DeepSeek V4 Flash Matches GPT-5.6 Code Ability at 1/20th the Cost
donk8r · reddit · 2026-08-22
In a 50-case agent benchmark rebuilding open-source PRs, DeepSeek V4 Flash and GPT-5.6 Sol both passed 45 cases. However, DeepSeek cost only $1.59 total versus $33.61 for GPT-5.6, roughly a 20x cost advantage.
Note: Testing occurred on 2026-08-15, before DeepSeek raised prices.
Performance: GPT-5.6 had a median runtime of 2.3 minutes per case, while DeepSeek took 5-7 minutes. DeepSeek failed on one React hydration bug after 271 minutes, skewing the mean. Data is from the author's OctoBench and OctoMind agent.
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