Casey Meisenzahl

A Small Agent Benchmark

August 28, 2026

I tried Qwen3 using an open-source harness. It felt like it was 6โ€“12 months behind the frontier models, which is a pretty big difference.

I thought this might be an interesting benchmark: retrieve the BibTeX entry for a paper. In the first video, the open-source harness is on the left and Codex is on the right.

The frontier model finishes the job in about one minute. The open-source version needs follow-up prompts, encounters errors, and ultimately fails.

Open-source harness (left) and Codex (right).

I was able to finish the job manually in 30 seconds ๐Ÿ˜„

The same task done manually.