Best AI Voice Agents for GPT-4

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Compare the Top AI Voice Agents that integrate with GPT-4 as of December 2025

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This a list of AI Voice Agents that integrate with GPT-4. Use the filters on the left to add additional filters for products that have integrations with GPT-4. View the products that work with GPT-4 in the table below.

What are AI Voice Agents for GPT-4?

AI voice agents are advanced virtual assistants powered by artificial intelligence that can understand, process, and respond to spoken language in real time. They use natural language processing (NLP) and machine learning to engage in human-like conversations, handling customer service, scheduling, and various automated tasks. These agents can integrate with business systems, providing seamless interactions for users across multiple platforms such as phone calls, chat applications, and smart devices. By continuously learning from interactions, they improve their accuracy and efficiency over time, reducing the need for human intervention. AI voice agents enhance productivity, streamline workflows, and offer businesses a scalable solution for handling customer inquiries and operations. Compare and read user reviews of the best AI Voice Agents for GPT-4 currently available using the table below. This list is updated regularly.

  • 1
    OneAI

    OneAI

    OneAI

    Select from our library, fine-tune, or build your own capabilities to analyze and process text, audio and video at scale. Integrate advanced NLP into your app or workflow. Select from the library or build your own. Summarize, tag and analyze language with stackable, composable NLP building blocks, built on state-of-the-art models, all with a single API call. Build and fine-tune custom Language Skills with your data using our powerful Custom-Skill engine. Only 5% of the world's population speaks English as their native language. Most of One AI’s capabilities are multilingual. So whether you build a podcast platform, CRM, content publishing tool, or any other product, the language detection, processing, transcription, analytics, and comprehension capabilities are here.
    Starting Price: $0.2 per 1,000 words
    View Software
  • 2
    Synthflow

    Synthflow

    Synthflow.ai

    Easily create AI voice assistants to make outbound calls, answer inbound calls, and schedule appointments 24/7 - no coding required! Forget lengthy development cycles and expensive machine learning teams. With Synthflow you can build sophisticated, tailored AI agents without technical skills or coding - just bring your data and ideas. Over a dozen specialized AI agents are ready to use for question answering, document search, process automation, and more. Choose an agent as-is or customize it to suit your needs. Upload data instantly from PDFs, CSVs, PPTs, URLs and more. Your agent gets smarter with every new piece of data. No caps on storage or computing resources. Store unlimited vector data in your dedicated Pinecone environment. Gain full control and transparency over how your agent learns and improves. Give your AI agent superpowers by connecting it to any data source or service.
    1 Rating
    Starting Price: €25 per month
    View Software
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