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Vibe Coding2026-09-23 · source-backed
Unreal Labs open-sourced it under MIT in Go. Each tool call is recorded as in-progress in the session log while the tool runs in the background, so the model never spends tokens waiting or polling. Same 57.9% pass rate as Codex at $1,428 against $2,350, and 65.8% on SWE-Atlas with GPT-6 Astra at $936 against $1,303. 1,413 stars the day after the September 21 release. All benchmark numbers are the vendor's own.
Each link below shares sources, entities, or timing with this story.
UC Berkeley's Sky Lab put seven models through Claude Code, Codex CLI and Pi on 30 sampled tasks each from SWE-bench Lite and Terminal-Bench 2.0, three attempts per task, 21 model-harness pairs total. HarnessTax is the result, from Melissa Pan, Ion Stoica, Matei Zaharia and co...
GitHub published Project HydraFusion on September 4. Spotify published Portal on September 3. CodeRabbit published its Astra evaluation on September 4. None of them coordinated, and all three are the same argument. HydraFusion is a Copilot research preview that treats workflow...
Martin Alderson's essay "The upcoming AI margin collapse, part 1: GLM 5.2" hit 675 points and 462 comments on Hacker News, and it's the rare HN chart-topper that's actually about spreadsheet math instead of vibes. The argument is simple. Z.ai's GLM 5.2 delivers frontier-adjace...
Every number you use to pick a harness comes from public repositories the models may have trained on. Specific Labs built the version that doesn't: tasks drawn from licensed private company codebases, including a 200K-user event app and a fintech processing over 100K bank stat...
This is the other half of the Fable 5 story, so read them together. While the best coding model in the world is uncallable, an open-weight one quietly posted frontier-adjacent numbers. Per Tom's Hardware, independent benchmarks for the MIT-licensed GLM-5.2 (744B params, 40B ac...
Terminal-Bench 2.1 results (entries dated June 17) put Codex CLI on GPT-5.5 first at 83.4%, Claude Code on Fable 5 second at 83.1%, and Claude Code on Opus 4.8 at 78.9%. The asterisk matters more than the ranking: Fable 5 and Mythos 5 have been export-suspended since June 12,...
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