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DeepSeek V4.1 Flash beats Haiku 5.5 on a Rust simulator task

A developer ran the same prompt and Rust loop plan on both models and found V4.1 Flash clearly better than Haiku 5.5, possibly bringing it back into their workflow.

Jeremy Chone
@jeremychoneArchived 12 days agoOriginally posted 2026.10.18
DeepSeek V4.1 Flash beats Haiku 5.5 on a Rust simulator task
Jeremy Chone @jeremychoneOriginally posted 2026.10.18
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hmm, same prompt, same #rust loop plan, deepseek v4.1 did much better than haiku 5.5 deepseek v4.1 flash below, then, restore ., and redid with haiku. Not definitive, but @deepseek_ai v4.1 might be back in my workflow. Use case: Adding full simulator / capture #rust

x.com/jeremychone/status/2111659960677646481Archived 2026.10.18 16:31