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  5. Mercury 2.5 PreviewvsTernary Bonsai 2 27B
Updated Sep 2026

Mercury 2.5 PreviewvsTernary Bonsai 2 27B

Mercury 2.5 Preview is cheaper than Ternary Bonsai 2 27B at $0.04/M vs $0.075/M input tokens.

Mercury 2.5 Preview and Ternary Bonsai 2 27B compared across 9 shared prompts
SpecMercury 2.5 PreviewTernary Bonsai 2 27B
Input price$0.04/M tokens$0.075/M tokens
Output price$0.15/M tokens$0.5/M tokens
Context window260K tokens262K tokens
Free API (OpenRouter)NoNo
ReleasedAug 2026Sep 2026
Side by side

Same prompt, both answers

Opening lines from 4 of the 9 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 2.5 Preview186 words
Dish Name: Rustic Sun-Dried Pasta Ingredients (7 Pantry Staples): Spaghetti (or any long pasta) Canned crushed tomatoes Olive oil Garlic powder Dried oregano Salt Black pepper Prep Time: 5 minutes Cook Time: 15 minutes Total Time: 20 minutes Instructions: Boil the Pasta: Bring a large pot of salted water to a boil.
Read the full answer
Ternary Bonsai 2 27B358 words
🍫 Velvet Hour Skillet Cakes A one-pan, one-pan-pour, one-lick-the-spoon kind of dessert. Fluffy, deeply chocolate, and done before your coffee goes cold. Serves: 2–3 Prep: 10 min Cook: 12–15 min Total: ~25 min The 7 Ingredients # Ingredient Amount 1 All-purpose flour ¾ cup 2 Granulated sugar ⅓ cup 3 Unsweetened cocoa…
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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 2.5 Preview176 words
Here is a straightforward 4-week roadmap designed to build sustainable habits without overwhelming you. Core Pillars Nutrition: Focus on whole foods and hydration. Activity: Prioritize consistent movement over intensity. Restoration: Protect sleep quality and manage energy.
Read the full answer
Ternary Bonsai 2 27B729 words
1-Month Foundation Plan: Health & Longevity How to Use This Plan Pick one area per week's focus while maintaining the other two at a baseline level. The point is consistency over intensity. You're building a habit identity, not a transformation.
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Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

Mercury 2.5 Preview608 words
For the Experienced Software Engineer Think of training as a massive distributed job where the model is a stateful service learning to minimize error on a specific objective function. Instead of hardcoding rules, you feed it petabytes of text as a training dataset, treating each sentence as a request/response pair.
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Ternary Bonsai 2 27B1,636 words
For the Distributed-Systems Engineer Think of the model as a single, enormous state object—roughly 150 billion floating-point parameters—that has been trained offline over months on a cluster of thousands of GPUs.
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Startup Pitch Teardown

Here's a pitch deck summary for a startup called "MindMeld AI": **Slide 1 - Vision:** "We're building the future of human-AI collaboration.…

Mercury 2.5 Preview312 words
Here are the three weakest claims in the MindMeld AI pitch, along with analysis and recommendations for improvement. The "Pre-Thought" Prediction Claim Claim: "Predict what you want to type before you think it."
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Ternary Bonsai 2 27B1,109 words
The 3 Weakest Claims in the MindMeld AI Pitch "FDA Clearance (40% of $15M)" — Slide 7 The claim: They're allocating $6M (40% of the entire raise) toward "FDA clearance" for a consumer EEG headband that decodes thoughts into text for everyday smartphone use.
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Our Verdict
Mercury 2.5 Preview
Mercury 2.5 Preview
Ternary Bonsai 2 27B
Ternary Bonsai 2 27B

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

Mercury 2.5 Preview costs 3.3x less per token.

Too close to call
API pricing

Cost per 1M tokens

Mercury 2.5 Preview
Input
$0.04
1.9× cheaper
Output
$0.15
3.3× cheaper
Ternary Bonsai 2 27B
Input
$0.07
Output
$0.50

Mercury 2.5 Preview is cheaper on both: 1.9× input, 3.3× output.

Where to run it

2 hosts

Mercury 2.5 Preview1 host
HostInOutContextUptime
Inception$0.04 in·$0.15 out·260k·100% up
Ternary Bonsai 2 27B1 host
HostInOutContextUptime
DDarkbloomint4$0.07 in·$0.50 out·262k·100% 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 Preview is developed by Inception while Ternary Bonsai 2 27B is developed by PrismML. Mercury 2.5 Preview has a 260K token context window vs Ternary Bonsai 2 27B's 262K. You can compare their actual outputs across 9 challenges on Rival to see how they differ in practice.

It depends on your use case. Mercury 2.5 Preview and Ternary Bonsai 2 27B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 9 challenges so you can judge which fits your needs best.

Mercury 2.5 Preview costs $0.04/M input tokens and Ternary Bonsai 2 27B costs $0.075/M input tokens. Mercury 2.5 Preview is $0.03/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 Preview and Ternary Bonsai 2 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.

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Model pages

Mercury 2.5 Preview logo
Mercury 2.5 Preview58 outputs, specs and price
Ternary Bonsai 2 27B logo
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