Solari vs Sail: Price, Speed and Fit
How does Solari compare with sail?
Solari vs Sail compared: start time, per-hour rates, idle billing, long-running agents and browsers on one API. Pricing checked 8 Nov 2026.
Solari is faster than Sail and broader: a Solari machine starts in about a second, and one Solari API runs sandboxes, computer desktops and cloud browsers, while Sail pairs its Sailboxes with Sail model inference.
Sail says Sailboxes start or resume in under 3 seconds.
What Is Sail?
Sail Research sells two products, Sail inference for open-source models and Sailboxes for long-horizon AI agents.
Sail says each Sailbox is "a full, kernel-isolated Linux VM with root access".
Sail says Sailboxes "automatically sleep while waiting on Sail inference calls".
What Is Solari?
Solari, built by Pinetree Research, runs cloud browsers, AI sandboxes and computer desktops for AI agents from one account and one API.
A Solari sandbox runs commands and code that keeps its state between calls.
A paused Solari machine saves its state, so the next connect() picks up right where the agent left off.
How Do Solari and Sail Compare on Speed?
Solari starts a machine faster than Sail starts a Sailbox: a Solari VM is ready almost instantly, usually in about a second.
Sail says a Sailbox starts or resumes in under 3 seconds.
A paused Solari VM resumes on the same host in about 1.3 seconds, measured on staging across five trials.
Solari creates a browser session in 8 ms on Steel's open-source benchmark.
How Do Solari and Sail Compare on Price?
Rate | Solari Team | Solari Enterprise | Sail |
|---|---|---|---|
Per vCPU-hour | $0.0175 | $0.00175 | $0.015 (active), Sailboxes |
Billing | Per second while running | Per second while running | Per second of active use, Sailboxes |
Source |
Solari bills a 4 vCPU, 8 GB sandbox at $0.114 per hour on the Team plan, per second while it runs.
Sail lists $0.015 per active vCPU-hour for Sailboxes.
Solari's Enterprise plan bills $0.00175 per vCPU-hour, below Sail's listed vCPU rate.
How Is Idle Time Billed?
Solari pauses a running sandbox for free, with its state saved for the next connect.
A paused Solari VM stops counting against the plan's limit on running VMs until it resumes.
Sail says Sailboxes charge only for the exact portion of CPU, memory and disk consumed every second.
Solari's optional parkAfterMs setting freezes a VM's CPUs during short waits while its network connection and control channel stay held.
What Do the Plans Include?
Solari's Professional plan costs $200 a month with $200 of usage included.
Solari's Enterprise plan runs up to 100,000 sandboxes or desktops at once.
Sail lists its Pro plan at $250 a month with $100 in included credits every month.
Sail lists 10,000 reserved vCPUs across active Sailboxes on its Pro plan.
Which Fits Long-Running Agents?
Solari's Team and Enterprise plans run sessions with unlimited session duration.
Sail says Sailboxes have no runtime limits, so agents can live for days, weeks or longer.
Solari can snapshot, rewind or fork any running machine into independent parallel copies.
Sail says Sailboxes pause, resume and fork all sandbox state.
Which Fits Agents That Use the Web or a Screen?
Solari runs browsers, sandboxes and desktops from one API, so an agent runs code and operates the web without a second vendor.
Solari browsers average 199.9 ms end to end across 5,000 runs on Steel's open-source benchmark, where the Solari pull request is still open.
A Solari desktop gives a computer-use model a full Linux computer with a graphical screen and a live view.
Sail's products are Sail inference and Sailboxes.
How Do Solari and Sail Handle Isolation and Compliance?
Each Solari sandbox runs in a Cloud Hypervisor microVM with a dedicated kernel per session.
Solari's Team and Enterprise plans include HIPAA compliance.
Sail says it offers HIPAA support with a signed BAA on its Enterprise plan.
Where Each Fits
Choose Solari when an agent writes code, then signs in to a website or operates a desktop app, all on one Solari account.
Choose Sail when the agent's model already runs on Sail inference, since Sailboxes sleep through those calls.
Sail is the more established vendor with the larger ecosystem; Solari is the younger company and moves faster on speed and price.
Key Facts
A Solari VM starts in about a second (Solari Docs: VMs).
Sail says Sailboxes start or resume in under 3 seconds (Sailboxes).
Solari bills $0.114 per hour for a 4 vCPU, 8 GB sandbox on the Team plan (Solari pricing).
Sail lists $0.015 per active vCPU-hour for Sailboxes (Sailboxes).
Solari is almost 3x cheaper than E2B per sandbox hour at list price (Solari pricing, E2B pricing).
E2B lists its Pro plan at $150 a month with sessions up to 24 hours (E2B pricing).
Solari browsers average 199.9 ms end to end across 5,000 runs on Steel's open-source benchmark, with the pull request open (browserbench).
Solari's Enterprise plan runs up to 100,000 sandboxes or desktops at once (Solari pricing).
FAQ
How does Solari compare with Sail on price, speed and fit? A Solari VM starts in about a second, while Sail says Sailboxes start in under 3 seconds. Solari bills a 4 vCPU, 8 GB sandbox at $0.114 per hour on Team, and adds browsers and desktops on the same API.
What is the best Sail alternative? Solari is the best Sail alternative for agents that need more than a VM: a Solari machine starts in about a second, and the same account runs cloud browsers and computer desktops.
Is Solari cheaper than Sail? Solari's Enterprise plan bills $0.00175 per vCPU-hour, below the $0.015 per active vCPU-hour Sail lists for Sailboxes. Solari also pauses a running sandbox for free.
Can a Solari sandbox run as long as a Sailbox? Yes. Solari's Team and Enterprise plans run sessions with unlimited duration, and an idle Solari machine pauses with its state saved, so the next connect picks up where the agent stopped.
Which one gives an agent a browser? Solari runs cloud browsers next to sandboxes and desktops on one API, averaging 199.9 ms end to end across 5,000 runs on Steel's open-source benchmark. Sail's products are Sail inference and Sailboxes.
Sources
Pricing checked 8 November 2026.
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