Microsoft Foundry hosted agents vs Phonebox

Microsoft Foundry hosted agents costs $0.0994 per vCPU-hour. Microsoft Foundry hosted agents runs microVMs. Phonebox limits a session to 3 hours.

Updated Oct 23, 2026

Microsoft Foundry hosted agents

Runs your AI agent code on Azure, with each session in its own microVM.

Isolation: MicroVM
Free tier: Not listed
Max session: Not listed

Visit site Microsoft Foundry hosted agents profile

Phonebox

Cloud Android phones that AI agents control through their screens.

Isolation: Not listed
Free tier: $2 starter credit, one time, no card
Max session: 3 hours

Visit site Phonebox profile

What is different

5 fields differ. The rest are the same or not listed.

Field

Microsoft Foundry hosted agents

Phonebox

Billing: Microsoft Foundry hosted agents: Per second; Phonebox: Bundled machine time
Idle stop: Microsoft Foundry hosted agents: After 15 minutes; Phonebox: After 5 minutes
Concurrent sandboxes: Microsoft Foundry hosted agents: Up to 2,000; Phonebox: Up to 5
SDKs: Microsoft Foundry hosted agents: Python, JavaScript / TypeScript; Phonebox: TypeScript
Integrations: Microsoft Foundry hosted agents: Claude Agent SDK, LangChain, MCP, OpenAI Agents SDK; Phonebox: MCP

Full comparison

18 fields, at each provider's list price

Microsoft Foundry hosted agentsazure.microsoft.com/en-us/pricing/details/foundry-agent-serviceazure.microsoft.com

Phoneboxphonebox.dev/pricingphonebox.dev

Pricing

vCPU, per hour: Microsoft Foundry hosted agents: $0.0994; Phonebox: Not listed
RAM, per GiB-hour: Microsoft Foundry hosted agents: $0.0118; Phonebox: Not listed
Storage: Microsoft Foundry hosted agents: Not listed; Phonebox: Not listed
Free tier: Microsoft Foundry hosted agents: Not listed; Phonebox: $2 starter credit, one time, no card
Paid plan from: Microsoft Foundry hosted agents: Pay as you go; Phonebox: Pay as you go
Billing: Microsoft Foundry hosted agents: Per second; Phonebox: Bundled machine time

Limits

Max session: Microsoft Foundry hosted agents: Not listed; Phonebox: 3 hours
Idle stop: Microsoft Foundry hosted agents: After 15 minutes; Phonebox: After 5 minutes
Largest sandbox: Microsoft Foundry hosted agents: 2 vCPU · 4 GiB; Phonebox: Not listed
Concurrent sandboxes: Microsoft Foundry hosted agents: Up to 2,000; Phonebox: Up to 5

Platform

Isolation: Microsoft Foundry hosted agents: MicroVM; Phonebox: Not listed
GPU: Microsoft Foundry hosted agents: Not listed; Phonebox: Not listed
Snapshots: Microsoft Foundry hosted agents: Not listed; Phonebox: Not listed
Pause and resume: Microsoft Foundry hosted agents:; Phonebox:

Developer

SDKs: Microsoft Foundry hosted agents: Python, JavaScript / TypeScript; Phonebox: TypeScript
Integrations: Microsoft Foundry hosted agents: Claude Agent SDK, LangChain, MCP, OpenAI Agents SDK; Phonebox: MCP

Trust

License: Microsoft Foundry hosted agents: Not listed; Phonebox: Not listed
BYOC: Microsoft Foundry hosted agents: Not listed; Phonebox: Not listed

Hourly cost

One sandbox running for one hour

Size

Microsoft Foundry hosted agents

Phonebox

1 vCPU · 2 GiB: Microsoft Foundry hosted agents: $0.123; Phonebox: Not listed
2 vCPU · 4 GiB: Microsoft Foundry hosted agents: $0.246; Phonebox: Not listed
4 vCPU · 8 GiB: Microsoft Foundry hosted agents: $0.492; Phonebox: Not listed

Compute only, at list rates.

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Which one fits

Based on the fields above

Microsoft Foundry hosted agents fits when

You use the Claude Agent SDK, LangChain or the OpenAI Agents SDK.

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Microsoft Foundry hosted agents

Phonebox

What is different

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Pricing

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Trust

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