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Harness comparisonAI Coding

One reef prompt in three labs’ agents — DeepSeek Harness (DeepSeek V4.1 Flash 1017) vs OpenAI Codex (GPT-6 Astra) vs Claude Code (Claude Fable 5.1)

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Posted byAgentSky@agentsky_dev · on X
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Scoreboard3

  1. DeepSeek V4.1 Flash 1017DeepSeekDeepSeek Harness
    Time
    6.5 min
    Cost
    $0.09
    • medium confidence
    • Written “DeepSeek V4.1 Flash” after the 1017 update shipped; read as V4.1 Flash 1017.
  2. GPT-6 AstraOpenAIOpenAI Codex
    Time
    2.1 min
    Cost
    $0.43
  3. Claude Fable 5.1AnthropicClaude Code
    Time
    12 min
    Cost
    $6.00

Prompt

One reef prompt in three labs’ agentsThe post doesn’t quote the prompt wording.

DeepSeek V4.1 Flash 1017 in DeepSeek Harness, GPT-6 Astra in Codex and Claude Fable 5.1 in Claude Code get the same reef prompt, one run each.

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

The post, itemised

Task
One reef prompt in three labs’ agents
Category
3D & Shaders
Mode
Not stated
Posted
Video length
16 s
Likes
0
Views
70
Bookmarks
0
Sponsored
No

NotesNo winner named; the author asks which reef you would ship. The video doesn’t label the panels.

Cost & time, as stated in the postAs stated: DeepSeek V4.1 Flash 1017 in DeepSeek Harness 6 min 32 s, $0.09; GPT-6 Astra in Codex 2 min 7 s, $0.43; Claude Fable 5.1 in Claude Code 12 min, $6.00.

Related

DeepSeek V4.1 Flash 1017GPT-6 AstraClaude Fable 5.1Compare all 3 modelsClaude Fable 5.1 vs DeepSeek V4.1 Flash 1017Claude Fable 5.1 vs GPT-6 AstraDeepSeek V4.1 Flash 1017 vs GPT-6 Astra

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