Abundant launches SWE-Marathon coding benchmark, where Claude Opus 4.8 leads frontier models with a 26% resolution rate
The long-horizon tasks include building Slack from scratch.
The long-horizon tasks include building Slack from scratch.
The long-horizon tasks include building Slack from scratch.
The long-horizon tasks include building Slack from scratch.

@bcherny I am having so much fun with 4.8 1m + goal + workflow on Ultracode. Amazing work these last few weeks by you guys
@alexgshaw Thank you!
Seeing a number of benchmarks showing Opus is the best model for long-running work. Five tips for running Opus autonomously for hours/days: 1. Use auto mode for permissions, so Claude doesn’t ask for approval 2. Use dynamic workflows, to have Claude orchestrate hundreds/thousands of agents to get a task done 3. Use /goal or /loop, to nudge Claude to keep going until it’s done 4. Use Claude Code in the cloud, so you can close your laptop (easiest way is the desktop or mobile app) 5. Make sure Claude has a way to self-verify its work end to end: Claude in Chrome browser extension for web, iOS/Android sim MCP for mobile, a way to start the full web server or service for backend work
Generally I feel more sympathy for OpenAI lately. Here they are, trying to RLVR towards actual scientific AGI that'll solve problems directly, as on CritPT. And their great safety-conscious competition: code, code, B2B, B2B, attack, exploit, chyna hawkery, RSI. Not equal. https://x.com/teortaxesTex/status/2063119416175272417/photo/1
Interesting. This validates my feeling that on a completely OOD SWE benchmark all open models flop. DeepSeek is way ahead of the pack and still merely on par with Gemini 3.1 (lol). Well at least it's not a psychotic reward hacker. …We'll have to deal with that part somehow. https://twitter.com/scaling01/status/2062989330637820085
Great tips. In practice, this is how it roughly looks to run agents autonomously for hours or days. /goal or /loop to keep it going. Verification is crucial here. https://x.com/omarsar0/status/2064010110314107372/photo/1 https://twitter.com/bcherny/status/2063792263067754658
Far be it from me to cheer for either Altman or Dario, I realize these are shades of evil. But they are different shades. This is a relatively worse timeline. https://x.com/teortaxesTex/status/2063422863420318151/photo/1 https://twitter.com/teortaxesTex/status/2063119416175272417
hmmm https://swe-marathon.vercel.app/#trajectory/rust-c-compiler-257 https://x.com/jayelmnop/status/2063010816127852829/photo/1 https://twitter.com/scaling01/status/2062989330637820085
you don't hate anthropic enough https://x.com/teortaxesTex/status/2063426455623667739/photo/1
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