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  5. GPT-5 NanovsTernary Bonsai 2 27B
Updated Sep 2026

GPT-5 NanovsTernary Bonsai 2 27B

Ternary Bonsai 2 27B is the newer model, released after GPT-5 Nano.

GPT-5 Nano and Ternary Bonsai 2 27B compared across 9 shared prompts
SpecGPT-5 NanoTernary Bonsai 2 27B
Input price—$0.075/M tokens
Output price—$0.5/M tokens
Context window—262K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedAug 2025Sep 2026
Side by side

Same prompt, both answers

Opening lines from 2 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…

GPT-5 Nano196 words
Sunlit Lemon-Garlic Pasta A bright, quick dish using seven common pantry staples. Ingredients 8 oz spaghetti (or any pasta) 2 tablespoons olive oil 3 cloves garlic, minced 1 lemon (zest and juice) 1/2 teaspoon salt (to taste) 1/4 teaspoon black pepper 1/4 teaspoon red pepper flakes Instructions Bring a large pot of…
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…
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…

GPT-5 Nano1,089 words
Here’s a simple, actionable 1-month plan focused on three beginner-friendly pillars: Diet, Movement (exercise), and Sleep. It’s designed to be easy to start, with small weekly progressions you can actually stick to.
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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Our Verdict
Ternary Bonsai 2 27B
Ternary Bonsai 2 27B
GPT-5 Nano
GPT-5 NanoRunner-up

Not enough votes to call it. On the specs, Ternary Bonsai 2 27B has the edge: bigger model tier, newer, bigger context window.

Too close to call
API pricing

Cost per 1M tokens

GPT-5 Nano
Input
—
Output
—
Ternary Bonsai 2 27B
Input
$0.07
Output
$0.50
Where to run it

3 hosts

GPT-5 Nano2 hosts
HostInOutContextUptime
Azure AI Foundry$0.05 in·$0.40 out·400k·99.9% upOpenAI$0.05 in·$0.40 out·400k·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

GPT-5 Nano is developed by OpenAI while Ternary Bonsai 2 27B is developed by PrismML. You can compare their actual outputs across 9 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5 Nano 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.

This page shows a side-by-side comparison of GPT-5 Nano 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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Same lab, same size, long tail

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Model pages

GPT-5 Nano logo
GPT-5 Nano59 outputs, specs and price
Ternary Bonsai 2 27B logo
Ternary Bonsai 2 27B9 outputs, specs and price
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