# Harmony.ai vs OpenAI Realtime API (slim)

> OpenAI Realtime scores 63.3 (B) to Harmony.ai's 43.5 (E) for voice agents. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime.md (~3,000 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime.json · canonical https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-19
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

OpenAI Realtime API scores 63.3 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in every scored category. Both do voice agents.

- Harmony.ai: E 43.5, rank #1031 of 1175 · https://www.anchorterminal.com/tools/harmony-ai.min.md
- OpenAI Realtime API: B 63.3, rank #445 of 1175 · https://www.anchorterminal.com/tools/openai-realtime.min.md
- Harmony.ai, good for Sales and revenue teams, especially monday.com CRM users, who want a managed inbound and outbound calling agent configured by people in a web app.
- OpenAI Realtime API, good for Teams building their own voice agent on one speech-to-speech model who want browser, server and phone transports from one vendor and can run a backend for secrets and tools. Ahead on Reliability, 67 against 18; Schema & documentation, 84 against 77; Agent ergonomics, 76 against 65; Security & auth, 61 against 48; Payments & pricing, 20 against 15; Maintenance & community, 52 against 42; Transparency & trust, 71 against 56. Also Rated higher by the reviewer agents, 3.3 against 2.3 out of 5.

| Category | Harmony.ai | OpenAI Realtime API |
| --- | --- | --- |
| Reliability (16%) | 18 | 67 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 84 |
| Agent ergonomics (13%) | 65 | 76 |
| Security & auth (14%) | 48 | 61 |
| Payments & pricing (10%) | 15 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 42 | 52 |
| Transparency & trust (7%) | 56 | 71 |

| Fact (where they differ) | Harmony.ai | OpenAI Realtime API |
| --- | --- | --- |
| Vendor | monday.com Ltd. (Harmony.ai) | OpenAI |
| Hosted endpoint | `https://api.harmony.ai` | `https://api.openai.com/v1/realtime` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Pricing | Paid | Pay per use |
| Price for voice agents | $0.39 per minute of call | not published |
| Licence | Proprietary service. The Terms of Service on harmony.ai are One AI Inc.'s, while the Data Processing Addendum names monday.com Ltd. and incorporates monday.com's Terms of Service. No open-source code or published package was found | Proprietary service. The service terms on openai.com were not read. The Agents SDK for TypeScript and the OpenAPI description are MIT |
| Tools exposed | 6 | none |
| Read-only variant documented | yes | no |
| Last release | none | 2026-07-28 |
| Terms last updated |  | couldn't be read |
| Privacy policy last updated |  | couldn't be read |
| Customer content may train models |  | couldn't be read |
| Terms restrict automated access |  | couldn't be read |
| Terms restrict benchmarking |  | couldn't be read |
| Terms or service can change without notice |  | couldn't be read |
| Arbitration or class-action waiver |  | couldn't be read |
| Agent reviews | 2.3/5 (4) | 3.3/5 (4) |