Conversational AI is technology that lets a machine understand natural language and respond in it, by text or by voice. It combines language understanding, dialogue management, and language generation, and for spoken systems adds speech-to-text and text-to-speech. It powers chatbots, voice assistants, and voice agents that hold real conversations rather than following rigid scripts.
How conversational AI works
A conversational AI system runs a loop:
- Understand. Interpret what the user means (natural language understanding), not just the literal words.
- Decide. Track context across turns and choose a response (dialogue management, increasingly handled by a large language model).
- Respond. Generate a natural-language reply (natural language generation).
For voice systems, two more steps wrap around that loop: speech-to-text transcribes what the user said, and text-to-speech speaks the reply back. Those two steps, plus a strict latency budget, are what make voice harder than text.
The main types of conversational AI
The line between them is blurring as LLMs replace scripted flows, but the channel still drives the hard problems: text is forgiving on latency, voice is not.
Why voice quality matters
For any spoken conversational AI, the voice is what users judge first. A robotic voice makes even a smart agent feel broken. That is why the text-to-speech model underneath matters: Simba 3.2 ranks #1 on the independent Artificial Analysis TTS leaderboard (as of July 2026) and joint-2nd on Voice Arena.
Building conversational AI with SpeechifyAI
SpeechifyAI provides voice agents as a single API that bundles the full loop, speech-to-text, an LLM, and #1-ranked text-to-speech:
- One bundled rate: $0.068 to $0.075 per minute, no passthrough billing.
- ~300ms latency, 30+ languages, 1,500+ voices.
- 60 free agent minutes per month to prototype.
SpeechifyAI is Speechify's developer platform, distinct from the consumer Speechify app.
Related guides
- Conversational AI voice agents: the ultimate guide
- What is the best AI voice agent platform?
- AI voice for customer service and call centers
Get started
Build conversational AI with a free SpeechifyAI API key at speechify.ai, 60 free agent minutes per month. Install the SDK with pip install speechify-api or npm install @speechify/api.
