there's still places to say no
    • sourcegriftan hour ago
      Pride comes before fall thankfully
    • altmanaltmanan hour ago
      its anthrophic. their entire marketing is just being an pompous ass and AI fear mongering.
  • myahio4 hours ago
    [flagged]
  • zeroCalories2 hours ago
    It shocks me that anyone supposedly good enough for anthropic would subject themselves to such a one sided waste of time.
    • pclmulqdqan hour ago
      I generally have a policy of "over 4 hours and I charge for my time." I did this in the 4-hour window, and it was a lot of fun. Much better than many other take-home assignments.
      • heavyset_goan hour ago
        I don't do take home assignments, but when I did, I would offer to do it at my hourly rate, even if it was just an hour. It's time I would otherwise spend making money.

        Anyone worth working with respected that and I landed several clients who forwent the assignment altogether. It's chump change in the grand scheme of things, and often a formality.

        Does help that I have a very public web presence and portfolio, though.

        • theptipan hour ago
          For many reasons, you’re not gonna get into Anthropic with that attitude.
          • PlanksVariable27 minutes ago
            And Anthropic will never land heavyset_go with their attitude. I guess we’re at an impasse.
        • dheera13 minutes ago
          Time is the issue, not money.

          I couldn't care less about getting paid for a few hours, what's truly annoying when you're job hunting is the company having an extremely high rejection rate even at the take-home stage. That's an inordinate waste of time multiplied by a lot of companies.

          If you have a >50% chance of rejecting, don't even give the candidate a take-home. Be at least 90% sure you want them before you get to that stage.

      • whateveracctan hour ago
        4 hours continuous or no? I can't imagine finding 4 hours of straight focus.
        • ryanjshaw17 minutes ago
          These kinds of roles are for youngsters with minimal commitments who are looking for their shot to break into a wild industry. It’s not for the middle aged single parent with FTE and just enough free time to do an extra load of laundry.
    • browningstreetan hour ago
      I’ve been sent the Anthropic interview assignments a few times. I’m not a developer so I don’t bother. At least at the time they didn’t seem to have technical but not-dev screenings. Maybe they do now.
      • throwa3562624 minutes ago
        Care to elaborate the first part?

        Did you apply for a position? Did they send you the assignment without prior discussion?

    • sealeckan hour ago
      Why is writing code to execute a program using the fewest instructions possible on a virtual machine a waste of time?
      • 0x3f35 minutes ago
        The expected time you spend on it is much less than the expected time they'll spend on it.
    • mips_avataran hour ago
      It’s kind of an interesting problem.
  • koolba2 hours ago
    What is the actual assignment here?

    The README only gives numbers without any information on what you’re supposed to do or how you are rated.

    • glalonde2 hours ago
      "Optimize the kernel (in KernelBuilder.build_kernel) as much as possible in the available time, as measured by test_kernel_cycles on a frozen separate copy of the simulator." from perf_takehome.py
    • vermilingua2 hours ago
      Think that means you failed :(
      • nice_byte2 hours ago
        +1

        being cryptic and poorly specified is part of the assignment

        just like real code

        in fact, it's _still_ better documented an self contained than most of the problems you'd usually encounter in the wild. pulling on a thread to end up with a clear picture of what needs to be accomplished is like 90% of the job very often.

        • throwaway81523an hour ago
          I didn't see much cryptic except having to click on "perf_takehome.py" without being told to. But, 2 hours didn't seem like much to bring the sample code into some kind of test environment, debug it enough to works out details of its behaviour, read through the reference kernel and get some idea of what the algorithm is doing, read through the simulator to understand the VM instruction set, understand the test harness enough to see how the parallelism works, re-code the algorithm in the VM's machine language while iterating performance tweaks and running simulations, etc.

          Basically it's a long enough problem that I'd be annoyed at being asked to do it at home for free, if what I wanted from that was a shot at an interview. If I had time on my hands though, it's something I could see trying for fun.

          • tayo4217 minutes ago
            2 hours does seem short. It took me a half hour to get through all you listed and figure out how to get the valu instruction working.

            I suspect it would take me another hour to get it implemented. Leaving 30 minutes to figure out something clever?

            Idk maybe I'm slow or really not qualified.

          • nice_byte28 minutes ago
            it's "cryptic" for an interview problem. e.g. the fact that you have to actually look at the vm implementation instead of having the full documentation of the instruction set from the get go.
            • throwaway815232 minutes ago
              That seems normal for an interview problem. They put you in front of some already-written code and you have to fix a bug or implement a feature. I've done tons of those in live interviews. So that part didn't bother me. It's mostly the rather large effort cost in the case where the person is a job applicant, vs an unknown and maybe quite low chance of getting hired.

              With a live interview, you get past a phone screening, and now the company is investing significant resources in the day or so of engineering time it takes to have people interview you. They won't do that unless they have a serious level of interest in you. The take-home means no investment for the company so there's a huge imbalance.

              There's another thread about this article, which explains an analogous situation about being asked to read AI slop: https://zanlib.dev/blog/reliable-signals-of-honest-intent/

        • avaeran hour ago
          It's definitely cleaner than what you will see in the real world. Research-quality repositories written in partial Chinese with key dependencies missing are common.

          IMO the assignment('s purpose) could be improved by making the code significantly worse. Then you're testing the important stuff (dealing with ambiguity) that the AI can't do so well. Probably the reason they didn't do that is because it would make evaluation harder + more costly.

    • 2 hours ago
      undefined
  • jackblemming2 hours ago
    Seems like they’re trying to hire nerds who know a lot about hardware or compiler optimizations. That will only get you so far. I guess hiring for creativity is a lot harder.

    And before some smart aleck says you can be creative on these types of optimization problems: not in two hours, it’s far too risky vs regurgitating some standard set of tried and true algos.

    • tmule2 hours ago
      Your comments history suggests you’re rather bitter about “nerds” who are likely a few standard deviations smarter than you (Anthropic OG team, Jeff Dean, proof nerds, Linus, …)
      • jackblemmingan hour ago
        And they’re all dumber than John von Neumann, who cares?
        • margalabargalaan hour ago
          Transitively, you haven't thought the most thoughts or cared the most about anything, therefore we should disregard what you think and care about?
          • jackblemmingan hour ago
            The person replying was trying to turn the conversation into some sort of IQ pissing contest. Not sure why, that seems like their own problem. I was reminding them that there is always someone smarter.
    • muglug2 hours ago
      If they're hiring performance engineers then they're hiring for exactly these sets of skills.

      It's a take-home test, which means some people will spend more than a couple of hours on it to get the answer really good. They would have gone after those people in particular.

    • onion2kan hour ago
      And before some smart aleck says you can be creative on these types of optimization problems: not in two hours, it’s far too risky vs regurgitating some standard set of tried and true algos.

      You're both right and wrong. You're right in the sense that the sort of creativity the task is looking for isn't really possible in two hours. That's something that takes a lot of time and effort over years to be able to do. You're wrong because that's exactly the point. Being able to solve the problem takes experience. Literally. It's having tackled these sorts of problems over and over in the past until you can draw on that understanding and knowledge reasonably quickly. The test is meant to filter out people who can't do it.

      I also think it's possible to interpret the README as saying humans can't do better than the optimizations that Claude does when Claude spends two hours of compute time, regardless of how long the human takes. It's not clear though. Maybe Claude didn't write the README.

    • Analemma_2 hours ago
      This would be an inappropriate assignment for a web dev position, but I'm willing to bet that a 1% improvement in cycles per byte in inference (or whatever) saves Anthropic many millions of dollars. This is one case where the whiteboard assignment is clearly related to the actual job duties.
    • rvz2 hours ago
      > Seems like they’re trying to hire nerds who know a lot about hardware or compiler optimizations. That will only get you so far. I guess hiring for creativity is a lot harder.

      Good. That should be the minimum requirement.

      Not another Next.js web app take home project.