Kairos - Hume AI | Hume AI
Simulate, evaluate, and benchmark your voice AI - the way humans experience it
Real-world scenario simulation, automated evals, and human-grounded studies. Bring any voice AI model. Get results in hours.
Both simulation modes. One platform
Kairos runs fully automated agent-to-agent simulations for scale and human-to-agent conversations for ground truth, grounded in the real-world scenarios your model will actually encounter. Structured results collected automatically after every run.
What Kairos evaluates
Built for the questions voice teams actually need answered
- Performance: Does the agent complete the task correctly while maintaining appropriate tone across a complex multi-turn scenario?
- Emotionally-intelligent: Does the agent recognize and adapt when a caller shifts from calm to frustrated mid-conversation?
- Reliable: Does the model perform consistently across 50 runs of the same scenario, or does it break at the edges?
- Regression: Did the latest checkpoint regress on empathy quality compared to last week's build?
STS · Expressive robustness (top 6)
Score by model
| Model | Score |
|---|---|
| gemini-2.5-flash | 4.0 |
| gemini-3.1-flash | 3.9 |
| gpt-realtime-2 | 3.7 |
| gpt-realtime-mini | 3.6 |
| cascade-2 | 3.5 |
| cascade-1 | 3.1 |
Simulate the scenarios your model will actually face
Kairos generates realistic conversation scenarios from your use cases, covering hostile callers, distressed users, complex policy edge cases, and multi-turn interactions. Run agent-to-agent for scale or human-to-agent for ground truth. Both on the same platform.
Benchmarking & regressions
Kairos runs your model against industry-standard public suites or your own private benchmarks and tracks performance across every release. When a dimension regresses, you find out before it reaches production.
TTS · Acting / Role-fit (top 6)
Score by model
| Model | Score |
|---|---|
| gemini-3.1-flash | 4.0 |
| gemini-2.5-flash | 3.6 |
| gemini-2.5-pro | 3.2 |
| openai/tts-1 | 3.1 |
| Qwen3-TTS-12Hz-1 | 1.7 |
| VibeVoice-1.5B | 3.1 |
STS · Voice naturalness (top 6)
Score by model
| Model | Score |
|---|---|
| cascade-2 | 4.3 |
| gemini-3.1-flash | 4.2 |
| gemini-2.5-flash | 4.1 |
| cascade-1 | 3.9 |
| openai/gpt-realtime-mini | 3.3 |
| openai/gpt-realtime-2 | 2.8 |
Human studies
Human raters evaluate your voice AI across dimensions like naturalness, empathy, expressiveness, and task success - giving you both objective scores and subjective qualitative signal. Compare any number of models head-to-head, on the same scenarios, with the same raters.
Run your first evaluation in days, not months
Configure the suite, run the simulations, and deliver human-grounded results, fast.