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Getting the most out of Opus 5.5 in Claude and Claude Code

232 points · 156 comments · saikatsg

  1. rdli · · focus · HN ↗
    It’s a really good model. Over the past few days, I give Opus some general directives to basically speed up our CI, and telling it I care both about billing minutes and wall clock time. I told it to create a plan after analyzing everything in our CI, run the plan by a Fable subagent, and then focus on low-risk, high-reward changes.

    9 hours later, I had 12 PRs ready to be merged, and the net result is CI time has dropped from ~10 minutes to ~4 minutes, and billing minutes have dropped around 60%. Less than an hour of my attention.

    1. chewchewchew · · focus · HN ↗
      9 hours?!
      1. rdli · · focus · HN ↗
        Yes. It spawned multiple subagents to run different experiments to benchmark a lot of different things, reviewed CI logs from past runs, etc. In the end, there were changes to what/how we cached, various code quality checks, speeding up test runners, and many other things.
        1. Tade0 · · focus · HN ↗
          I dare not ask about the cost, having burned $60 on a task running for 1h 16min once.
          1. rdli · · focus · HN ↗
            I’m on the $100/month subscription; this session took about $500 in token-equivalent costs.

            (Note that it wasn’t all Opus 5.5; I have a setup that uses Fable 5.1 as an advisor, Sonnet 5.5 for mechanical changes, etc.)

            1. atif089 · · focus · HN ↗
              Does it resume automatically on higher subscriptions?

              I'm on a $20 plan and it never auto resumes. I have to go back in and type out resume or click a button.

              1. Guillaume86 · · focus · HN ↗
                Instruct it to arm a monitor (every hour or so) to wake him up in case of quota or api issue.
                1. satvikpendem · · focus · HN ↗
                  Interesting how the French call Claude a "him" and not an "it", as French and many other languages don't have a word for a neuter pronoun.
                  1. Guillaume86 · · focus · HN ↗
                    Eh I know it's a miskate (used both here), but yeah it's a conscious effort for people at my level I guess.
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