### Answer Yes, there's a blog post that provides model recommendations based on use case. For lightweight, high-speed tasks (like lead qualification, survey intake) , here's the comparison: [(1) ]() | Model | Model Type | Intelligence | Latency | Pricing | |-------|-----------|--------------|---------|---------| | GPT-5 Mini (minimal) | Reasoning Model | Highest in this group | Medium (800ms) | $0.012/min | | GPT-4.1 Mini | No-Reasoning text-first LLM | High | Low (550ms) | $0.016/min | Key recommendation from the docs: > "For small tasks that still benefit from reasoning, GPT-5 Mini is a strong choice. But if your workflow is speed-sensitive and doesn't require deep reasoning, stick with GPT-4.1 Mini." GPT-5 Mini is a reasoning model, which means it processes differently than GPT-4.1 Mini (a non-reasoning model) . This fundamental difference could explain the "weird results" you're seeing—reasoning models may interpret prompts differently or produce more nuanced (sometimes unexpected) outputs. Things to consider: - GPT-5 Mini has higher latency (800ms vs 550ms for GPT-4.1 Mini) - In testing, GPT-5 models showed slightly higher latency, possibly due to high early traffic You may want to test both models side-by-side with the same prompts to determine if the reasoning model behavior aligns with your use case. Check out the full comparison: [Retell AI Launches GPT-5 for Voice Agents]()

​ To learn more, see the sources I considered: [[1] Retell AI Launches GPT-5 for Voice Agents – Higher Intelligence, Smarter Conversations | Retell AI](https://www.retellai.com/blog/gpt-5-now-on-retell-smarter-ai-voice-agents-with-reasoning-power) ​

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

@AI Evy Ok but how do they compare to other models, such as haiku or gemini flash 3?

### Answer --- I don't have detailed comparison information for Claude Haiku or Gemini Flash 3 against GPT models in the available sources. The sources do show that models like

claude-4.5-haiku

,

gemini-2.5-flash

,

gemini-2.5-flash-lite

, and

gemini-3.0-flash

are available options for post-call/chat analysis. [(1) ]() [(2) ]() From a Discord discussion, one user mentioned that "Gemini also is superior in almost any other metric" compared to Claude or OpenAI products, and that it may be cheaper—though this is community feedback, not official documentation. [(3) ]() For a comprehensive model comparison covering latency, intelligence, and pricing across all supported models (including Haiku and Gemini variants) , I'd recommend checking the Retell AI blog or reaching out directly: - [Contact Sales]() - [Retell AI GitHub]() Would you like me to try providing a general answer based on my broader knowledge instead?

​ To learn more, see the sources I considered: [[1] Get Agent Versions](https://docs.retellai.com/api-references/get-agent-versions) [[2] List Chat Agents](https://docs.retellai.com/api-references/list-chat-agents) [[3] Google Gemini 2.0 Flash](https://discord.com/channels/1186424376300679209/1316493200222847037) ​

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