Whether you're building a live voice assistant, a responsive chatbot, or interactive multiplayer tools powered by AI, this API puts real in real-time AI.
- Conversational AI Developers: Build ultra-responsive chatbots, assistants, and agents that interact with users like real humans.
- Voice App Builders: Integrate with speech-to-text and text-to-speech for voice assistants that talk back without awkward pauses.
- Customer Support Platforms: Reduce wait time between user queries and AI-generated responses to elevate UX.
- Gaming & Virtual Worlds Creators: Enable NPCs and avatars to respond dynamically and instantly.
- Education & Training Products: Deliver tutoring, real-time feedback, and adaptive learning tools powered by lightning-fast AI.
- Enterprise Teams: Integrate real-time LLMs into productivity tools, search, automation, and co-pilot workflows.
🤖 How Does It Work?
- Step 1: Access the Streaming API: Use the /v1/chat/completions endpoint with GPT-4o and stream=true. You’ll start receiving tokens immediately as the model thinks—no need to wait for the full answer.
- Step 2: Connect to the Real-Time API: The new low-latency real-time API can be accessed via a WebSocket connection for the absolute fastest response (sub-300ms round-trip), enabling seamless, conversational use cases.
- Step 3: Process and Display Output: As tokens stream in, render them in your UI or feed them to a TTS engine or virtual character in real time.
- Step 4: Continue Interaction Smoothly: Because of the low latency and smarter turn-taking, users feel like they’re talking to someone live—not just prompting an AI.
- Bonus: Multimodal Capabilities: Real-time response isn't just for text. The API also supports vision and audio inputs—meaning truly multimodal interaction is finally here.
- Ultra-Low Latency (Under 300ms): It’s one of the first large-scale APIs to offer sub-second AI interactions at scale.
- WebSocket Support: Persistent connections allow for faster streaming and turn-taking in conversations.
- Multimodal Input Support: Text, images, and audio—seamlessly processed in real time.
- Human-Like Turn-Taking: GPT-4o’s enhanced capabilities let it listen and respond simultaneously, enabling more natural conversation flow.
- Built on GPT-4o: The most advanced OpenAI model to date, with faster inference and native audio + vision understanding.
- 🚀 Insanely Fast: Ideal for voice assistants, chatbots, and tools that need near-instant replies.
- 🧠 Smarter Conversations: GPT-4o handles interruptions, rapid turns, and mixed-modal inputs better than previous models.
- 🎙️ Natural Speech UX: When paired with text-to-speech, it's the closest thing yet to speaking with a human.
- 🧩 Flexible Integration: REST and WebSocket support make it easy to plug into nearly any tech stack.
- 🔧 Still Requires Engineering Finesse: To hit ultra-low latency, you'll need solid WebSocket architecture and fast client rendering.
- 💸 Cost Considerations for Scale: Fast = frequent calls = higher usage. Watch those bills if you’re building at volume.
- 📚 Limited Docs for Edge Use Cases: Some use cases (like real-time audio-visual blending) still lack deep implementation examples.
Free
$ 0.00
Standard voice mode
Real-time data from the web with search
Limited access to GPT-4o and o4-mini
Limited access to file uploads, advanced data analysis, and image generation
Use custom GPTs
Plus
$ 20.00
Extended limits on messaging, file uploads, advanced data analysis, and image generation
Standard and advanced voice mode
Access to deep research, multiple reasoning models (o4-mini, o4-mini-high, and o3), and a research preview of GPT-4.5
Create and use tasks, projects, and custom GPTs
Limited access to Sora video generation
Opportunities to test new features
Pro
$ 200.00
Unlimited access to all reasoning models and GPT-4o
Unlimited access to advanced voice
Extended access to deep research, which conducts multi-step online research for complex tasks
Access to research previews of GPT-4.5 and Operator
Access to o1 pro mode, which uses more compute for the best answers to the hardest questions
Extended access to Sora video generation
Access to a research preview of Codex agent
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Inception Labs is an AI research company that develops Mercury, the world's first commercial diffusion-based large language models. Unlike traditional autoregressive LLMs that generate tokens sequentially, Mercury models use diffusion architecture to generate text through parallel refinement passes. This breakthrough approach enables ultra-fast inference speeds of over 1,000 tokens per second while maintaining frontier-level quality. The platform offers Mercury for general-purpose tasks and Mercury Coder for development workflows, both featuring streaming capabilities, tool use, structured output, and 128K context windows. These models serve as drop-in replacements for traditional LLMs through OpenAI-compatible APIs and are available across major cloud providers including AWS Bedrock, Azure Foundry, and various AI platforms for enterprise deployment.
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Editorial Note
This page was researched and written by the ATB Editorial Team. Our team researches each AI tool by reviewing its official website, testing features, exploring real use cases, and considering user feedback. Every page is fact-checked and regularly updated to ensure the information stays accurate, neutral, and useful for our readers.
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