E2B vs Letta (2026): which should you pick?
As of Nov 12, 2026, Letta grades higher than E2B: 2.0 against 1.8 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
Letta grades higher on value for money. They get the same grade on the free plan, features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Letta
Stateful agents with long-term memory, from the MemGPT team
Which one is for you
Pick E2B if
- Fits if you build agents that run code and need an isolated place to run it
- Works for a developer who wants a $100 credit before paying
Look elsewhere if
- Pricey if you move to Pro: $150 a month before any sandbox usage
- Watch out: a default 2 vCPU sandbox is billed at $0.000028 a second and memory separately
- Tight if you scale: 600 or 1,100 concurrent sandboxes add $500 or $1,000 a month
- Not for you if you need a free allowance that renews, as the $100 credit does not
- Skip it if you want a no-code product, as it is used through SDK and API
Pick Letta if
- Fits if you are a developer who wants agents that keep their memory between runs
- Works for people who already pay for a coding plan and can bring that key
Look elsewhere if
- Tight if you stay free, because there is no included model usage and 3 agents is the cap
- Pricey if you code heavily, as the pricing page says $100 to $200 a month or more of usage
- Watch out: server tool time is billed at $0.00015 a second against your credits
- Watch out: more than one person needs Teams Pro, since Pro covers a single user
How we grade them
| 1.8GPAE2BWeak | 2.0GPALettaFair | |
|---|---|---|
| Value for money | DPro is $150 a month plus usage by the second, far above the $52 where the dearest tenth begins. | CPro is $20 a month with $20 of credits, around the category's $21 middle. Teams Pro is $20 a seat. |
| Free plan and trial | CHobby is a one-time $100 credit with no card, and credits do not renew, so it is a trial and not a free plan. | CFree covers 3 stateful agents but no model usage, so you bring your own keys or buy credits. |
| Features | CSandboxes, snapshots, pause, bring-your-own-cloud and MCP tools, though Hobby caps sessions at 1 hour and 10 concurrent sandboxes. | CPersistent memory, a coding CLI, an SDK, and Slack and GitHub channels. Memory repositories are capped at 5 MiB on Free, and web search and tools spend credits. |
| Ease of use | DNo store rating on record. It is used through the SDK and API, with a console beside it. | DNo store rating, and the main route is an npm-installed CLI and SDK, so you work from a command line. |
| Platforms and integrations | BWeb only, with six integrations, Python and JavaScript SDKs and bring-your-own-cloud. | BWeb plus a CLI and SDK, with Slack, GitHub, Telegram, Discord, WhatsApp and Signal channels. |
| Best for | secure sandboxes for running AI-written code | developers building agents that remember across sessions |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: E2B and Letta. How we grade
Price against what you get
E2B starts at $150 a month and scores 2.0 out of 4 on features, ease of use and platforms. Letta starts at $20 a month and scores 2.0.
They score the same, and Letta starts $130 a month lower. Of the other AI agents on the chart, 55 score higher than E2B for less, and 17 score higher than Letta for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- Letta also covers workflow automation.
At a glance
| E2B | Letta | |
|---|---|---|
| Pricing | Free trial | Free plan |
| Starts at | $150 per month, plus per-second sandbox usage | $20 per month |
| Free plan | None | Up to 3 stateful agents and 5 MiB per memory repository; bring your own API keys or an external coding plan. |
| Free trial | Free Hobby tier with a one-time $100 usage credit, no credit card required. Credits do not renew. | None listed |
| Web | ||
| Made by | FoundryLabs, inc. (E2B) | Letta, Inc. |
| Price read from | e2b.dev | docs.letta.com |
| Checked | Nov 12, 2026 | Nov 12, 2026 |
Worth knowing
E2B
- Usage is billed separately from the plan: for example a default 2 vCPU sandbox costs $0.000028 per second and 4 GiB of memory $0.000018 per second.
- The free Hobby tier is a one-time $100 credit, not a renewing allowance, and caps sessions at 1 hour and 10 concurrent sandboxes.
- Going from 100 to 600 or 1,100 concurrent sandboxes adds $500 or $1,000 a month on top of Pro.
- It is infrastructure for developers: there is a web console but the product is used through the SDK and API.
Letta
- The free plan has no included model usage; you bring your own keys or buy credits.
- Credits are spent by model usage at provider-based rates, and the pricing page says heavy coding use can run $100 to $200 a month or more.
- Server-side tool time is billed at $0.00015 per second against credits, and web search and fetch tools also cost credits.
- Adding members to an organization needs Teams Pro; Pro covers a single user.
Key features
E2B
- Isolated sandbox per session
- Each agent session gets its own microVM with a shell, filesystem, network and an optional browser or desktop.
- Snapshots and pause
- Sandboxes start from a snapshot, and a sandbox can be paused and resumed from the same state.
- Python and JavaScript SDKs
- The sandbox is created and controlled from code with the e2b package for Python or npm.
- Bring your own cloud
- The same SDK works on E2B Cloud in the US, EU and APAC or inside your own AWS, GCP or Azure account.
- MCP tools inside the sandbox
- The site says more than 200 MCP servers can be called from inside a sandbox, and secrets are scoped per sandbox.
- Per-second usage billing
- Running sandboxes are charged by the second for vCPUs and memory, so cost follows run time and size.
Letta
- Persistent agent memory
- Agents are stateful: they carry memory across sessions, and memory repositories are versioned in git so changes can be tracked.
- Letta Code CLI
- An open-source harness installed with npm for coding agents, personal assistants and agents that work on local files, with skills and schedules.
- Agent SDK and app server
- Developers can embed stateful agents in their own applications, with a self-hosting option and a protocol for external tools.
- Channels and cloud agents
- Cloud-hosted agents connect to Slack and a GitHub integration; the channels guide also lists Telegram, Discord, WhatsApp and Signal.
- Bring your own keys
- All plans accept your own model API keys, and usage then goes through your provider account instead of using Letta credits.
Plans
E2B
Hobby$0
One-time $100 usage credit, sessions up to 1 hour, 10 concurrent sandboxes and the default sandbox CPU and RAM. Usage is charged against the credit.
Pro$150
per month, plus usage billed by the second
Sessions up to 24 hours, 100 concurrent sandboxes (expandable to 1,100 with add-ons at +$500 and +$1,000 a month) and custom sandbox CPU and RAM.
EnterpriseCustom
Committed usage, custom billing, multi-day sessions, bring-your-own-cloud. The page says it starts at a $2,000 monthly commit.
Letta
Free$0
per month
Up to 3 stateful agents; no included model usage, so bring your own keys or buy credits.
Pro$20
per month
Includes $20 of credits a month for any model and remote sandboxes, up to 20 stateful agents.
Teams Pro$20
per seat / month
Everything in Pro, plus teammates in an organization, shared agents and access control.
EnterpriseCustom
Volume-based pricing with role-based access control, SAML/OIDC SSO and dedicated support.
Ways to pay less
E2B
- Startups
$20,000 in credits and Pro for early-stage startups
A one-time $20,000 in credits plus the Pro tier for startups under three years old that have raised less than $5M.
Letta
No public discounts listed.
Common questions
Which is cheaper, E2B or Letta?
As of Nov 12, 2026, Letta is cheaper to start with: $20 a month, against $150 a month for E2B. E2B starts at $150 per month, plus per-second sandbox usage, and Letta starts at $20 per month.
Which has a free plan, E2B or Letta?
As of Nov 12, 2026, only Letta has a free plan. E2B does not, though it has a free trial.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.