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  5. GPT-4.5vsTernary Bonsai 2 27B
Updated Sep 2026

GPT-4.5vsTernary Bonsai 2 27B

Ternary Bonsai 2 27B is cheaper than GPT-4.5 at $0.075/M vs $75/M input tokens.

GPT-4.5 and Ternary Bonsai 2 27B compared across 1 shared prompts
SpecGPT-4.5Ternary Bonsai 2 27B
Input price$75/M tokens$0.075/M tokens
Output price$150/M tokens$0.5/M tokens
Context window128K tokens262K tokens
Free API (OpenRouter)NoNo
ReleasedFeb 2025Sep 2026
Our Verdict
GPT-4.5
GPT-4.5
Ternary Bonsai 2 27B
Ternary Bonsai 2 27B

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

Ternary Bonsai 2 27B costs 300x less per token.

Too close to call
API pricing

Cost per 1M tokens

GPT-4.5
Input
$75.00
Output
$150.00
Ternary Bonsai 2 27B
Input
$0.07
1000× cheaper
Output
$0.50
300× cheaper

Ternary Bonsai 2 27B is cheaper on both: 1000× input, 300× output.

Where to run it

1 host

GPT-4.5

No hosts listed on OpenRouter.

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-4.5 is developed by OpenAI while Ternary Bonsai 2 27B is developed by PrismML. GPT-4.5 has a 128K token context window vs Ternary Bonsai 2 27B's 262K. You can compare their actual outputs across 1 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-4.5 and Ternary Bonsai 2 27B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 1 challenges so you can judge which fits your needs best.

GPT-4.5 costs $75/M input tokens and Ternary Bonsai 2 27B costs $0.075/M input tokens. Ternary Bonsai 2 27B is $74.92/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 GPT-4.5 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

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GPT-4.526 outputs, specs and price
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