Internal eval: DeepSeek V4.1 Flash nearly SOTA at 98% lower cost than Fable 5.1
himanshustwts · x · 2026-09-11
The author's team evaluated 11 frontier models on the same internal sample of 22 tasks spanning engineering, bizops, finance and healthcare:
- DeepSeek V4.1 Flash scored nearly SOTA on KnowledgeWork (15/21 passes) while being 98% cheaper than leader Fable 5.1 (18/22 passes).
- The biggest surprise was GPT-6 Astra, which passed only 11/22.
- Analysis of agent trajectories is just starting, with a full thread to follow.
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