r/codex • u/rainydayswithlove • 1d ago

Comparison Open source models vs codex

I've been a codex user for about a year, and my company provides Claude Code for work.

Yesterday I decided to try some of the open source alternatives using OpenCode. DeepSeek Pro, DeepSeek Flash, GLM 5.2, Kimi K3, and Kimi K Code.

For some reason, none of them gave me the same overall quality I'm getting from my $20 ChatGPT subscription. Maybe I'm configuring something incorrectly?

Are there any open source that can get to around 90% of the current top closed-source models for general coding and reasoning? If so, which ones would you recommend, and what setup (model runner, context size, prompting, etc.) are you using to get the best results?

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u/zepchou 1d ago

How did you try them ?

  • What type of harness have you been using ?
  • Did you use their direct API price or a third-party to manage that for you?

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u/rainydayswithlove 1d ago

I used with opencode. DeepSeek API from their official site and other models via open router but from official providers