Codex vs DeepSeek Harness: The 2027 Developer’s Choice (150 Benchmark Results)
1 months ago 高效码农Codex vs DeepSeek Harness: I Read Both Source Codes and Ran 150 Benchmarks So You Don’t Have To Two things happened in August 2026. OpenAI open-sourced the harness that powers Codex under Apache-2.0. DeepSeek released dsh v0.1 under MIT. Then the comparison articles started rolling in. The consensus was nearly identical across the board: Codex has a mature ecosystem, DeepSeek Harness is more flexible with its plugin architecture. That statement isn’t wrong. But it doesn’t help you make a decision. So I did the tedious thing. I pulled both codebases locally and read them line by line. Codex locked …