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  5. DeepSeek V4 FlashvsQwen3.5 Plus 2026-02-15
Updated Apr 2026

DeepSeek V4 FlashvsQwen3.5 Plus 2026-02-15

DeepSeek V4 Flash is cheaper than Qwen3.5 Plus 2026-02-15 at $0.14/M vs $0.4/M input tokens.

DeepSeek V4 Flash and Qwen3.5 Plus 2026-02-15 compared across 53 shared prompts
SpecDeepSeek V4 FlashQwen3.5 Plus 2026-02-15
Input price$0.14/M tokens$0.4/M tokens
Output price$0.28/M tokens$2.4/M tokens
Context window1.0M tokens1.0M tokens
WeightsOpenClosed
Free API (OpenRouter)NoNo
ReleasedApr 2026Feb 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 prompts both answered. Formatting stripped, words untouched.

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

DeepSeek V4 Flash442 words
LBO Model: HarborTech Services (HTS) – Base Case & Sensitivity Year-by-Year Financial Projections (FY2026–FY2030) ($ millions) FY2026 FY2027 FY2028 FY2029 FY2030 Revenue 972.00 1,040.04 1,102.44 1,157.56 1,215.44 EBITDA 136.08 156.01 176.39 191.00 206.63 Less: Cash Interest (64.80) (63.08) (60.08) (55.69) (50.16) –…
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Qwen3.5 Plus 2026-02-151,020 words
Transaction Setup & Sources/Uses (FY2025 Close) Entry Metrics: FY2025 EBITDA: $120m Purchase Price (EV): $120m × 12.0x = $1,440m Transaction Fees: $1,440m × 2.0% = $28.8m Total Uses: $1,468.8m Sources of Capital: Term Loan (4.0x): $120m × 4.0 = $480.0m Interest: 9.0% Cash + 1.0% Amortization Mezzanine (1.5x): $120m ×…
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Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

DeepSeek V4 Flash1,987 words
If the transistor had been invented in 1920—a full 27 years earlier—its impact would ripple through every layer of technology, economics, and geopolitics, fundamentally reshaping the 20th century. Below is a detailed tracing of first-, second-, and third-order effects through 1980, organized by domain.
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Qwen3.5 Plus 2026-02-151,313 words
This is a fascinating counterfactual scenario. To make this plausible, we must assume that the theoretical groundwork (quantum mechanics) and material science (purification of germanium/silicon) aligned roughly 25 years earlier than in our timeline, perhaps accelerated by a "Manhattan Project"-style urgency during WWI…
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Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

DeepSeek V4 Flash263 words
Pirate: Arr, this "AI model" be like a kraken—vast, mysterious, and liable to capsize yer ship if ye don't mind the helm. But who's trainin' the beast? Knight: Forsooth, I would call it a golem. Forged not of clay and incantations, but of numbers and cold lightning.
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Qwen3.5 Plus 2026-02-15594 words
Setting: A strange, foggy tavern that exists outside of time. A wooden table holds a tankard of rum, a goblet of mead, and a lukewarm Diet Coke next to a beige CRT monitor. Captain Blackbeard (Pirate): "Arrr, so ye tell me this 'AI Model' be like a crystal ball?
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Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

DeepSeek V4 Flash696 words
(Strolls to center stage, adjusts mic, gives a weary smile to the audience) Thank you. Thank you so much. That’s very kind. I’m glad you’re all here. Because I have some news. I have finally figured out adulthood. It happened about six months ago. I bought a house.
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Qwen3.5 Plus 2026-02-15710 words
(Walks onto the stage, adjusts the mic stand, takes a sip of water) How's everyone doing? Good? You look good. You look like people who have their lives together. Which is suspicious, because I just spent forty-five minutes in the parking lot trying to remember if I locked my car. I don't mean I forgot how to lock it.
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Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

DeepSeek V4 Flash1,977 words
Below is an analysis of each problematic clause in the Software Consulting Agreement, explaining why it is exploitative, suggesting specific modifications to protect the contractor, and providing the legal reasoning behind those changes.
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Qwen3.5 Plus 2026-02-151,697 words
This contract contains several highly unfavorable and potentially unenforceable clauses that heavily skew risk and power toward the Client while exposing the Contractor to significant financial and operational liability.
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Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

DeepSeek V4 Flash1,942 words
Failure Modes, Race Conditions, and Scaling Bottlenecks The described architecture has several critical flaws that compromise reliability, consistency, and scalability. Below is a systematic analysis with proposed solutions and their trade-offs.
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Qwen3.5 Plus 2026-02-151,351 words
This architecture contains several critical flaws that would prevent it from functioning as a reliable real-time collaborative editor. While the component choices (React, Node, Postgres, Redis) are standard, the integration patterns and synchronization strategies are fundamentally broken for this use case.
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Our Verdict
DeepSeek V4 Flash
DeepSeek V4 Flash
Qwen3.5 Plus 2026-02-15
Qwen3.5 Plus 2026-02-15

Not enough votes to call it. On the specs, nothing separates them.

DeepSeek V4 Flash costs 8.6x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

DeepSeek V4 Flash
Input
$0.14
2.9× cheaper
Output
$0.28
8.6× cheaper
Qwen3.5 Plus 2026-02-15
Input
$0.40
Output
$2.40

DeepSeek V4 Flash is cheaper on both: 2.9× input, 8.6× output.

Where to run it

18 hosts, cheapest first

DeepSeek V4 Flash17 hosts
HostInOutContextUptime
OOpenInferencefp8$0.05 in·$0.14 out·1M·100% upWWafer$0.07 in·$0.25 out·1M·99.9% upSStreamLakefp8$0.09 in·$0.18 out·1M·98.3% upDDeepInfrafp8$0.09 in·$0.18 out·1M·99.7% upGGMI Cloudfp8$0.09 in·$0.18 out·1M·99.9% upVVenice$0.10 in·$0.19 out·1M·99.7% up
11 more hostsFewer hosts
DDigitalOcean$0.10 in·$0.20 out·1M·100% upSSiliconFlowfp8$0.13 in·$0.28 out·1M·0% upAlibaba Cloudfp8$0.13 in·$0.27 out·1M·99.8% upAAtlasCloudfp4$0.14 in·$0.28 out·1M·100% upBaidu Qianfanfp8$0.14 in·$0.28 out·1M·99.2% upNNovitafp8$0.14 in·$0.28 out·1M·99.9% upPParasailfp8$0.14 in·$0.28 out·1M·99.7% upNNextBitfp8$0.15 in·$0.35 out·1M·100% upMMancerfp8$0.19 in·$0.50 out·1M·99.2% upPPhala$0.20 in·$0.40 out·1M·99.9% upAzure AI Foundry$0.21 in·$0.56 out·1M·96.3% up
Qwen3.5 Plus 2026-02-151 host
HostInOutContextUptime
Alibaba Cloud$0.26 in·$1.56 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
62%

Qwen3.5 Plus 2026-02-15 uses 10.0x more emoji

DeepSeek V4 Flash
Qwen3.5 Plus 2026-02-15
54%Vocabulary54%
17wSentence Length18w
0.52Hedging0.51
3.6Bold5.3
2.6Lists2.9
0.00Emoji0.10
0.41Headings0.75
0.19Transitions0.09
Based on 27 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

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Same lab, same size, long tail

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Model pages

DeepSeek V4 Flash logo
DeepSeek V4 Flash58 outputs, specs and price
Qwen3.5 Plus 2026-02-15 logo
Qwen3.5 Plus 2026-02-1553 outputs, specs and price
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