https://isomoes.github.io/en/blog Isomoes personal blog en-us jiahaoxiang2000@gmail.com (Isomoes) jiahaoxiang2000@gmail.com (Isomoes) Sat, 12 Sep 2026 00:00:00 GMT https://isomoes.github.io/en/blog/tools/model-harness-fit https://isomoes.github.io/en/blog/tools/model-harness-fit Why can the same GPT model stop midway, slow down, or struggle to finish a task in a different environment? Drawing on our experience with OpenCode and Codex, we examine how the harness affects availability and task performance, and how to choose a better fit. Sat, 12 Sep 2026 00:00:00 GMT jiahaoxiang2000@gmail.com (Isomoes) ai-agentharnesscodexopencodedeepseek-harnesstool-use