Together AI· Inference platform

DeepSeek-V4 Flash 0731 vs GPT-5.6 Luna on DeepSWE: Cost and Coding

The post compares DeepSeek-V4 Flash 0731 and GPT-5.6 Luna on DeepSWE, showing that while GPT-5.6 Luna is more accurate, DeepSeek-V4 Flash is much cheaper, and a cascade strategy combining both outperforms Luna alone on accuracy and cost.

From the source

While GPT-5.6 Luna is the stronger engineer on every quality measure, DeepSeek-V4 Flash 0731 is cheap enough that a DeepSeek-first cascade beats Luna alone on both accuracy and cost.

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Announced

06 Aug 2026 00:00 UTC

Detected

07 Aug 2026 05:59 UTC (+29h after)

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