| What it does | Enterprise Voice AI platform for Speech-to-Text, Text-to-Speech, and Voice Agents
| An engine for long-running agents that rebuilds its prompt under a cap and runs on your budget
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| Stage | Established
| MVP
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| Founded | 2015
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| Based in | US
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| Pricing model | Freemium
| Freemium
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| Pricing | Flux STT Streaming: $0.0065/min (Pay As You Go), $0.0057/min (Growth); Flux Multilingual Streaming: $0.0078/min (Pay As You Go), $0.0068/min (Growth); Nova-3 Monolingual Streaming: $0.0048/min (Pay As You Go), $0.0042/min (Growth); Nova-3 Multilingual Streaming: $0.0058/min (Pay As You Go), $0.0050/
| Prototype: free during beta, then from December 16, 2026 it costs $1 per 1,000 agent calls after 1,000 monthly included calls. Production: $20 a month with 20,000 agent calls included, then $1 per 1,000 calls after that. Top-ups: $1 per 1,000 calls, from $10 to $500 at a time, never expiring.
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| Key features | - Flux STT with turn detection and interruption handling
- Nova-3 multilingual speech recognition in 50+ languages
- Ultra-low latency under 300 milliseconds
- Keyterm prompting with up to 90% higher keyword recall
- Flux TTS with latency as low as 80ms
- Speaker diarization and multi-speaker audio detection
- Smart formatting with automatic punctuation and capitalization
- Automatic redaction of sensitive information
- Custom models for edge-case scenarios
- Flexible deployment options: cloud, in-VPC, or self-hosted
| - Prompt rebuilt from journal under token cap at each step to keep it bounded as history grows
- Spending limits checked before each model call at token prices you declare
- Resume after crash without repeating finished actions
- Tool calls returned as actions for your code to carry out
- Proof of what ran: check prompts, re-run engine, download hash-chained journal
- Integrations with Vercel AI SDK, OpenAI Agents SDK, LangGraph, Mastra, Pydantic AI
- MCP server for Claude Code, Claude Projects and Codex
- Works with any model via bring-your-own-key
- TypeScript and Python clients for HTTP API access
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| What makes it different | - Conversation-aware speech platform with native turn-taking detection and interruption handling
- Unified single API combining STT, TTS, and LLM orchestration to reduce complexity and latency
- Flux TTS that thinks before speaking to maintain tone and expression across conversations
- Enterprise-grade accuracy with custom vocabulary injection and industry-tuned models
- Foundational AI company with research-driven innovation and continuous model improvements
| - Bounded prompt under a fixed cap while history grows, so costs per call stop climbing on long sessions
- Every run recorded with cryptographic proof: rebuilable prompts, hash-chained journal, re-runnable engine
- Resumes from crash without repeating finished actions using stable idempotency keys
- Budget enforcement before each model call, not reactive overage billing
- No model key storage or logging; your provider bills you directly
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 81 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 23 | 0 |
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| Citation Flow (Majestic) | 51 | 9 |
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| Referring domains (Majestic) | 7761 | 4 |
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