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. Compare/
  3. OpenAI Codex Mini vs Ternary Bonsai 2 27B
Updated Sep 2026

OpenAI Codex Mini vs Ternary Bonsai 2 27B

Ternary Bonsai 2 27B is cheaper than OpenAI Codex Mini at $0.075/M vs $1.5/M input tokens.

Interactive Catan Board

Hex grid you can resize with a slider. Geometry plus state.

Loading the build
OpenAI Codex Mini
Loading the build
Ternary Bonsai 2 27B

Which answer wins?

Written rounds

2 prompts
  • Three minutes of stand-up. Puns are banned.

    OpenAI Codex Mini: [Comedian walks onstage] Hey, everyone! Great to see you all tonight. I'm Jamie—if you thought that intro was enthusiastic, you should've seen me when I realized this place has Wi-Fi. Seriously, though, I love stand-up.

    Ternary Bonsai 2 27B: "The Optimization" (walks to mic, adjusts it, takes a breath) I used to think being an adult was hard. Now I'm not sure it's even a thing anymore. I think we just got... optimized. I was at the grocery store last week. I walked up to the cereal aisle, and I'm standing there, just vibing. I'm not picking a brand.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    OpenAI Codex Mini: Sure—here are five jokes: I asked the librarian if books about paranoia were available. She whispered, "They're right behind you." Why did the tomato turn red? Because it saw the salad dressing. I bought a boat because it was for sail. Don't trust stairs—they're always up to something.

    Ternary Bonsai 2 27B: Here are 5 jokes: Why did the scarecrow win an award? Because he was outstanding in his field. I told my wife she was drawing her eyebrows too high. She looked surprised. Why don't scientists trust atoms? Because they make up everything. What do you call a fake noodle? An impasta. I'm on a seafood diet.

    Every model's answer to this prompt

Price and specs

OpenAI Codex Mini and Ternary Bonsai 2 27B compared across 8 shared prompts
SpecOpenAI Codex MiniTernary Bonsai 2 27B
Input price$1.5/M tokens$0.075/M tokens
Output price$6/M tokens$0.5/M tokens
Context window200K tokens262K tokens
Free API (OpenRouter)NoNo
ReleasedMay 2025Sep 2026
At 10M a month$15.00$15.00$0.75$0.75
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it1 host
OpenAI Codex Mini

No hosts listed on OpenRouter.

Ternary Bonsai 2 27B1 host
HostInOutContextUptime
  • DDarkbloomint4$0.07 in·$0.50 out·262k·99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 2 Oct 2026.

Common questions

What is the difference between OpenAI Codex Mini and Ternary Bonsai 2 27B?

OpenAI Codex Mini is developed by OpenAI while Ternary Bonsai 2 27B is developed by PrismML. OpenAI Codex Mini has a 200K token context window vs Ternary Bonsai 2 27B's 262K. You can compare their actual outputs across 8 challenges on Rival to see how they differ in practice.

Which is better, OpenAI Codex Mini or Ternary Bonsai 2 27B?

It depends on your use case. OpenAI Codex Mini and Ternary Bonsai 2 27B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 8 challenges so you can judge which fits your needs best.

How much does OpenAI Codex Mini cost compared to Ternary Bonsai 2 27B?

OpenAI Codex Mini costs $1.5/M input tokens and Ternary Bonsai 2 27B costs $0.075/M input tokens. Ternary Bonsai 2 27B is $1.43/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare OpenAI Codex Mini and Ternary Bonsai 2 27B on Rival?

This page shows a side-by-side comparison of OpenAI Codex 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.

More comparisons

Against the newest arrivals

  • OpenAI Codex Mini vs GPT-6.1 SolLanded Sep 2026
  • Ternary Bonsai 2 27B vs Claude Sonnet 5.5Landed Sep 2026
  • OpenAI Codex Mini vs Solar Mini 4Landed Sep 2026
  • Ternary Bonsai 2 27B vs Qwen3.8 Max PrimeLanded Sep 2026
  • OpenAI Codex Mini vs GLM 5.3 PrimeLanded Sep 2026
  • Ternary Bonsai 2 27B vs Qwen3.8 Omni FlashLanded Sep 2026
  • OpenAI Codex Mini vs Command A+Landed Sep 2026
  • Ternary Bonsai 2 27B vs Claude Opus 5.5Landed Sep 2026

Same lab, same size, long tail

  • OpenAI Codex Mini vs GPT-6 Luna ProSame lab
  • OpenAI Codex Mini vs GPT-6 Sol ProSame lab
  • Ternary Bonsai 2 27B vs Muse Glimmer 30BSame size
  • Ternary Bonsai 2 27B vs Mercury 2.5 PreviewSame size
  • Ternary Bonsai 2 27B vs GPT-5.2 ProCross-provider
  • Ternary Bonsai 2 27B vs GPT-5.3 ChatCross-provider
  • Ternary Bonsai 2 27B vs GPT-5.3-CodexCross-provider
  • Ternary Bonsai 2 27B vs GPT-5.4Cross-provider

Model pages

  • OpenAI Codex Mini10 outputs, specs and price
  • Ternary Bonsai 2 27B44 outputs, specs and price
Workshop · 150 skills

Build your own version.

Editable skills and working examples for your agent.

Explore $79Free sample
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