> ## Documentation Index > Fetch the complete documentation index at: https://docs.tensorlake.ai/llms.txt > Use this file to discover all available pages before exploring further. # How much does Tensorlake cost and what are the limits? > Tensorlake pricing, prepaid Usage Credits, Pro rates, per-sandbox vCPU, RAM, and disk limits, concurrency, and session duration. For a complete comparison, see [Pricing and billing](/platform/billing). For current commercial terms, see [tensorlake.ai/pricing](https://www.tensorlake.ai/pricing). ## How is Tensorlake pricing structured? * **Free:** unmetered sessions within the Free plan's resource, concurrency, and duration limits. * **Usage Credits:** prepaid balance with resource usage deducted as you run sandboxes. * **Pro:** a monthly subscription plus discounted metered resource usage. * **Enterprise:** custom pricing and limits for larger or private deployments. ## Does Tensorlake have a free tier? Yes. The **Free tier is \$0 forever with no credit card required.** It includes: * 1 concurrent sandbox * 1 vCPU, 1 GB RAM, and a 10 GB root disk * Sessions up to 2 hours * Unmetered sessions * Self-serve docs and community Slack support * SOC 2 Type 2 compliance ## What are the Tensorlake plan tiers? | Plan | Price | Concurrent sandboxes | Maximum session duration | | ----------------- | ----------------------------: | -------------------: | -----------------------: | | **Free** | \$0 forever | 1 | 2 hours | | **Usage Credits** | Prepaid packs starting at \$5 | Up to 100 | 24 hours | | **Pro** | \$250 / month + usage | 1,000 | Unlimited | | **Enterprise** | Custom quote | Unlimited | Unlimited | ## What is the maximum sandbox size on each plan? | Plan | vCPU | RAM | Root disk | | ----------------- | -----: | -----: | --------: | | **Free** | 1 | 1 GB | 10 GB | | **Usage Credits** | 4 | 16 GB | 100 GB | | **Pro** | 16 | 64 GB | 100 GB | | **Enterprise** | Custom | Custom | Custom | These are per-sandbox limits. RAM must also be between 1 GB and 8 GB per vCPU. ## What are the default resources for a Tensorlake Sandbox? | Resource | Default | How to override | | ------------ | -------------------: | ------------------------------------------ | | vCPU | `1` | `cpus=` (SDK) or `--cpus` (CLI) | | RAM | `1024 MB` | `memory_mb=` (SDK) or `--memory` (CLI) | | Root disk | `10240 MiB` (10 GiB) | `disk_mb=` (SDK) or `--disk_mb` (CLI) | | Idle timeout | `600` seconds | `timeout_secs=` (SDK) or `--timeout` (CLI) | ## How many concurrent sandboxes can I run? Concurrency limits how many sandboxes can run at the same time; it does not change the resource limit of each sandbox. | Plan | Concurrent sandboxes | | ------------- | -------------------: | | Free | 1 | | Usage Credits | Up to 100 | | Pro | 1,000 | | Enterprise | Unlimited | ## How much does metered sandbox usage cost? | Resource | Usage Credits | Pro | | ----------------------------- | ------------: | -------: | | Active CPU per core-hour | \$0.07 | \$0.042 | | RAM per GB-hour | \$0.015 | \$0.009 | | Root disk per GB-hour | \$0.0002 | \$0.0001 | | Snapshot storage per GB-month | \$0.07 | \$0.07 | Pro is \$250 per month plus metered usage. Enterprise rates are custom. ## How do Usage Credits work? One compute unit (CU) is worth $0.01. Choose a $5 pack (500 CUs), $10 pack (1,000 CUs), or $20 pack (2,000 CUs), then top up as needed. You can also enable threshold-based auto-refill. Usage Credits are prepaid. If your balance reaches zero, Tensorlake blocks new sandbox activity and stops running sandboxes rather than creating an unexpected postpaid charge. ## How is sandbox usage metered? Runtime usage is measured by the second, even though rates are displayed per hour: * **CPU:** active runtime execution when active metering is available; allocated vCPU time is used if the active sample is unavailable or unreliable. * **RAM and root disk:** allocated capacity while the sandbox is running. * **Snapshot storage:** stored data per GB-month while the sandbox is suspended. ## Do I pay for a suspended Tensorlake Sandbox? A suspended sandbox does not incur running CPU, RAM, or root-disk charges. Its preserved state is billed as snapshot storage at **\$0.07 per GB-month** on Usage Credits and Pro. ## What is the default sandbox timeout and maximum session duration? | Plan | Maximum session duration | | ------------- | -----------------------: | | Free | 2 hours | | Usage Credits | 24 hours | | Pro | Unlimited | | Enterprise | Unlimited | The default `timeout_secs` is `600` (10 minutes). Setting `timeout_secs=0` requests the maximum allowed by your plan. When the idle timeout elapses, a named sandbox suspends and an ephemeral sandbox terminates. See [Sandbox lifecycle: timeout](/sandboxes/lifecycle#timeout). ## How do I choose sandbox resources? Pass `cpus`, `memory_mb`, and `disk_mb` when you create a sandbox. Disk size is growth-only: you can grow the root disk when creating from an image or restoring from a filesystem snapshot, but you cannot shrink it below its source. See [Sandbox lifecycle: resources](/sandboxes/lifecycle#resources) and the [SDK reference](/sandboxes/sdk-reference) for the resource parameters. ## What are the build-time defaults for a Tensorlake sandbox image? Image builds default to `2` vCPU, `4096 MB` of RAM, and a `10 GiB` generated root disk. Override them with `--cpus`, `--memory`, and `--disk_mb` in the CLI, or `cpus`, `memoryMb`, and `diskMb` in SDK options. See [Build and Import Images](/sandboxes/images#build-resources) for the complete build-resource options.