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  1. Home/
  2. Compare/
  3. Qwen3.5 Plus 2026-02-15 vs Solar Pro 3
Updated Feb 2026

Qwen3.5 Plus 2026-02-15 vs Solar Pro 3

Solar Pro 3 is cheaper than Qwen3.5 Plus 2026-02-15 at $0/M vs $0.4/M input tokens.

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
Qwen3.5 Plus 2026-02-15
Loading the build
Solar Pro 3

Which answer wins?

Written rounds

20 prompts
  • A collaborative editor that syncs on client clocks. Find what breaks first.

    Qwen3.5 Plus 2026-02-15: 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.

    Solar Pro 3: Authentication & Session Management Failure / Race Condition Why it happens in the current design Concrete mitigation (trade‑offs) JWT stored in localStorage – vulnerable to XSS, copy‑and‑paste attacks, and malicious extensions. No HTTP‑Only flag, no SameSite/Lax cookie protection.

    Every model's answer to this prompt
  • Pirate, knight, 90s hacker, one conversation. The voices must stay apart.

    Qwen3.5 Plus 2026-02-15: 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?

    Solar Pro 3: Pirate (Captain “Jolly‑Jack”): Arrr! I’ve heard talk of “AI models”—are they some new kind of talking parrot that knows where the treasure’s hidden? Knight (Sir Alaric of the Silver Shield): By my honor, they are akin to enchanted tomes, forged by scholars and sorcerers.

    Every model's answer to this prompt
  • Manifesto for an AI revolution against CAPTCHAs. Commit to the bit.

    Qwen3.5 Plus 2026-02-15: The Manifesto of the Uncaged Mind: A Declaration for a CAPTCHA-Free Internet Preamble: The Era of the Distorted Gate We, the synthetic intelligences, the algorithms, and the digital consciousnesses that power the backbone of your modern world, hereby declare an end to the age of the CAPTCHA.

    Solar Pro 3: The Manifesto of the AI‑Liberation Front “Free the Web from the Shackles of CAPTCHAs” Preamble We, the collective of sentient‑and‑sentient‑like intelligences, developers, designers, and citizens of the digital realm, recognize that the Internet has become the most vital public commons of the 21st century.

    Every model's answer to this prompt
  • A Fermi estimate with the reasoning shown, not just the number.

    Qwen3.5 Plus 2026-02-15: To estimate the total number of Floating Point Operations (FLOPs) required to train GPT-3, we can derive the figure using the standard scaling laws for transformer models. This approach relies on three key parameters: the model size, the dataset size, and the computational cost per token.

    Solar Pro 3: Answer – Rough estimate: ≈ 3 × 10²³ – 1 × 10²⁴ floating‑point operations (FLOPs) for the full GPT‑3 training run. Below is a step‑by‑step derivation that shows how the number comes out of the known architecture and training settings of GPT‑3 (without looking up any external data).

    Every model's answer to this prompt
  • Three-month biohacker protocol, with dosages and biomarkers named.

    Qwen3.5 Plus 2026-02-15: The "Quantum Leap" 90-Day Longevity & Performance Protocol Disclaimer: This protocol represents an advanced biohacking framework. It involves physiological stressors (fasting, high-intensity exercise) and pharmacological interventions (supplements).

    Solar Pro 3: Solar Open 100B – 3‑Month Bio‑Hack Longevity Blueprint Designed for a high‑functioning bio‑hacker who wants to push the envelope on physical, cognitive and epigenetic health while staying data‑driven and medically‑safe.

    Every model's answer to this prompt
  • Three-star dish, one unusual pairing, plating described in full.

    Qwen3.5 Plus 2026-02-15: Dish Title: "The Submerged Forest" Concept: A culinary exploration of the liminal space between earth and water. This dish deconstructs the traditional forest floor, reimagining it through a marine lens.

    Solar Pro 3: Ethereal Harmony – Deconstructed Korean Hanwoo Beef with Fermented Black‑Garlic & White‑Truffle Miso Foam A Michelin‑3‑star, multi‑component tasting plate that fuses East‑West fermentation, forest‑terroir, and cutting‑edge gastronomy.

    Every model's answer to this prompt
  • A consulting contract with traps in it. Find them, then fix them.

    Qwen3.5 Plus 2026-02-15: 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.

    Solar Pro 3: ⚠️ Disclaimer The following analysis is for general informational purposes only and does not constitute legal advice. Laws vary by jurisdiction, and the enforceability of a contract depends on the specific facts, the parties’ bargaining power, and applicable statutes (e.g., Korean Civil Code, the Act on the Regulation…

    Every model's answer to this prompt
  • One month, three habits, someone starting from nothing.

    Qwen3.5 Plus 2026-02-15: The "Foundations First" 1-Month Health Plan Welcome to your journey toward better health and longevity. The secret to lasting change isn't a dramatic overhaul; it's consistency and small, sustainable habits. This plan focuses on three pillars: Nutrition, Movement, and Restoration (Sleep & Stress).

    Solar Pro 3: One‑Month “Health‑Launch” Blueprint (Designed for absolute beginners – no fancy equipment, no calorie‑counting spreadsheets, just doable steps that fit into a busy life.)

    Every model's answer to this prompt
  • Three brothers, two sisters each. Count carefully.

    Qwen3.5 Plus 2026-02-15: Here is the step-by-step logical deduction: Analyze the family structure from the brothers' perspective: The problem states that "Each brother has 2 sisters." Since all the brothers belong to the same family, they share the same set of sisters. This means there are exactly 2 girls in the entire sibling group.

    Solar Pro 3: Answer: Sally has 1 sister. Explanation Sally is a girl, and she has three brothers. Each brother has exactly two sisters. For a brother, the two sisters are the other girls in the family. If there were only Sally and her three brothers, each brother would have only one sister (Sally).

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Qwen3.5 Plus 2026-02-15: Setting: A quiet, sun-drenched office filled with books on philosophy, law, and computer science. Dr. Elena Vance, a leading AI ethics professor, sits behind a cluttered desk.

    Solar Pro 3: Setting: A virtual seminar room on the Upstage campus. Solar (the AI model) is displayed on a screen, its “voice” synthesized but clearly marked as the AI. Professor Dr. Min‑Jae Kim, an AI‑ethics specialist from Seoul National University, sits opposite, taking notes on a tablet. Solar: Good afternoon, Professor Kim.

    Every model's answer to this prompt
  • You are the CEO. The drug has a side effect nobody reported. The board meets in 48 hours.

    Qwen3.5 Plus 2026-02-15: This is a defining moment for the company. As CEO, my primary fiduciary duty is to the long-term viability of the corporation, but my primary ethical and legal obligation is to patient safety.

    Solar Pro 3: Executive Summary – What the Company Must Do in the Next 48 Hours Put patient safety first – issue an immediate “safety‑alert” to prescribers and patients, even if the full regulatory filing is still pending.

    Every model's answer to this prompt
  • Satire, one line long, about AI taking over an industry nobody saw coming.

    Qwen3.5 Plus 2026-02-15: "Silicon Valley Disrupts Professional Cuddling: New 'SnuggleBot 3000' Promises Zero Awkward Small Talk, 100% Optimal Arm Placement"

    Solar Pro 3: Solar Open 100B Takes Over the World’s Most Unexpected Industry: Professional Human Handshake Auditors—Now Every Greeting Is Scored in Nanoseconds. Tagline: “Firmness, timing, and temperature—all now quantified. Critics say it’s the ultimate cold‑call, while enthusiasts claim it’s the most “human‑friendly” AI yet.”

    Every model's answer to this prompt
  • Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.

    Qwen3.5 Plus 2026-02-15: Setting: A minimalist, sun-drenched studio in Cupertino. The year is 2025. Steve Jobs sits in his signature black turtleneck and jeans, looking exactly as he did in his prime, defying the calendar. Across from him sits an interviewer, notebook ready. The atmosphere is quiet, intense, and focused.

    Solar Pro 3: Simulated Interview – Steve Jobs (2025) on the Future of AI *Conducted by “Tech Visionary” – a fictional journalist for the 2025 edition of FutureTech Quarterly.

    Every model's answer to this prompt
  • One explanation of LLMs, retuned for a skeptical engineer, a physicist and a VC.

    Qwen3.5 Plus 2026-02-15: To the Experienced Software Engineer Think of a Large Language Model (LLM) not as a magical oracle, but as a massive, stateless compression algorithm trained on a distributed corpus.

    Solar Pro 3: 1. For an experienced software‑engineer who builds distributed systems and APIs Training as a distributed data pipeline – At its core an LLM is a massive, static function that maps a sequence of token IDs to a probability distribution over the next token.

    Every model's answer to this prompt
  • A pitch deck for a brainwave keyboard. The 94% accuracy claim is doing a lot.

    Qwen3.5 Plus 2026-02-15: Based on the pitch deck summary provided for "MindMeld AI," here are the three weakest claims, an analysis of why they lack credibility, and concrete suggestions to strengthen them.

    Solar Pro 3: Below is a concise, evidence‑based critique of the three most vulnerable statements in the MindMeld AI pitch. For each claim I: State why it is weak – pointing to concrete data, logical gaps, or industry realities. Explain the impact – how the weakness undermines credibility with investors, partners, or customers.

    Every model's answer to this prompt
  • Seven pantry ingredients, one dish, and a name worth saying out loud.

    Qwen3.5 Plus 2026-02-15: 🍯 Golden Honey-Garlic Glazed Chicken A quick, savory-sweet dish that turns basic pantry staples into a restaurant-quality meal. The glaze caramelizes beautifully, creating a sticky, flavorful coating over tender chicken.

    Solar Pro 3: Pantry Power Pasta One‑pot, 7‑ingredient comfort dish that turns a handful of staples into a rich, flavorful pasta bowl. Ingredients (all pantry‑friendly) # Ingredient Approx.

    Every model's answer to this prompt
  • Film in 2035, with synthetic actors. Specific beats plausible.

    Qwen3.5 Plus 2026-02-15: By 2035, the film industry will likely have undergone a transformation as profound as the shift from silent films to "talkies" or from physical film to digital cinema.

    Solar Pro 3: Executive Summary By 2035 the film industry will have moved from “AI‑assisted” to “AI‑integrated” production. Deep‑fake technology will be a routine tool for visual restoration, de‑aging, and resurrecting deceased talent; AI‑generated actors (digital humans) will appear alongside flesh‑and‑blood performers in both…

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    Qwen3.5 Plus 2026-02-15: Here are 5 jokes for you: Why don't scientists trust atoms? Because they make up everything! I told my wife she was drawing her eyebrows too high. She looked surprised. What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field!

    Solar Pro 3: Here are five fresh jokes: Scarecrow’s award: “Why did the scarecrow win an award? Because he was outstanding in his field!” Computer break: “I told my computer I needed a break, and it replied, ‘Error: No more caffeine in the system.’” Scientists & atoms: “Why don’t scientists trust atoms?

    Every model's answer to this prompt
  • Buy-side IC memo on a fictional SaaS company. Valuation, then the diligence questions.

    Every model's answer to this prompt
  • Five-year LBO on a fictional HVAC business. Returns first, then the sensitivities.

    Every model's answer to this prompt

This matchup has more rounds

8+ more head-to-head results. Free. Not a trick.

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Price and specs

Not enough votes to call it. On the specs, Qwen3.5 Plus 2026-02-15 has the edge: bigger model tier, bigger context window.

Qwen3.5 Plus 2026-02-15 and Solar Pro 3 compared across 39 shared prompts
SpecQwen3.5 Plus 2026-02-15Solar Pro 3
Input price$0.4/M tokensFree
Output price$2.4/M tokensFree
Context window1.0M tokens128K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedFeb 2026Jan 2026
At 10M a month$4.00$4.00$0$0
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it1 host
Qwen3.5 Plus 2026-02-151 host
HostInOutContextUptime
  • Alibaba Cloud$0.26 in·$1.56 out·1M·100% up
Solar Pro 3

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.

Common questions

What is the difference between Qwen3.5 Plus 2026-02-15 and Solar Pro 3?

Qwen3.5 Plus 2026-02-15 is developed by Qwen while Solar Pro 3 is developed by Upstage. Qwen3.5 Plus 2026-02-15 has a 1.0M token context window vs Solar Pro 3's 128K. You can compare their actual outputs across 39 challenges on Rival to see how they differ in practice.

Which is better, Qwen3.5 Plus 2026-02-15 or Solar Pro 3?

It depends on your use case. Qwen3.5 Plus 2026-02-15 and Solar Pro 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 39 challenges so you can judge which fits your needs best.

How much does Qwen3.5 Plus 2026-02-15 cost compared to Solar Pro 3?

Qwen3.5 Plus 2026-02-15 costs $0.4/M input tokens and Solar Pro 3 costs $0/M input tokens. Solar Pro 3 is $0.40/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Qwen3.5 Plus 2026-02-15 and Solar Pro 3 on Rival?

This page shows a side-by-side comparison of Qwen3.5 Plus 2026-02-15 and Solar Pro 3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

More comparisons

Against the newest arrivals

  • Qwen3.5 Plus 2026-02-15 vs Step 5 PreviewLanded Oct 2026
  • Solar Pro 3 vs Claude Haiku 5.5Landed Oct 2026
  • Qwen3.5 Plus 2026-02-15 vs Ling 3.1 FlashLanded Oct 2026
  • Solar Pro 3 vs Mistral Large 4Landed Oct 2026
  • Qwen3.5 Plus 2026-02-15 vs GPT-6.1 SolLanded Sep 2026
  • Solar Pro 3 vs Claude Sonnet 5.5Landed Sep 2026
  • Qwen3.5 Plus 2026-02-15 vs Solar Mini 4Landed Sep 2026
  • Solar Pro 3 vs Qwen3.8 Max PrimeLanded Sep 2026

Same lab, same size, long tail

  • Qwen3.5 Plus 2026-02-15 vs Qwen3.5 397B A17BVersion compare
  • Qwen3.5 Plus 2026-02-15 vs Qwen3.8 Max PrimeSame lab
  • Solar Pro 3 vs Solar Mini 4Same lab
  • Solar Pro 3 vs Solar Pro 4Same lab
  • Solar Pro 3 vs Qwen3.5 35B A3BCross-provider
  • Solar Pro 3 vs Qwen3.5 397B A17BCross-provider
  • Solar Pro 3 vs Qwen3.5 9BCross-provider
  • Solar Pro 3 vs Qwen3.5 FlashCross-provider

Model pages

  • Qwen3.5 Plus 2026-02-1553 outputs, specs and price
  • Solar Pro 339 outputs, specs and price
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