DeepSeek-V4 Pro coding analysis: Stable but weaker on Rust

zainhas · x · 2026-08-15

Supplemental benchmark data shows GPT-5.6 Sol leading in four languages including Python and Go, while Fable 5 dominates Rust with 85%. DeepSeek-V4 Pro did not win any language outright but remained stable without collapsing. Regarding failure modes, Sol causes the most test regressions (20%), while DeepSeek-V4 Pro and Fable are more conservative (11%), with DeepSeek mostly missing by a small margin.

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