All comparisons
Seeduplex vs GPT-4o Voice
The core question: does full-duplex architecture actually matter in practice?
Choose Seeduplex if...
- • Natural two-way conversation is the #1 goal
- • Users are in noisy environments
- • Building customer service or voice companion apps
- • API cost is a significant factor (~7x cheaper)
Choose GPT-4o Voice if...
- • You need 50+ language support
- • Expressive narration / storytelling matters
- • Already deep in the OpenAI ecosystem
- • Need a stable, well-documented GA API
| Feature | Seeduplex | GPT-4o Voice |
|---|---|---|
| Architecture | Full-duplex native | Half-duplex pipeline |
| Simultaneous listen + speak | ||
| Native interruption handling | ||
| Semantic noise suppression | ||
| Response latency | ~200ms | ~450ms |
| False interrupt rate | 50% lower than half-duplex | Baseline |
| Language support | EN, ZH (others coming) | 50+ languages |
| Voice expressiveness | Good | Excellent |
| Free tier | ||
| API pricing (per min) | ~$0.008 | ~$0.06 |
| API maturity | Early access | Stable / GA |
| Production deployment |
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