Microsoft Foundry hosted agents vs Mosaic Sandbox

Microsoft Foundry hosted agents costs $0.0994 per vCPU-hour and Mosaic Sandbox costs $0.025 per vCPU-hour. Microsoft Foundry hosted agents runs microVMs. Mosaic Sandbox runs Firecracker microVMs.

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

Mosaic Sandbox

Linux microVM sandboxes for coding agents.

Isolation: Firecracker microVM
Free tier: Not listed
Max session: Not listed

Visit site Mosaic Sandbox profile

What is different

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

Field

Microsoft Foundry hosted agents

Mosaic Sandbox

vCPU, per hour: Microsoft Foundry hosted agents: $0.0994; Mosaic Sandbox: $0.025
RAM, per GiB-hour: Microsoft Foundry hosted agents: $0.0118; Mosaic Sandbox: Included
Billing: Microsoft Foundry hosted agents: Per second; Mosaic Sandbox: Bundled machine time
Largest sandbox: Microsoft Foundry hosted agents: 2 vCPU · 4 GiB; Mosaic Sandbox: 16 vCPU · 32 GiB
Concurrent sandboxes: Microsoft Foundry hosted agents: Up to 2,000; Mosaic Sandbox: Up to 200
Isolation: Microsoft Foundry hosted agents: MicroVM; Mosaic Sandbox: Firecracker microVM
SDKs: Microsoft Foundry hosted agents: Python, JavaScript / TypeScript; Mosaic Sandbox: Python, TypeScript, Go
Integrations: Microsoft Foundry hosted agents: Claude Agent SDK, LangChain, MCP, OpenAI Agents SDK; Mosaic Sandbox: LangChain, MCP, Claude Code, Vercel AI SDK

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

Mosaic Sandboxsandbox.mosaicos.com/pricingsandbox.mosaicos.com

Pricing

vCPU, per hour: Microsoft Foundry hosted agents: $0.0994; Mosaic Sandbox: $0.025
RAM, per GiB-hour: Microsoft Foundry hosted agents: $0.0118; Mosaic Sandbox: Included
Storage: Microsoft Foundry hosted agents: Not listed; Mosaic Sandbox: Free
Free tier: Microsoft Foundry hosted agents: Not listed; Mosaic Sandbox: Not listed
Paid plan from: Microsoft Foundry hosted agents: Pay as you go; Mosaic Sandbox: Pay as you go
Billing: Microsoft Foundry hosted agents: Per second; Mosaic Sandbox: Bundled machine time

Limits

Max session: Microsoft Foundry hosted agents: Not listed; Mosaic Sandbox: Not listed
Idle stop: Microsoft Foundry hosted agents: After 15 minutes; Mosaic Sandbox: Not listed
Largest sandbox: Microsoft Foundry hosted agents: 2 vCPU · 4 GiB; Mosaic Sandbox: 16 vCPU · 32 GiB
Concurrent sandboxes: Microsoft Foundry hosted agents: Up to 2,000; Mosaic Sandbox: Up to 200

Platform

Isolation: Microsoft Foundry hosted agents: MicroVM; Mosaic Sandbox: Firecracker microVM
GPU: Microsoft Foundry hosted agents: Not listed; Mosaic Sandbox: No
Snapshots: Microsoft Foundry hosted agents: Not listed; Mosaic Sandbox:
Pause and resume: Microsoft Foundry hosted agents:; Mosaic Sandbox:

Developer

SDKs: Microsoft Foundry hosted agents: Python, JavaScript / TypeScript; Mosaic Sandbox: Python, TypeScript, Go
Integrations: Microsoft Foundry hosted agents: Claude Agent SDK, LangChain, MCP, OpenAI Agents SDK; Mosaic Sandbox: LangChain, MCP, Claude Code, Vercel AI SDK

Trust

License: Microsoft Foundry hosted agents: Not listed; Mosaic Sandbox: Not listed
BYOC: Microsoft Foundry hosted agents: Not listed; Mosaic Sandbox: Not listed

Hourly cost

One sandbox running for one hour

Size

Microsoft Foundry hosted agents

Mosaic Sandbox

1 vCPU · 2 GiB: Microsoft Foundry hosted agents: $0.123; Mosaic Sandbox: $0.025
2 vCPU · 4 GiB: Microsoft Foundry hosted agents: $0.246; Mosaic Sandbox: $0.050
4 vCPU · 8 GiB: Microsoft Foundry hosted agents: $0.492; Mosaic Sandbox: $0.100

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 or the OpenAI Agents SDK.

Mosaic Sandbox fits when

You use Claude Code or the Vercel AI SDK.
You want the lower list price: $0.050 against $0.246 an hour for 2 vCPU and 4 GiB.
You need snapshots.
You need a sandbox larger than 2 vCPU · 4 GiB.

More comparisons

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Microsoft Foundry hosted agents

Mosaic Sandbox

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Microsoft Foundry hosted agents fits when

Mosaic Sandbox fits when

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