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The Agents Index

Synthflow

Enterprise voice AI platform with in-house telephony for inbound and outbound call automation.

Synthflow is a voice AI platform for building, testing and running phone agents that handle inbound and outbound calls. It ships its own telephony network, a visual flow designer, a simulation test centre and CRM, SIP and PBX integrations.

Best for
Operations and CX teams at mid-market or enterprise companies who want a visual, no-code way to design and launch phone agents without an engineering ticket.
Not for
Developer-first teams who want to assemble and own every layer of the stack via API with full model choice (see Vapi or Retell AI instead), or anyone who wants a fixed, low-commitment self-serve monthly price.

What we checked

Pages last read
Facts checked
29 factsFrom 23 sources
AI answers
Named in 17 of 150Our October check

Synthflow in our research

All research

What we checked on Synthflow

YesPartlyNo

What it doesPartly

Done-for-you service

You run the software, but Enterprise agreements include Synthflow-led implementation, launch and ongoing optimisation.

Implementation, onboarding, testing, training, launch support, and ongoing optimization

synthflow.ai/pricingChecked

How much it does unattendedYes

Runs autonomously

Agents answer and place calls unattended, escalating to a human only on triggers you configure.

They can ask clarifying questions, offer alternate responses, or escalate to a human. You can control handoff triggers based on failed attempts or…

synthflow.aiChecked

How much it does unattendedYes

Multi-agent

Subflows act as specialised agents that a parent flow triggers for individual tasks.

Architect modular voice flows with a flexible, API-connected builder. Subflows act as specialized agents that handle tasks independently

synthflow.aiChecked

How much it does unattendedYes

Agent permissions

Flow logic, approved knowledge sources, end-call reasons and handoff triggers bound what an agent may say or do.

Synthflow agents follow defined logic and approved knowledge sources — ensuring compliant, brand-safe replies and zero off-script or hallucinated…

synthflow.aiChecked

Which models it runs onNo

Claude

The agent model selector enumerates OpenAI GPT variants and Synthflow's own LLMs; no Anthropic model is offered.

The AI Model selector controls which large language model powers your agent's responses. Available options include: GPT-4o ... Synthflow LLM ...…

docs.synthflow.ai/general-configurationChecked

Which models it runs onYes

GPT

The model selector lists GPT-4o, GPT-4.1 and multiple GPT-5 variants for agent responses.

GPT-4o -- fast, versatile model balancing quality and speed.

docs.synthflow.ai/general-configurationChecked

Which models it runs onNo

Open models

The published model list contains only OpenAI GPT variants and Synthflow's proprietary LLMs; no open-weight model appears.

Synthflow LLM -- optimized for real-time, natural phone conversations. Advanced Synthflow LLM -- strongest reasoning in the Synthflow family, for…

docs.synthflow.ai/general-configurationChecked

Which models it runs onPartly

Model choice

You pick the model per agent, but only from Synthflow's list of GPT and Synthflow LLM options.

Pick the model that matches your latency, cost, and quality requirements.

docs.synthflow.ai/general-configurationChecked

Where you use itPartly

In your editor

No Synthflow editor extension; Claude, Claude Code and Cowork can drive the workspace over MCP from where a developer already works.

Claude, Claude Code, and Cowork can all manage your Synthflow workspace from a conversation.

docs.synthflow.ai/anthropic

Where you use itNo

On the command line

The deployment channels are enumerated as telephony, WhatsApp, WebSocket, chat, API, Workflows, Zapier and GoHighLevel; Synthflow ships no command-line tool.

Deploying your Synthflow AI agent gets it live and ready to take calls or messages. Each deployment path is complementary, so you can enable several…

docs.synthflow.ai/deploy-your-agent

Where you use itNo

In your pipeline

The connector needs an interactive browser sign-in, which the vendor says rules out unattended jobs.

The official connector requires an interactive browser sign-in, so it is not suited to CI or scheduled jobs.

docs.synthflow.ai/anthropic

Where you use itYes

In a browser

Agents are created, tested and published from a hosted dashboard with an in-product assistant.

Aurora is the workspace assistant built into the dashboard. Describe what you want in natural language to scaffold agents, query calls, manage…

docs.synthflow.ai/getting-startedChecked

Whose machine it runs onNo

Self-hosted

Deployment choice is limited to picking one of three Synthflow-operated clusters at workspace creation.

Synthflow operates three clusters. The table below shows where each one stores workspace data and where live processing runs.

docs.synthflow.ai/customer-regionChecked

Whose machine it runs onNo

Open source

Subscriber Terms grant a non-transferable licence to use the software and forbid decompiling it.

Synthflow grants to the User during the term of the Agreement a non-exclusive, non-transferable, non-sublicensable license to use the Software for…

docs.synthflow.ai/terms-conditionsChecked

What it costs to runYes

How it meters

Calls are metered per second and aggregated into billed minutes; chat converts at 5 AI messages per usage minute.

Phone calls are measured per second, starting when the human and the AI agent connect and ending when the call terminates. Partial seconds are…

docs.synthflow.ai/usageChecked

What it costs to runYes

Free tier

You can build an agent at no cost; charges begin at launch on a pay-as-you-go basis.

Yes, you can start and build your AI agent for free using our library of industry templates or build your own. You can design custom call flows, set…

synthflow.aiChecked

What it costs to runYes

API access

Platform API with bearer-key auth covers agents, calls, campaigns, knowledge bases and subaccounts.

Generate a Synthflow API key under Admin > Workspace Settings > API Keys, send it with Bearer authentication, and follow basic key-management…

docs.synthflow.ai/authenticationChecked

What it costs to runYes

MCP server

A hosted MCP server in three regions exposes agent, call and knowledge-base tools to MCP clients.

The Synthflow MCP server lets you use Synthflow directly from the AI tools you already prefer, such as Claude, Claude Desktop, ChatGPT, and Codex.

docs.synthflow.ai/mcp-serverChecked

What it costs to runPartly

Bring your own key

Your own OpenAI or Azure OpenAI key can power supported models, but the option is enabled per account; telephony can also be your own carrier or SIP trunk.

After connection, Synthflow routes supported LLM traffic through your OpenAI account using your API key. Billing and usage limits follow the terms of…

docs.synthflow.ai/openaiChecked

Buying it for a teamYes

A company can buy it

Sold as a sales-led annual Enterprise agreement with MSA/DPA and security review.

MSA/DPA support, data handling review, workspace controls, and enterprise security review

synthflow.ai/pricingChecked

Buying it for a teamNo

Seat model

Pricing is scoped on call volume and concurrency, not on seats; workspace members are governed by roles instead.

Enterprise contracts start at $30,000 annually. Final pricing is scoped around call volume, concurrency, telephony setup, integrations, security…

synthflow.ai/pricingChecked

Buying it for a teamYes

Pooled budget

Subaccounts draw on the parent agency's minute balance and share its concurrency total, with optional caps.

Subaccounts share the main agency account's minutes. You can allocate caps with Limits and defaults.

docs.synthflow.ai/getting-startedChecked

Buying it for a teamYes

Admin controls

Agency admins grant or revoke per-subaccount permissions for actions, agent types, editor options and integrations.

If you want to enable or disable specific actions for all or certain subaccounts, you can do that in Admin. For example, you can only allow select…

docs.synthflow.ai/manage-subaccount-per…Checked

Buying it for a teamPartly

Audit log

API logs give an audit trail of every request an agent makes, with retention set by plan; no admin-action audit log is documented.

API logs: Audit trail of all API requests triggered by your agents

docs.synthflow.ai/logsChecked

Buying it for a teamPartly

Single sign-on

SAML/OIDC via WorkOS with Okta, Entra ID, Google SAML and Auth0, but only on Enterprise.

Single Sign-On (SSO) is available on Enterprise plans only. ... Synthflow uses WorkOS as the SSO infrastructure provider.

docs.synthflow.ai/securityChecked

What happens to your codeYes

Opt out of training

A blanket contractual commitment not to train on customer input or output; published Marketplace templates are the one carve-out.

Synthflow does not use Customer Input or Output to train, fine-tune, or otherwise improve its own or any third party’s AI or machine learning models.

docs.synthflow.ai/terms-conditions

What happens to your codeYes

Data residency

Choose a US or EU cluster keeping storage and compute in one region; the legacy Global cluster stores in the EU. Choice is permanent.

US and EU keep both storage and compute in a single region. New workspaces should use US or EU unless you are continuing on the legacy Global…

docs.synthflow.ai/customer-regionChecked

What happens to your codePartly

Getting out

Manual CSV export of call logs is available to all; scheduled exports to S3, BigQuery or SFTP are Enterprise-only, and unused minutes carry over only if the agreement says so.

If you're an Enterprise client, you can configure daily exports of your call data to destinations of your choice, including Amazon S3, Google…

docs.synthflow.ai/export-call-dataChecked

What happens to your codeYes

Certifications

ISO 27001:2022, SOC 2, GDPR, HIPAA and PCI DSS v4.0.1, with documents in a Trust Vault.

Synthflow is compliant with: ISO 27001:2022, SOC 2, GDPR, HIPAA, PCI DSS V4.0.1

docs.synthflow.ai/securityChecked

Synthflow price and terms

What needs a higher plan

Enterprise
Done-for-you service, Single sign-on

For AI agents

MCP server
Yes
API
Yes
Synthflow's pricing page

Pricing page, captured

synthflow.ai/pricing, checked

Synthflow alternatives

All 9 alternatives

Questions about Synthflow

How much does Synthflow cost?
Synthflow costs $30,000 a year. From synthflow.ai/pricing, checked 28 October 2026.
Does Synthflow have an API or an MCP server?
It has an API. It has an MCP server.
Is Synthflow open source, and can you host it yourself?
It is not open source. You cannot host it yourself.
What have we checked on Synthflow?
29 facts, under these headings: What it does, how much it does unattended, which models it runs on, where you use it, whose machine it runs on, what it costs to run, buying it for a team, what happens to your code.
How do we check Synthflow?
We hold 29 facts on Synthflow, quoted from 23 pages. Facts and price last checked 28 October 2026. Last change found 3 September 2026.

How we check every listing

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AI assistants like ChatGPT and Claude opened The Agents Index pages 2,746 times in September. Claiming is free. You get this page's reader numbers and the verified owner mark. You confirm it with an email at synthflow.ai.

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