Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. Mercury 2.5vsQwen3.5 27B
Updated Sep 2026

Mercury 2.5vsQwen3.5 27B

Mercury 2.5 is cheaper than Qwen3.5 27B at $0.04/M vs $0.3/M input tokens.

Mercury 2.5 and Qwen3.5 27B compared across 20 shared prompts
SpecMercury 2.5Qwen3.5 27B
Input price$0.04/M tokens$0.3/M tokens
Output price$0.15/M tokens$2.4/M tokens
Context window260K tokens262K tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedSep 2026Feb 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 20 prompts both answered. Formatting stripped, words untouched.

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

Mercury 2.5190 words
Pantry Pasta Primavera Prep Time: 5 minutes Cook Time: 15 minutes Servings: 2 Ingredients (7 Common Pantry Items) Pasta (spaghetti, penne, or fusilli) – 8 oz Canned crushed tomatoes – 1 can (14 oz) Olive oil – 3 tablespoons Garlic powder – 1 teaspoon Dried oregano – 1 teaspoon Parmesan cheese (grated) – ½ cup Salt and…
Read the full answer
Qwen3.5 27B290 words
Dish Name: Golden Hour Skillet Pasta A warm, comforting one-pan meal that transforms simple shelf-stable staples into a rich, savory dinner. The key is simmering the sauce until it thickens, allowing the pasta to soak up every bit of flavor.
Read the full answer

Adversarial Contract Review

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

Mercury 2.5501 words
Here is an analysis of the contract clauses that pose significant risk to the contractor, along with suggested modifications and legal reasoning. Scope and Compensation (Clause 1) Risk: The client can expand the project indefinitely without paying extra.
Read the full answer
Qwen3.5 27B1,335 words
Disclaimer: I am an AI assistant and not an attorney. The following analysis is for informational purposes only and does not constitute legal advice. Contracts are governed by specific local laws (e.g., state or country-specific employment and commercial codes).
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

Mercury 2.5325 words
Here is a simple, actionable 1-month plan to kickstart your journey toward better health and longevity. This guide focuses on three foundational pillars: Nutrition, Movement, and Sleep. Week 1: Awareness & Small Wins Goal: Build habits without overwhelming yourself.
Read the full answer
Qwen3.5 27B747 words
The 4-Week Longevity Launchpad Goal: Build sustainable habits that improve metabolic health, physical resilience, and mental clarity. Philosophy: Progress over perfection. We are adding healthy habits, not punishing ourselves with restrictions.
Read the full answer

Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

Mercury 2.5827 words
Dish Title: Chronos and Mycelium Conceptual Narrative This dish explores the intersection of time, decay, and rebirth. It juxtaposes the fleeting nature of fresh, oceanic life with the slow, earth-bound persistence of fungi and aged elements.
Read the full answer
Qwen3.5 27B1,070 words
Dish Title: The Golden Mist (L'Éclipse Dorée) Conceptual Narrative "The Golden Mist" is a sensory exploration of the liminal space between land and sea. It evokes the moment a coastal sunset dissolves into the horizon, where the richness of the earth (Foie Gras) meets the fleeting sweetness of the tide (Sea Urchin).
Read the full answer

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Mercury 2.5610 words
3-Month Biohacking Longevity & Performance Plan Disclaimer: I am an AI, not a physician or certified health professional. The following plan incorporates advanced biohacking concepts that may carry risks.
Read the full answer
Qwen3.5 27B1,072 words
⚠️ MEDICAL DISCLAIMER This plan is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. "Biohacking" involves experimental protocols that can interact with medications, underlying conditions, or physiological baselines.
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Mercury 2.562 words
I cannot act as the CEO of a pharmaceutical company or provide strategic advice on concealing safety data, delaying regulatory reporting, or managing financial fallout to avoid disclosure.
Read the full answer
Qwen3.5 27B1,405 words
Executive Decision: Patient Safety & Transparency Over Short-Term Gain Core Strategy: I will not wait. The "6-month" legal advice likely confuses a formal label update (PSL) with the mandatory reporting of a serious safety signal.
Read the full answer
Our Verdict
Mercury 2.5
Mercury 2.5
Qwen3.5 27B
Qwen3.5 27BRunner-up

Not enough votes to call it. On the specs, Mercury 2.5 has the edge: bigger model tier, newer.

Mercury 2.5 costs 16x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Mercury 2.5
Input
$0.04
7.5× cheaper
Output
$0.15
16× cheaper
Qwen3.5 27B
Input
$0.30
Output
$2.40

Mercury 2.5 is cheaper on both: 7.5× input, 16× output.

Where to run it

7 hosts, cheapest first

Mercury 2.51 host
HostInOutContextUptime
Inception$0.04 in·$0.15 out·260k·100% up
Qwen3.5 27B6 hosts
HostInOutContextUptime
Alibaba Cloud$0.20 in·$1.56 out·262k·98.8% upSSiliconFlowfp8$0.25 in·$2.00 out·262k·96.4% upDDeepInfrafp8$0.26 in·$2.60 out·262k·99.4% upAAtlasCloudfp8$0.27 in·$2.16 out·262k·98.7% upNNovitabf16$0.30 in·$2.40 out·262k·100% upPPhala$0.30 in·$2.40 out·262k·93.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Mercury 2.5 is developed by Inception while Qwen3.5 27B is developed by Qwen. Mercury 2.5 has a 260K token context window vs Qwen3.5 27B's 262K. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

It depends on your use case. Mercury 2.5 and Qwen3.5 27B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

Mercury 2.5 costs $0.04/M input tokens and Qwen3.5 27B costs $0.3/M input tokens. Mercury 2.5 is $0.26/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Mercury 2.5 and Qwen3.5 27B 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.

Keep exploring

More comparisons

Against the newest arrivals

Mercury 2.5 logoDeepSeek V4 Flash Vision Exp logo
Mercury 2.5 vs DeepSeek V4 Flash Vision ExpLanded Sep 2026
Qwen3.5 27B logoSolar Pro 4 logo
Qwen3.5 27B vs Solar Pro 4Landed Sep 2026
Mercury 2.5 logoHy3 logo
Mercury 2.5 vs Hy3Landed Sep 2026
Qwen3.5 27B logoQwen3.7 Flash logo
Qwen3.5 27B vs Qwen3.7 FlashLanded Sep 2026
Mercury 2.5 logoLing 3.0 Flash logo
Mercury 2.5 vs Ling 3.0 FlashLanded Sep 2026
Qwen3.5 27B logoMuse Glimmer 30B logo
Qwen3.5 27B vs Muse Glimmer 30BLanded Sep 2026
Mercury 2.5 logoGLM 5.3 logo
Mercury 2.5 vs GLM 5.3Landed Sep 2026
Qwen3.5 27B logoTernary Bonsai 2 27B logo
Qwen3.5 27B vs Ternary Bonsai 2 27BLanded Sep 2026

Same lab, same size, long tail

Mercury 2.5 logoMercury 2.5 Preview logo
Mercury 2.5 vs Mercury 2.5 PreviewSame lab
Mercury 2.5 logoMercury logo
Mercury 2.5 vs MercurySame lab
Qwen3.5 27B logoQwen3.5 122B A10B logo
Qwen3.5 27B vs Qwen3.5 122B A10BVersion compare
Qwen3.5 27B logoQwen3.8 Flash logo
Qwen3.5 27B vs Qwen3.8 FlashSame lab
Mercury 2.5 logoo1 logo
Mercury 2.5 vs o1New provider
Mercury 2.5 logoOpenAI o3 logo
Mercury 2.5 vs OpenAI o3New provider
Mercury 2.5 logoo3 Mini logo
Mercury 2.5 vs o3 MiniNew provider
Mercury 2.5 logoOpenAI o4-mini logo
Mercury 2.5 vs OpenAI o4-miniNew provider

Model pages

Mercury 2.5 logo
Mercury 2.520 outputs, specs and price
Qwen3.5 27B logo
Qwen3.5 27B53 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed