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  5. OpenAI o4-minivsTernary Bonsai 2 27B
Updated Sep 2026

OpenAI o4-minivsTernary Bonsai 2 27B

Ternary Bonsai 2 27B is cheaper than OpenAI o4-mini at $0.075/M vs $1.1/M input tokens.

OpenAI o4-mini and Ternary Bonsai 2 27B compared across 9 shared prompts
SpecOpenAI o4-miniTernary Bonsai 2 27B
Input price$1.1/M tokens$0.075/M tokens
Output price$4.4/M tokens$0.5/M tokens
Context window—262K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedApr 2025Sep 2026
Our Verdict
OpenAI o4-mini
OpenAI o4-mini
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 8.8x less per token.

Too close to call
API pricing

Cost per 1M tokens

OpenAI o4-mini
Input
$1.10
Output
$4.40
Ternary Bonsai 2 27B
Input
$0.07
15× cheaper
Output
$0.50
8.8× cheaper

Ternary Bonsai 2 27B is cheaper on both: 15× input, 8.8× output.

Where to run it

2 hosts

OpenAI o4-mini1 host
HostInOutContextUptime
OpenAI$1.10 in·$4.40 out·200k·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

OpenAI o4-mini 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. OpenAI o4-mini 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.

OpenAI o4-mini costs $1.1/M input tokens and Ternary Bonsai 2 27B costs $0.075/M input tokens. Ternary Bonsai 2 27B is $1.03/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 OpenAI o4-mini 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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