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Inworld’s platform provides access to a wide variety of state-of-the-art models. These models offer diverse capabilities, performance levels, price points, and deployment options, enabling users to select and customize models that best match their specific use cases and application needs.

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Overview of Model Offerings

This section provides some high-level context on Inworld’s model offerings, and how they can be used in your application.
  • TTS: Text-to-Speech models can be used to generate high-quality audio for your application, such as powering a character’s voice.
  • LLM: Large Language Models are powerful models that can intake inputs (typically text, but certain models may also support other modalities) and generate text outputs. These models can be used to determine in-game actions, power conversations, generate dynamic narratives, and more.
  • Embeddings: Embeddings models convert text into high-dimensional vectors, which can be used to power intent detection, text similarity comparison, and retrieval-augmented generation (RAG).

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TTS

Inworld’s Agent Runtime and API offer access to Inworld’s family of state-of-the-art TTS models, optimized for different use cases, quality levels, and performance requirements.

Realtime TTS-2

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Our flagship, top-ranked model — the best choice for production

  • Best quality and steerability, with natural language steering for more contextually aware speech
  • Support for 200+ languages and locales
  • Ultra-low latency (100 ms TTFB*) at high concurrency
  • High quality instant voice cloning
  • Enhanced timestamps with phonetic details and visemes

Realtime TTS-2 Flash

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Our fastest, most cost-efficient model — built for latency-critical, high-volume workloads

  • Our lowest latency — 20 ms TTFB*, 5× faster than inworld-tts-2
  • Lowest cost per character
  • Same 200+ languages and locales as inworld-tts-2
  • High quality instant voice cloning
* P90 time to first audio byte, measured server-side — excludes network latency.

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Models overview

Using an earlier model? Previous-generation models (inworld-tts-1, inworld-tts-1-max, inworld-tts-1.5-max, inworld-tts-1.5-mini) are deprecated and not recommended for new projects. inworld-tts-1 and inworld-tts-1-max were discontinued on June 15, 2026 and requests to them are automatically routed to newer models. If you’re still using any of these, we recommend migrating to the TTS-2 family for better quality, latency, and cost.

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LLM

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Chat Completion

Inworld provides access to hundreds of LLMs from various providers through a unified Chat Completions API.
  • Available models: See the List Models API or the Models page in the Inworld Portal for the full list of supported models and providers
  • Pricing: Visit inworld.ai/pricing for model pricing details
  • Specific model: Call a model directly using the provider/model format (e.g., openai/gpt-5)
  • Auto-select: Set model to "auto" to automatically pick the best model based on price, latency, or performance
  • Router: Create a router for conditional routing, A/B testing, and reusable configurations, then reference it via the model field (e.g., my-router)

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Embeddings

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Terms of Service

You may not violate the terms of service or policies of third-party model providers using Inworld’s platform or your account will be subject to deactivation.