Qwen3.8-Flash-Next vs Opus 5.5: Six-way benchmark on a real Rust feature with Claude Code and Pi
A few of you pointed out in my last post that comparing Flash-Next and Opus with different harnesses and effort levels wasn't fair.
Proof1 community thread
Key points
- Same task for every run: a real feature from the LlamaStash roadmap (save llama-server's KV cache before an unload and restore it when the model comes back).
- Flash-Next ran locally on my Strix Halo laptop (Flow Z13) via Halogen (~Q4 quant).
- Claude Code + Flash-Next, xhigh 5.38 (67%) 49.5 min $0.39 269k / 18.9M / 99k
- Flash-Next cost is at the QwenCloud price for Qwen3.8-Flash; I ran it locally, so it cost me only electricity.
Sources (1)
- [1]Qwen3.8-Flash-Next vs Opus 5.5: Six-way benchmark on a real Rust feature with Claude Code and Pir/LocalLLaMA (top, daily) · Oct 20, 02:40 PM
A few of you pointed out in my last post that comparing Flash-Next and Opus with different harnesses and effort levels wasn't fair.
Same task for every run: a real feature from the LlamaStash roadmap (save llama-server's KV cache before an unload and restore it when the model comes back).
Extractive summary: sentences quoted from the sources.
Before this
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- Oct 18, 2026Little Sweet Room Challenge | Strata Fork | Qwen 3.8 FN NVFP4 | DeepSeek Harness