Inworld overview
What it is
Inworld is a voice and LLM platform for developers. It offers text-to-speech (TTS-2 and TTS-2 Flash), speech-to-text, speech-to-speech and LLM inference, all paid from one credit balance. Its new Inworld Inference is, in Inworld's words, "an LLM inference API for consumer apps," serving open models such as Gemma 4, GLM, DeepSeek and MiMo.
Key features
- An OpenAI-compatible API with streaming support.
- Four service tiers you choose per request, API key or workspace: Flex (lowest price, fails fast and unbilled when busy), Default (no rate limits), Priority (uptime commitment) and Fast (realtime decoding).
- A router for fallback models, conditional rules and weighted A/B splits.
- Dedicated deployments where you can bring your own weights.
- Zero data retention on hosted models, with LLM inference running in the US.
Getting started
- Point the OpenAI SDK at
https://api.inworld.ai/v1, add your Inworld API key and pick a model ID such asinworld/models/gemma-4-26b-a4b-it. You can also try any model in the browser playground without an API key.
Pricing
Inworld's pricing starts with On-Demand at $0, pay as you go, which includes up to 70 minutes of TTS or 400 minutes of STT free. Paid plans are Creator at $25 a month, Builder at $100, Developer at $300 and Growth at $1,500, each granting the same amount in monthly credits. Enterprise is custom.
| Plan | Price | Detail |
|---|---|---|
| On-Demand | $0 | pay as you go, which includes up to 70 minutes of TTS or 400 minutes of STT free |
| Creator | $25 a month | |
| Builder | $100 | |
| Developer | $300 | |
| Growth | $1,500 | |
| Enterprise | custom |
TTS-2 runs from $25 per 1M characters on On-Demand down to $12.50 on Growth. LLM inference starts at $0.07 per 1M input tokens; Gemma 4 26B costs $0.07 input and $0.34 output per 1M tokens at Default rates. Yearly billing gives two months free.
Good to know
- Monthly credits roll over for up to three months while you're on a paid plan, and downgrading forfeits remaining credits.
- Concurrent requests range from 5 on On-Demand to 500 on Growth.
- Every plan includes a commercial license, plus GDPR and SOC 2 Type II compliance. EU and India data residency are Enterprise only.
Drafted with AI assistance. No sponsorship.