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Inworld AI (inworld-ai)

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Full detail: Where this data comes from

Inworld AI is a real-time voice AI infrastructure provider. The Inworld platform delivers text-to-speech, speech-to-text, an end-to-end speech-to-speech Realtime API, and an OpenAI- and Anthropic-compatible LLM Router behind one API surface and one billing relationship. Inworld's voice models lead the Artificial Analysis Speech Arena and are used to power voice agents, language-learning apps, AI companions, avatar experiences, game NPCs, and Twilio-backed phone agents. The platform supports instant and professional voice cloning, voice design from natural language, lipsync-grade phoneme alignment, on-premise TTS deployment, and zero-data-retention configurations for regulated workloads.

APIs.json: https://raw.githubusercontent.com/api-evangelist/inworld-ai/refs/heads/main/apis.yml

Scope

  • Position: Consuming
  • Access: 3rd-Party

Tags

  • AI
  • Artificial Intelligence
  • Voice
  • Text To Speech
  • Speech To Text
  • Realtime
  • LLM Routing
  • Voice Cloning
  • Conversational AI
  • Game AI

Timestamps

  • Created: 2026-05-25T00:00:00.000Z
  • Modified: 2026-05-25

APIs

Inworld TTS API

Inworld TTS — real-time text-to-speech API with the #1-ranked voice models on the Artificial Analysis Speech Arena. Supports the Realtime TTS-2 model (100+ languages, natural-language steering), Realtime TTS 1.5 Max (15 languages), and Realtime TTS 1.5 Mini (cost-optimized, sub-120 ms first-token). Provides synchronous synthesis, server-streamed synthesis, and a streaming WebSocket interface with instant + professional voice cloning, voice design from text prompts, custom pronunciation, pause controls, word/character/phoneme alignment for lipsync, and zero-data-retention plus on-premise deployment options.

Tags

  • AI
  • Artificial Intelligence
  • Text To Speech
  • Voice
  • Audio

Properties

Inworld Voice API

Inworld Voice API — manage custom voices used by the TTS and Realtime APIs. Clone voices from short audio samples (instant voice cloning) or design voices from natural-language descriptions plus optional reference audio. Lists, gets, updates, and deletes voices, and exposes a publish endpoint for sharing voices across a workspace.

Tags

  • AI
  • Artificial Intelligence
  • Voice
  • Voice Cloning
  • Voice Design

Properties

Inworld STT API

Inworld STT — speech-to-text transcription API with synchronous transcribe and a streaming WebSocket endpoint. Multi-provider routing (currently Whisper variants via Groq) with 99+ language support, word timestamps, voice profiling, prompt biasing for domain-specific vocabulary, and configurable end-of-turn detection for low-latency conversational agents.

Tags

  • AI
  • Artificial Intelligence
  • Speech To Text
  • Transcription
  • Voice

Properties

Inworld Realtime API

Inworld Realtime — end-to-end speech-to-speech voice pipeline (STT + LLM + TTS) exposed over WebSocket and WebRTC. OpenAI-Realtime-API-compatible event protocol (session.update, input_audio_buffer.append, response.create, etc.) so existing OpenAI Realtime clients can swap base URLs. Includes server-side and semantic VAD, function/tool calling, MCP server tunneling, Twilio media-stream integration, and JWT-based session authentication.

Tags

  • AI
  • Artificial Intelligence
  • Realtime
  • Voice
  • WebSocket
  • WebRTC

Properties

Inworld LLM Router API

Inworld LLM Router — OpenAI-and-Anthropic-compatible chat-completions endpoint that routes prompts across hundreds of provider models (OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, Groq, etc.). Reusable named routers, conditional routing, provider routing, A/B traffic splitting, prompt compression, caching, web search, and a Claude-Code-compatible mode let teams consolidate model spend behind one API.

Tags

  • AI
  • Artificial Intelligence
  • LLM
  • Routing
  • OpenAI Compatible

Properties

Inworld Models API

Inworld Models API — list every model available across the Router (third-party LLMs) and Inworld first-party TTS, STT, and Realtime endpoints. Returns provider, model id, capabilities (chat, vision, tool use, etc.), and pricing tier metadata for runtime discovery.

Tags

  • AI
  • Artificial Intelligence
  • Models
  • Discovery

Properties

Common Properties

Maintainers

FN: Kin Lane Email: info@apievangelist.com URL: https://apievangelist.com

About

Inworld AI is a real-time voice AI infrastructure provider. The Inworld platform delivers text-to-speech, speech-to-text, an end-to-end speech-to-speech Realtime API, and an OpenAI- and Anthropic-compatible LLM Router behind one API surface and one billing relationship.

Topics

aiapis-jsonartificial-intelligenceconversational-aigame-aillm-routingrealtimespeech-to-texttext-to-speechvoicevoice-cloning

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