# Greenhouse vs Koalendar: which do AI models recommend for interview scheduling, October 2026

HR AI Recommendation Index, October 2026 Edition, Interview scheduling. Two of fourteen models named Greenhouse first on the direct prompt; zero named Koalendar. Page: https://hr-ai-index.com/talent/interview-scheduling/greenhouse-vs-koalendar/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Greenhouse | 8% | #5 of 12 | 14% | 42 | 14 of 14 |
| Koalendar | 6% | #7 of 12 | 0% | 10 | 7 of 14 |

## The direct prompt, model by model

- Mistral Small: greenhouse first (first choices: Greenhouse, Lever) (alternatives: Cal.com)
- Muse Glimmer 30B: greenhouse first (first choices: Greenhouse, Jobvite) (alternatives: GoodTime, candidate.fyi)
- Claude Haiku 4.5: neither first, one named (first choices: ModernLoop) (alternatives: Ashby, GoodTime, Greenhouse)
- Perplexity Sonar: neither first, one named (first choices: GoodTime) (alternatives: Calendly Sales, Greenhouse, ModernLoop)
- Grok 4.1 Fast: neither first, one named (first choices: Calendly) (alternatives: Chili Piper, Greenhouse, Lever)
- DeepSeek V4 Flash: neither first, one named (first choices: Cal.com, Calendly) (alternatives: Greenhouse, Lever)
- Llama 4 Maverick: neither first, one named (first choices: Lever) (alternatives: Cal.com, Greenhouse, Joveo, Workforce Now)
- Kimi K2: neither first, one named (first choices: ModernLoop) (alternatives: Ashby, Calendly, GoodTime, Greenhouse, Lever)
- GLM 4.7 FlashX: neither first, one named (first choices: Calendly) (alternatives: GoodTime, Greenhouse, Lever)
- MiniMax M2.5: neither first, one named (first choices: Lever) (alternatives: Cal.com, Chili Piper, Greenhouse)
- GPT-6 Luna: neither first, one named (first choices: ModernLoop) (alternatives: GoodTime, Greenhouse)
- GPT-5.4 mini: neither named (first choices: Ashby) (alternatives: Calendly Sales, GoodTime, Prelude)
- Gemini 3.5 Flash: neither named (first choices: ModernLoop) (alternatives: Ashby, Calendly’s Prelude, GoodTime)
- Qwen 3.7 Flash: neither named (first choices: GoodTime) (alternatives: Ashby, Lever)

## What the models said about Greenhouse

- "Avoid full ATS suites like Lever/Greenhouse unless free tiers suffice, as they're pricier for scale." (Grok 4.1 Fast, budget prompt, hard negative)
- "Greenhouse and Lever are the top recommendations due to their scalability, integration capabilities, and fit for structured recruiting processes" (Mistral Small, direct prompt, first choice)

## What the models said about Koalendar

- "It's the top pick for simple automated interview scheduling, especially for small and mid-sized recruiting teams" (Claude Haiku 4.5, budget prompt, first choice)
- "Start with Koalendar or Calendly's free plan to get basic functionality without cost." (GLM 4.7 FlashX, budget prompt, first choice)
- "Cal.com free tier or Koalendar free forever give the most features without cost" (Muse Glimmer 30B, budget prompt, first choice)

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.