DeepSeek V4.1 Flash hands-on tests and comparisons

A user shares a hermes agent setup on minirouters with Kimi K3.1 Pro as orchestrator and DeepSeek V4.1 Flash 1017 as subagents, calling it a killer coding stack.

A user says consensus favors DeepSeek V4.1 Flash over GLM 5.3 Flash Abliterated for the task, but asks whether the quantized build running on 2x Spark is nerfed and requests evals.

Same-task comparison: Opus 5.5 in Claude Code 61.7 at $11.42, GPT-6.1 Sol in Codex 54.1 at $1.50, DeepSeek V4.1 Flash in Codex 47.3 at $0.39.

Fireworks' own test reports 1521 tokens per second, about 7x faster than Claude Opus 5.5, with Tetris code emitted almost in one burst.

A user notes OpenCode had long made DeepSeek V4.1 Flash and GLM 5.3 Flash free, so a Kimi K3.1 Pro 'now available' notice looked free at first glance.

The author says K3.1 Pro has worse taste, colors and 3D builds than K3, calls its benchmarks inflated, and would pick the cheaper, faster, more fun DeepSeek V4.1 Flash every time.

The author found DeepSeek V4.1 Flash very proficient at coding on VulcanBench Frontier v4, and says its Artificial Analysis results suggest serious cybersecurity ability too, as the Cyber Index grows in importance.

EvoLink ran the same code-only 3D campfire prompt on both models; DeepSeek V4.1 Flash 1017 cost $0.33 in about 3h12m, beating MiniMax M3.1 Flash on both cost and time.

Qoder says the model runs at 0.0x credits until Oct 24, with the community expecting 0.1x after; OpenCode Zen lists it as deepseek-v4.1-flash-free with no stated end date.

On RuneScape Bench, Kimi 3.1 Pro is priced like Argon but scores similarly to DeepSeek V4.1 Flash, roughly matching Opus 5.0 from three months ago.

Given a full 2D spaceship game spec, a user let V4.1 Flash autonomously handle Godot/GDScript coding and Blender modeling via MCP for hours, with impressive early results.

On OpenRouter's Codex usage ranking, DeepSeek V4.1 Flash places second behind Luna, with the rest of the top seven all GPT models.