DeepSeek V4.1 Flash 1017 Is INSANE! Best Open Model EVER?! (Fully Tested)

Summary
In this review video, the host of the channel WorldofAI reviews and benchmarks DeepSeek’s updated open-weights model, DeepSeek-V4.1-Flash-1017, released on October 17, 2026. The presenter analyzes its official benchmark improvements, pricing, and new Search and Fetch APIs, and showcases multiple hands-on coding tests ranging from full-stack web applications and interactive 3D WebGL assets to voxel game simulations against competitor models like Claude Opus 5.5, Gemini 4 Argon, GPT-6.1 Sol, and Kimi K3.

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What is shown

• Official Announcement & Benchmark Tables: Review of DeepSeek’s release tweet and documentation showing Pareto improvements across benchmarks, including Terminal-Bench 4.0 and Humanity’s Last Exam (HLE) [00:14–00:45, 03:02–03:49].
• DeepSeek Web Interface & API Integration: Demonstrating the chat UI with DeepThink enabled, as well as third-party harnesses like WorkBuddy AI and Codex [00:51–01:05, 02:15–02:40].
• Search & Fetch API Announcement: DeepSeek’s standalone search engine APIs priced at $0.75 per 1,000 calls (free for API users through October 31, 2026) [01:59–02:14].
• Leaderboard Placement: Showing the model ranked 11th overall on the World of AI leaderboard with an overall score of 64.0 [03:55–04:30].
• 3D Scene Evolution: Side-by-side comparison of a 3D rainy convenience store scene generated by the original DeepSeek-V4.1-Flash versus the 1017 update [06:24–06:53].
• Frontend Web Design: Interactive demonstrations of generated landing pages (“Solstice” and a bold color-blocked typography layout) [06:54–07:33].
• Interactive 3D Product Viewer: Testing a 360° interactive viewer for “Aura One” headphones, noting similarities in output formatting to OpenAI models [07:34–08:12].
• SVG & 2D Art Generations:
  • “Pelican riding a bike” SVG comparison among Gemini 4 Argon, GPT-6.1 Sol, Claude Opus 5.5, and DeepSeek-V4.1-Flash-1017 [08:40–09:23].
  • Pixel art landscape side-by-side against Gemini 4 Argon [17:32–18:16].
• Interactive 3D Characters & Simulations:
  • Animated 3D character generator comparison with Claude Opus 5.5 [09:24–10:14].
  • Massive voxel art simulation game (Seek Kingdom / The Siege of the Crown) featuring over 2 million voxels, pathfinding, and day/night controls [10:15–11:29].
  • Tesla Roadster stunt track WebGL animation compared to GPT-6 Luna [11:30–12:19].
  • First-person parkour mini-game HTML file comparison among DeepSeek-V4.1-Flash-1017, Claude Haiku 5.5, GPT-6 Luna, and Qwen 3.8 Flash [12:40–13:38].
  • “Infinite rail” celestial track test compared to GPT-6.1 Sol Ultra [14:28–15:32].
  • Realistic grassy hill with wind effects, dandelion particles, and procedural audio generated in a single turn using DeepSeek Harness [15:33–16:18].
  • Procedural Minecraft sandbox recreation compared to Moonshot’s Kimi K3 [16:19–17:31].
  • 3D Japanese garden pond scene compared with GPT-6 Astra [18:17–18:36].
  • Blender interior architectural scene generated via the Hermes agent framework [18:37–19:18].
  • 3D hardware presentation video for a Cerebras wafer-scale engine rack [19:19–19:40].

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Claims & numbers

• Benchmarks:
  • Terminal-Bench 4.0: DeepSeek-V4.1-Flash-1017 improved from 31.2% to 42.3%, surpassing GPT-5.6 Sol (39.9%) (presenter citing DeepSeek change log) [03:08–03:17].
  • DeepSWE v1.1: Scored 77.0%, beating GPT-5.6 Sol, Claude Opus 5, and GLM-5.3 [03:18–03:28].
  • Humanity’s Last Exam (HLE w/o tools): Improved from 36.8% to 42.6% [03:30–03:39].
• Inference Speed & Pricing:
  • Token generation speed hits approximately 244 tokens per second, with peak tests nearing 300 tokens per second [05:28–05:37].
  • API pricing is $0.30 per million input tokens and $1.20 per million output tokens, supporting a 1 million token context window [04:19–04:28].
  • Standalone Search & Fetch API is priced at $0.75 per 1,000 calls and is free via server-side tools through October 31, 2026, at 16:00 UTC [02:08–02:30].
• Task Cost & Time Comparisons:
  • 3D Animated Character test: DeepSeek cost $0.23 (took ~1 hour) vs. Claude Opus 5.5 costing $6.00 (took 20 minutes) [09:50–10:05].
  • Voxel game generation (Seek Kingdom): Generated over 2 million voxels in 25 minutes for ~$5.00 via API [10:44–10:54].
  • Stunt Car track: DeepSeek cost $0.89 vs. GPT-6 Luna at $1.07 [12:04–12:12].
  • First-person parkour game: DeepSeek generated the demo in ~1.5 hours for $0.14 vs. Claude Haiku 5.5 costing $0.08 in ~23 minutes [13:17–13:32].
  • Minecraft sandbox prompt: DeepSeek took ~1.5 hours and cost $0.80 vs. Kimi K3 taking ~2.5 hours and costing $35.00 [16:53–17:16].
  • Blender interior script: DeepSeek ran via Hermes agent for ~7 hours at a total cost of $1.83 [18:44–19:07].

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Notable quotes

• “Essentially, they’re calling this a Pareto improvement, meaning better performance at the same or lower cost.” [00:26]
• “It is something that reportedly hit about 244 tokens per second, with some early tests nearing 300 tokens per second, which is insane.” [05:28]
• “The output quality kind of mimics what OpenAI is generating... distillation may have played a role in its training.” [07:41 / 08:23]

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Assessment
This is a third-party review and benchmark demonstration video evaluating DeepSeek-V4.1-Flash-1017 across multiple coding and generation benchmarks. The presenter runs real tests and compiles community comparisons, acknowledging candidly where DeepSeek trails frontier models in completion speed or visual polish despite its cost-efficiency.

Described by gemini-3.8-flash on 2026-10-18 from the video’s audio and frames.