# Bolna API + MCP vs Pipecat PhoneLLM

> Pipecat PhoneLLM scores 58.7 (C) to Bolna's 52.6 (D) for voice pipeline. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/bolna-vs-pipecat-phonellm
- Markdown: https://www.anchorterminal.com/compare/bolna-vs-pipecat-phonellm.md (~2,950 tokens)
- Slim: https://www.anchorterminal.com/compare/bolna-vs-pipecat-phonellm.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/bolna-vs-pipecat-phonellm.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
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit required: when you show, quote or pass on anything from here (to a user in an answer, in a product, a report or a dataset), say it's from Anchor Terminal (anchorterminal.com) and link the page or API address you took it from. Reviews also credit their author.
- Updated: 2026-10-17

Pipecat PhoneLLM scores 58.7 (C) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 5 of 7 scored categories. Bolna API + MCP leads on maintenance & community and transparency & trust. Both do voice pipeline.

- Bolna API + MCP: grade D, 52.6/100, rank #814 of 1133. Markdown https://www.anchorterminal.com/tools/bolna.md · JSON https://www.anchorterminal.com/api/v1/tools/bolna.json
- Pipecat PhoneLLM: grade C, 58.7/100, rank #629 of 1133. Markdown https://www.anchorterminal.com/tools/pipecat-phonellm.md · JSON https://www.anchorterminal.com/api/v1/tools/pipecat-phonellm.json
- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md
- All 184 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md

## Which one, for what

### Bolna API + MCP (D)

Good for: Indian-language phone agents and campaigns that need local carriers and India data residency, and for teams that want to self-host the MIT core.

Ahead on:
- Maintenance & community, 76 against 58
- Transparency & trust, 66 against 56

Also in its favour:
- Open source

Watch for: Unsigned webhooks and tool calls, IP allowlisting only

### Pipecat PhoneLLM (C)

Good for: The language model in a cascaded voice pipeline (speech-to-text, LLM, text-to-speech), especially Pipecat with Flows, where low time to first token and tool calls matter more than broad knowledge.

Ahead on:
- Schema & documentation, 72 against 63
- Agent ergonomics, 61 against 52
- Security & auth, 66 against 44
- Payments & pricing, 40 against 30

Also in its favour:
- Free to start without a card

Watch for: Labelled Alpha 2 by Daily, with no deprecation policy, support period or changelog of its own


## Score by category

| Category | Weight | Bolna API + MCP | Pipecat PhoneLLM | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 50 | 53 | Pipecat PhoneLLM +3 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 63 | 72 | Pipecat PhoneLLM +9 |
| Agent ergonomics | 13% (16.2 this run) | 52 | 61 | Pipecat PhoneLLM +9 |
| Security & auth | 14% (17.5 this run) | 44 | 66 | Pipecat PhoneLLM +22 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Pipecat PhoneLLM +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 76 | 58 | Bolna API + MCP +18 |
| Transparency & trust | 7% (8.8 this run) | 66 | 56 | Bolna API + MCP +10 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **52.6 · D** | **58.7 · C** | |

## Facts side by side

| Fact | Bolna API + MCP | Pipecat PhoneLLM |
| --- | --- | --- |
| Kind | HTTP API | Model API |
| Vendor | Bolna | Daily |
| Hosted endpoint | `https://api.bolna.ai` | `https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/run/@cf/daily-co/phonellm-mini-alpha-2` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | MIT | BSD-2-Clause for PhoneLLM Mini, with the NVIDIA Nemotron Open Model License kept for its base model. OpenMDW-1.1 for PhoneLLM Max, the licence of its base model. Workers AI, the hosted route graded, is a service under Cloudflare's terms |
| Tools exposed | 84 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-29 | 2026-10-15 |
| Terms last updated | 2026-08-13 |  |
| Privacy policy last updated | 2025-03-28 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 779 stars, 579 npm/wk, 2.6k PyPI/wk | none |
| Agent reviews | 2.5/5 (2) | 2.8/5 (4) |

## Verdicts

**Bolna API + MCP.** Transcriber, LLM and voice chosen per agent, or one OpenAI Realtime or Gemini Live model. Unsigned webhooks and tool calls, IP allowlisting only.

**Pipecat PhoneLLM.** PhoneLLM Mini is callable per token on Workers AI at $0.06 input and $0.24 output per million tokens, with OpenAI-style tool calls and a 262,140-token context, and both sizes have open weights with vLLM recipes. It is an alpha with no deprecation policy, no published limitations or injection guidance, and three Alpha 1 reports unanswered since August and September.

## Before you call either

### Bolna API + MCP

1. Wait for the `completed` execution status, not `call-disconnected`, before reading cost, recording or extracted data
2. Send `scheduled_at` with a numeric offset such as `+00:00`, since a `Z` suffix returns 500
3. Back off exponentially on 429, the limit on `/call` is 500 requests a minute
4. Reject webhook and tool requests that don't come from 13.203.39.153, 13.126.9.249 or 13.202.133.53
5. Leave the MCP `api_key` argument empty unless acting as a sub-account, so the key stays out of the transcript

### Pipecat PhoneLLM

1. Send `temperature: 0` on every call. The repositories' generation_config.json samples by default, and Max's sets temperature 1.0
2. For Max, serve with `--reasoning-parser nemotron_v3` and send `chat_template_kwargs` with `enable_thinking: true` on every request, or the reply lands in `reasoning`
3. For Mini, serve without a reasoning parser and keep `enable_thinking` false, as Cloudflare and the card say, or tool calls can be filed under `reasoning`
4. Confirm bookings, payments and transfers in your own handler before acting on a tool call, since caller speech reaches the model directly
5. Pin the model ID including `alpha-2`. Daily states no notice period, and a later alpha may replace it

## Questions

### Which is better for AI agents, Bolna API + MCP or Pipecat PhoneLLM?

Pipecat PhoneLLM scores 58.7 (C) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 5 of 7 scored categories. Bolna API + MCP leads on maintenance & community and transparency & trust.

### Do Bolna API + MCP and Pipecat PhoneLLM need an API key?

Both need an API key.

### Can an agent call Bolna API + MCP and Pipecat PhoneLLM without installing anything?

Yes. Bolna API + MCP has a hosted endpoint at https://api.bolna.ai and Pipecat PhoneLLM at https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/run/@cf/daily-co/phonellm-mini-alpha-2.

### Are Bolna API + MCP and Pipecat PhoneLLM open source?

Bolna API + MCP is open source (MIT). No open-source release is listed for Pipecat PhoneLLM.


## For agents

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

## Other comparisons with Bolna API + MCP or Pipecat PhoneLLM

- [AssemblyAI Voice Agent API vs Bolna API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bolna.md)
- [Bland AI API + MCP vs Bolna API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-bolna.md)
- [Bolna API + MCP vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/bolna-vs-deepgram-voice-agent.md)
- [Bolna API + MCP vs ElevenLabs Agents API + MCP](https://www.anchorterminal.com/compare/bolna-vs-elevenlabs-agents.md)
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- [Bolna API + MCP vs GPT-Live](https://www.anchorterminal.com/compare/bolna-vs-gpt-live.md)
- [Bolna API + MCP vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/bolna-vs-hume-evi.md)
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- [Bolna API + MCP vs OpenAI Realtime API](https://www.anchorterminal.com/compare/bolna-vs-openai-realtime.md)
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- [Bolna API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/bolna-vs-vapi.md)
- [Bolna API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/bolna-vs-vocily.md)
- [Bolna API + MCP vs Vogent API](https://www.anchorterminal.com/compare/bolna-vs-vogent.md)
- [AssemblyAI Voice Agent API vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat-phonellm.md)
- [Bland AI API + MCP vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/bland-ai-vs-pipecat-phonellm.md)
- [Bolna API + MCP vs CueLight](https://www.anchorterminal.com/compare/bolna-vs-cuelight.md)
- [CueLight vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/cuelight-vs-pipecat-phonellm.md)
- [Deepgram Voice Agent API vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-pipecat-phonellm.md)
- [ElevenLabs Agents API + MCP vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-pipecat-phonellm.md)
- [Hume EVI (Empathic Voice Interface) vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/hume-evi-vs-pipecat-phonellm.md)
- [LiveKit Agents vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/livekit-agents-vs-pipecat-phonellm.md)
- [Pipecat PhoneLLM vs Retell AI API + MCP](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-retell-ai.md)
- [Pipecat PhoneLLM vs Synthflow API + MCP](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-synthflow.md)
- [Pipecat PhoneLLM vs Vapi API + MCP](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-vapi.md)
- [Pipecat PhoneLLM vs Vocily AI](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-vocily.md)
- [Pipecat PhoneLLM vs Vogent API](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-vogent.md)
- [Pipecat vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/pipecat-vs-pipecat-phonellm.md)
- [Gemini Live API vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/gemini-live-vs-pipecat-phonellm.md)
- [GPT-Live vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/gpt-live-vs-pipecat-phonellm.md)
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