### Answer Based on the available sources, for call center usage prioritizing speed, intelligence, and cost-effectiveness, GPT-4o Mini appears to be the most appropriate choice [(1) ]() [(2) ]() [(3) ]() . Here's why: **Speed**: GPT-4o models are designed for near-instantaneous responses for simple tasks, making them suitable for real-time call center interactions [(3) ]() . **Cost**: GPT-4o Mini offers the best pricing at $0.000150 per 1,000 input tokens and $0.000600 per 1,000 output tokens . This is significantly cheaper than other options like GPT-4o ($0.00250/$0.01000) or Claude models ($0.012-$0.06 per minute) . **Intelligence**: While GPT-4o achieved 88.7 on the MMLU benchmark (surpassing GPT-4's 86.5) , GPT-4o Mini still provides robust capabilities for customer service applications . **Available Models**: Retell supports multiple models including

gpt-4.1

,

gpt-4.1-mini

,

gpt-4.1-nano

,

gpt-5

,

gpt-5-mini

,

gpt-5-nano

, and others [(1) ]() [(2) ]() . **Important Consideration**: For tool calling (common in call centers for booking appointments, accessing CRM data, etc.) , a lower

model_temperature

is recommended . You can set this when creating your LLM configuration. If you need even lower latency, consider the speech-to-speech models like

gpt-realtime-mini

or

gpt-realtime-1.5

.

​ To learn more, see the sources I considered: [[1] Create Retell LLM](https://docs.retellai.com/api-references/create-retell-llm) [[2] Update Retell LLM](https://docs.retellai.com/api-references/update-retell-llm) [[3] Choosing the Best LLM for Your AI Voice Agents | Retell AI](https://www.retellai.com/blog/choosing-the-best-llm-for-your-voice-ai-agents) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer Mes données sont récentes. D'après les changelogs de la plateforme Retell AI, GPT-4.1 et sa famille de modèles sont maintenant disponibles [(1) ]() . Voici la comparaison des modèles GPT-4.1 disponibles sur Retell AI : Intelligence : GPT-4.1 > GPT-4o > GPT-4o mini > GPT-4.1 mini > GPT-4.1 nano *Latence (plus bas = plus rapide) * : GPT-4.1 nano < GPT-4.1 mini < GPT-4o mini < GPT-4o < GPT-4.1 *Prix (par minute) * : - GPT-4.1 nano : 0,004 $ - GPT-4o mini : 0,006 $ - GPT-4.1 mini : 0,016 $ - GPT-4.1 : 0,045 $ - GPT-4o : 0,050 $ Pour un usage en centre d'appels, GPT-4.1 nano ou GPT-4o mini seraient les meilleurs choix selon vos priorités : - GPT-4.1 nano : le plus rapide et le moins cher (0,004 $/min) , idéal si la vitesse et le coût sont prioritaires - GPT-4o mini : bon équilibre entre intelligence, vitesse et coût (0,006 $/min) Ces modèles sont actuellement disponibles sur la plateforme Retell AI .

​ To learn more, see the sources I considered: [[1] Platform Changelogs | Retell AI](https://www.retellai.com/changelog) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.