DeepSeek V4.1 Flash hands-on tests and comparisons

Commentary noting that the US barred civilian agencies from DeepSeek products and China proposed pre-approval for frontier model exports in the same week DeepSeek released 552B-parameter V4.1 Flash under MIT.

Hands-on test of DeepSeek V4.1 Flash in llama.cpp using the Unsloth PR reached 31.6 tok/s, which the poster calls quite fast.

The author found that a web page can steer a DeepSeek-V4.1 agent without a jailbreak simply by quoting the model's own control tokens, and fixed it in the native engine running BLACKFOLD.

A user says DeepSeek V4.1 Flash easily hits 150+ tok/s versus OpenAI's 15–25 tok/s, arguing frontier models aren't needed for most work.

On a 100-task, 12-model board, DeepSeek V4.1 Flash running locally at EXL3 1.62bpw without thinking on one ASUS Ascent GX10 scored 5.37, topping the list and beating its cloud version's 5.01 by 0.36.

vLLM and Ant Group open-sourced JIT-quantized GEMM kernels called Humming, lifting V4.1 Flash throughput on 8x H20 by 14% at concurrency 1 and 43% at 64.

The poster calls DeepSeek-V4.1-Flash-1017 the best local model and releases a high-quality, fast MLX quantization for Apple Silicon.

The author says they increasingly code with DeepSeek V4.1 Flash and use OpenCode as their harness, calling it superior to Claude Code and praising the new sessions bar.

An MLX quantization for 256GB+ Macs claims 35–44% lower mean KL, 85.1% vs 79.3% top-1, zero experts pruned across all 40x384, with Engram tables streamed from SSD.

Third-party platform Roteo lists DeepSeek V4.1 Flash 1017 with 1M context at $0.23 input, $0.69 output and $0.0069 cached input per 1M tokens, claiming 23%/43%/8% below Venice's public API.

The author hooked DeepSeek V4.1 Flash into Wally to read Steam reviews and summarize what players are actually complaining about instead of scrolling through them.

The poster argues that DeepSeek V4.1 1017 run locally on a single DGX Spark is not the same model as the subscription version, since quants and recipes change output quality.