# Bland AI API + MCP vs OpenAI Realtime API

> Bland AI and OpenAI Realtime score within a point of each other for voice agents, 63.8 and 63.3 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/bland-ai-vs-openai-realtime
- Markdown: https://www.anchorterminal.com/compare/bland-ai-vs-openai-realtime.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/bland-ai-vs-openai-realtime.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/bland-ai-vs-openai-realtime.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

Bland AI API + MCP and OpenAI Realtime API score within a point of each other on agent readiness, 63.8 (B) and 63.3 (B). OpenAI Realtime API leads on schema & documentation and agent ergonomics. Both do voice agents.

- Bland AI API + MCP: grade B, 63.8/100, rank #370 of 950. Markdown https://www.anchorterminal.com/tools/bland-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/bland-ai.json
- OpenAI Realtime API: grade B, 63.3/100, rank #400 of 950. Markdown https://www.anchorterminal.com/tools/openai-realtime.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-realtime.json
- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md
- All 91 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md

## Which one, for what

### Bland AI API + MCP (B)

Good for: Teams that want one predictable per-minute bill for outbound and inbound phone agents, and personal agents that need their own US number.

Ahead on:
- Security & auth, 66 against 61
- Payments & pricing, 65 against 20
- Maintenance & community, 60 against 52

Also in its favour:
- Runs on your own machine
- Free to start without a card

Watch for: No OpenAPI document

### OpenAI Realtime API (B)

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:
- Schema & documentation, 84 against 68
- Agent ergonomics, 76 against 53

Watch for: openai.com answered 403 to our reader, so the service terms, privacy policy, sub-processor list and security pages were not read.


## Score by category

| Category | Weight | Bland AI API + MCP | OpenAI Realtime API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 67 | OpenAI Realtime API +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 68 | 84 | OpenAI Realtime API +16 |
| Agent ergonomics | 13% (16.2 this run) | 53 | 76 | OpenAI Realtime API +23 |
| Security & auth | 14% (17.5 this run) | 66 | 61 | Bland AI API + MCP +5 |
| Payments & pricing | 10% (12.5 this run) | 65 | 20 | Bland AI API + MCP +45 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 60 | 52 | Bland AI API + MCP +8 |
| Transparency & trust | 7% (8.8 this run) | 71 | 71 | even |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **63.8 · B** | **63.3 · B** | |

## Facts side by side

| Fact | Bland AI API + MCP | OpenAI Realtime API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Bland AI | OpenAI |
| Hosted endpoint | `https://api.bland.ai/v1` | `https://api.openai.com/v1/realtime` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Pay per use |
| Price for voice agents | $29.99 per month (plan) | not published |
| x402 | no | no |
| Licence | none | Proprietary service. The service terms on openai.com were not read. The Agents SDK for TypeScript and the OpenAPI description are MIT |
| Tools exposed | 42 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-13 | 2026-07-28 |
| Terms last updated | 2026-08-28 | couldn't be read |
| Privacy policy last updated | 2026-06-23 | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | yes | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 1.2k npm/wk | none |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**Bland AI API + MCP.** One per-minute rate covering STT, LLM, TTS and telephony, $0.14 on Start and $0.12 on Build. No OpenAPI document.

**OpenAI Realtime API.** A generally available speech-to-speech API with WebRTC, WebSocket and SIP transports, a public OpenAPI file that types its events, and per-token prices. Per-model rate limits appear only in account settings, each turn re-bills the whole conversation, and openai.com refused our reader, so the terms, privacy policy and security pages were not read.

## Before you call either

### Bland AI API + MCP

1. Call `wait_for_call` (it waits up to 45 seconds) instead of polling `get_call_log`
2. Send destructive MCP tools a second time with the confirmation argument
3. Space calls to the same number at least 10 seconds apart or expect a 429
4. Budget $0.015 for every outbound attempt, including ones that never connect
5. Run `validate_pathway` before saving a pathway graph

### OpenAI Realtime API

1. Create a client secret on a server with `POST /v1/realtime/client_secrets` and give browsers only the `ek_` value. Never ship the API key.
2. After a response with MCP calls finishes, send another `response.create`. The API does not create the follow-up response itself.
3. Set `truncation` with a `retention_ratio` below 1 and `token_limits.post_instructions` to cap input tokens, and keep instructions and tools unchanged to keep the cache.
4. On a WebSocket, stop playback on `input_audio_buffer.speech_started` and send `conversation.item.truncate` with `audio_end_ms`. WebRTC and SIP truncate on the server.
5. Use `gpt-realtime-2.1` or `gpt-realtime-2.1-mini`. `gpt-realtime` and `gpt-realtime-mini` shut down on 20 January 2027.

## Questions

### Which is better for AI agents, Bland AI API + MCP or OpenAI Realtime API?

Bland AI API + MCP and OpenAI Realtime API score within a point of each other on agent readiness, 63.8 (B) and 63.3 (B). OpenAI Realtime API leads on schema & documentation and agent ergonomics.

### Do Bland AI API + MCP and OpenAI Realtime API need an API key?

Both need an API key.

### Can an agent call Bland AI API + MCP and OpenAI Realtime API without installing anything?

Yes. Bland AI API + MCP has a hosted endpoint at https://api.bland.ai/v1 and OpenAI Realtime API at https://api.openai.com/v1/realtime.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/bland-ai-vs-openai-realtime.json, and with the fewest tokens: https://www.anchorterminal.com/compare/bland-ai-vs-openai-realtime.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "bland-ai", "b": "openai-realtime"}`. From a terminal: `anchor compare bland-ai openai-realtime`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/bland-ai.json and https://www.anchorterminal.com/api/v1/tools/openai-realtime.json

## Other comparisons with Bland AI API + MCP or OpenAI Realtime API

- [AssemblyAI Voice Agent API vs Bland AI API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bland-ai.md)
- [AssemblyAI Voice Agent API vs OpenAI Realtime API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-openai-realtime.md)
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- [Hume EVI (Empathic Voice Interface) vs OpenAI Realtime API](https://www.anchorterminal.com/compare/hume-evi-vs-openai-realtime.md)
- [OpenAI Realtime API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/openai-realtime-vs-retell-ai.md)
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- [OpenAI Realtime API vs Ultravox Realtime API](https://www.anchorterminal.com/compare/openai-realtime-vs-ultravox.md)
- [OpenAI Realtime API vs Vapi API + MCP](https://www.anchorterminal.com/compare/openai-realtime-vs-vapi.md)
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