DeepSeek V4 Flash guide: try V4.1-Flash free, step by step
A frame-by-frame workthrough of AICodeKing's 7-minute video: pick V4.1-Flash in WorkBuddy's model picker while the free promo runs, brief a design-studio site, click through every interaction, then rebuild an analytics dashboard with a design skill and one precise fix pass.
The short version
- WorkBuddy serves DeepSeek V4.1-Flash with a “free now” label and a 0.00x credit multiplier during the two-week promotion — no DeepSeek API key needed on this route.
- The first build in the video, a fictional design-studio site called FORMA, came back as one self-contained index.html (~71 KB) previewed on 127.0.0.1:4173 with zero external requests.
- Interactions were tested on screen: category filters (All 8 · Branding 3 · Digital 3 · Spaces 2), a phone-width mobile menu, and a light/dark toggle that keeps the orange accents.
- The second build, a SIGNAL analytics dashboard, needed one fix pass for metric cards stacked down the left side — an installed design skill (Impeccable) drove the visual direction.
FULLY FREE Deepseek V4.1 Flash Coder: This SHOULDN'T BE FREE! (+My Design Workflow)
Screen recording:AICodeKing7:13
I Tested NEW Deepseek v4.1 Flash on 24 Coding Prompts
Benchmark facts:AI Coding Daily14:46
Frames are screenshots from the recording, used to illustrate original step-by-step instructions written for this page. Every step deep-links back to the exact moment in the video.
All footage © AICodeKing and AI Coding Daily. Watch the full videos on YouTube for the narration.
Try DeepSeek V4.1 Flash free: 13 steps from the video
- 1
Spot the launch: V4.1-Flash goes live
The video opens on the launch posts: WorkBuddy announcing that DeepSeek V4.1-Flash is live in its international app, and DeepSeek confirming the model is on the DeepSeek API with native multimodal support. The free angle is the hook — WorkBuddy advertises it as free to try for two weeks.
The launch posts that opened the free windowWatch at 0:16 - 2
Understand what “free” means here
WorkBuddy's promo card spells it out: DeepSeek-V4.1-Flash is free for two weeks on the international version. Inside the app the reviewer saw a “free now” label and a 0.00x credit multiplier during the offer. The general free plan's 100 monthly credits and 30-credit daily reward are separate allowances — and he could not verify an exact daily request cap, so treat zero-cost as promotional, not unlimited.
The promo card promising two free weeksWatch at 0:28 - 3
Select the model and confirm the free label
Setup takes a minute: get WorkBuddy's international app, sign in, open a new task, and click the model selector beside the message box. Pick Deepseek-V4.1-Flash and check the panel — the video shows a 0.00x consumption rate next to paid models like GPT-6-Astra at 6.67x, plus a note about free daily use with unlimited credits in the promo window. No API key configuration is needed for this route.
The model picker with V4.1-Flash at 0.00xWatch at 1:42 - 4
Write a brief with a concrete visual direction
The first task asks for a portfolio for a fictional design studio, FORMA: a warm ivory canvas, near-black oversized typography, burnt-orange accents, an inline-SVG architectural hero, a selected-work grid with working category filters (All, Branding, Digital, Spaces), a functioning mobile menu and a tasteful light/dark toggle — all in one self-contained index.html with no build step and no paid APIs. The completed card reports a single ~71 KB file, previewed locally on 127.0.0.1:4173 with zero external requests.
The full FORMA prompt and the single-file resultWatch at 2:08 - 5
Read the first render like a designer
The generated hero nails the brief: a huge serif headline — “Form follows feeling.” — with the last word in orange italics, an eyebrow reading “Independent design studio — est. 2019”, and an intro promising twelve projects a year. The reviewer's verdict: typography, colors and illustrations read like one studio, and the artwork is drawn as vectors in the page, so no stock images were needed.
The “Form follows feeling.” hero, straight from the promptWatch at 2:20 - 6
Click through the interactions
Next the video tests what the prompt promised. The work grid holds eight fictional projects; selecting Spaces cuts it to the two relevant cards and All brings everything back. WorkBuddy's own self-check table confirms the counts — All 8, Branding 3, Digital 3, Spaces 2 — with a staggered re-entry animation on filter changes.
Eight projects, four working filtersWatch at 1:16 - 7
Shrink to phone width and test the menu
At a phone-sized viewport the projects stack vertically and the header collapses to a hamburger plus a theme toggle. Opening the menu and choosing Services scrolls to the section and closes the drawer — the exact behaviour the prompt asked for, verified on screen rather than assumed.
Phone-width check: hamburger, toggle, sectionsWatch at 3:20 - 8
Open the artifact and the local preview
Everything the model wrote lands as an artifact: an index.html file chip in the chat, a “View all artifacts” link, and a “Start local preview server” status while a background task runs. The site you browse is the same single file the model saved — which is why it keeps working offline.
Artifact chip plus the running local previewWatch at 3:44 - 9
Second build: add a design skill to the brief
For a different style, the reviewer installs the Impeccable skill from WorkBuddy's Experts, Skills and Connectors panel, then starts a task that explicitly asks for it: a fictional creator analytics dashboard called SIGNAL in dark graphite with acid-lime accents, compact typography, a narrow sidebar, custom SVG charts, 7-day/30-day/90-day buttons and a table search — still one self-contained file, fictional data only.
The SIGNAL brief, pointed at the installed skillWatch at 4:08 - 10
Inspect the render before praising it
The first SIGNAL render looks close: a Performance view with 2.2M views, 213.4K watch-time hours and a 5:43 average view. But the video catches a real problem — the metric cards are stacked down the left side of a wide panel, leaving dead space on the right. This is the step where you zoom in instead of accepting the screenshot.
First render: right numbers, wrong layoutWatch at 4:32 - 11
Send one precise fix request
The fix goes back through chat: lay the four metrics out in a compact row, put the main chart underneath with the traffic breakdown beside it, and relabel the live badge as demo since the numbers are fictional. One pass later the layout is balanced — the stats row under the chart reads 2,242,059 views, 74.7K daily mean, 122.6K peak day, 15.8% volatility — and the demo label is fixed.
After one pass: metrics in a row, chart on topWatch at 4:48 - 12
Exercise the data controls
Range buttons actually work: switching 30 days to 7 days redraws the chart and swaps the numbers to 525.3K views. The traffic panel breaks down Browse & Home 32.6%, Suggested 31.4%, Search 14.8%, Subscriptions 11.2%, External 6.1% and Direct 3.9%, and typing in the table's filter box narrows the video list — the reviewer searches for one entry to confirm.
Ranges, traffic shares and the table filterWatch at 5:30 - 13
Flip the theme and do a final pass
The light toggle swaps the graphite panels for a pale background and darker green chart lines that stay readable — with a hover tooltip showing 115,780 views for Monday, Sep 7. The closing advice: give a specific project and visual direction, then open the result, click everything, and say exactly what to change. A design skill sharpens the output, but it never replaces looking at it.
Light theme on, tooltip working, doneWatch at 5:36