J-Space harness boosts DeepSeek V4 Pro benchmarks significantly
ccerrato147 · x · 2026-08-18
A developer combined DeepSeek V4 Pro 0813 with a harness called J-Space, reportedly reducing errors in extended reasoning and tool-use. Benchmarks show significant gains: Terminal Bench (87.9→90.1), NL2Repo (61.5→73.4), CyberGym (83.3→86.8), DeepSWE (62.7→72.0), and Toolathlon (74.1→79.5). The combination outperforms Fable 5 and Opus 4.8 on several agentic and coding benchmarks.
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