DeepSeek V4.1 Flash hands-on tests and comparisons

A roundup noting Codex Day 13 global quota reset and DeepSeek V4.1 Flash 1017 now live across web, app and API with stronger coding/agent performance and shorter outputs.

A user testing DeepSeek V4.1 Flash 1017 on the ivanfioravanti Metal fork says the model emits almost no prose and seems to think purely in tool calls.

DeepSeek's Oct 17 V4.1 Flash 1017 release ships open weights; OpenRouter offers a free 1M-context endpoint with rate limits, and official Search/Fetch calls made through Harness, Claude Code or Codex are free until Oct 31.

The author clarifies the fingerprint test only compares random-integer distributions over a closed candidate set with softmax normalization, so it says nothing about distillation and even varies day to day.

DeepSeek-V4.1-Flash ranks #1 among open models on Code Arena WebDev with 1670 points, #12 overall, ahead of Claude Opus 5 (High) and within ~10 points of GPT-6 Sol (Max), at roughly 1/10 Kimi K3's cost.

A Chinese post claims DeepSeek released a 763B-parameter Flash model generating around 200 tokens per second, while noting how fast model releases now come.

Arena confirms DeepSeek-V4.1-Flash-20261017 (Max) as the top open model on Code Arena WebDev, beating Kimi K3 (Max) at roughly 10x lower cost, with unchanged API usage and pricing.

The author used V4.1 Flash 1017 to build procedural modeling, GLSL shaders, a particle flow field, a six-chapter auto demo and an orbit camera, judging it above GPT but still behind Claude.

The author says DeepSeek V4.1 Flash-1017 produced a 3D scene similar to GPT-6 Astra's at $0.94 versus over $15, conceding Astra is more refined but far pricier.

Roundup of the 10/17 release: MIT weights on Hugging Face, 763B parameters, 1M recommended context, frozen API prices, self-reported DeepSWE 77.0 and Terminal-Bench 42.3, Search API at $0.75 per 1,000 calls billed from 10/31.

A user had DeepSeek V4.1 Flash 1017 generate a misty waterfall gorge with a river, foam and swaying pines in one prompt, taking 175.932s and 63,468 tokens for $0.03175672.

A report finds DeepSeek V4.1 Flash reaches a 97.3% cache hit rate, bringing real cost to about 6.2% of list price, making it a common pick paired with GLM 5.3 Flash for coding agents.