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Harness comparisonAI Coding

Eight parallel bug-fix sessions, two harnesses — Claude Code (Claude Opus 5.5) vs OpenAI Codex (GPT-6.1 Terra)

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Posted byStanislav Sorokin@stas_sorokin_ · on X
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Scoreboard2

  1. Claude Opus 5.5AnthropicClaude Code
    Time
    64 s
  2. GPT-6.1 TerraOpenAIOpenAI Codex
    Time
    61 s

Prompt

Eight parallel bug-fix sessions, two harnessesThe post doesn’t quote the prompt wording.

Claude Code (Claude Opus 5.5) and Codex (GPT-6.1 Terra) each run the same bug ticket in 8 sessions at once: 64 s for all 8 against 61 s.

Each side pairs a coding harness with its own model, so harness and model differences are mixed. More Claude Code vs OpenAI Codex. All harness comparisons.

The post, itemised

Task
Eight parallel bug-fix sessions, two harnesses
Category
Web/UI
Mode
Not stated
Posted
Video length
30 s
Likes
2
Views
1,183
Bookmarks
0
Sponsored
No

NotesThe video is an animated results summary; its chart has Claude Code fully fixing 5 of 8 sessions and Codex 7 of 8.

Related

Claude Opus 5.5GPT-6.1 TerraClaude Opus 5.5 vs GPT-6.1 Terra

Posted by @stas_sorokin_ on X. aivs.tv claims no ownership: it hosts a copy for fast playback and links to the post on X. Request removal

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