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What is an ACU?

Agent Compute Units (ACUs) are a measure of Devin’s work. The number of ACUs consumed within a session is based on:
  • Number and complexity of actions Devin takes in a given session including planning, required context gathering for the task, steps to complete the task, actions taken in browser, code execution, etc.
  • Virtual machine time and networking bandwidth (typically a small fraction of total ACU consumption)
Aside from the few ACUs required to keep the Devin VM running, Devin will not consume ACUs when:
  • Waiting for your response
  • Waiting for a test suite to run
  • Setting up and cloning repositories
When idle, Devin will go to sleep. You can wake up the session by sending Devin another message.
A few things you can do for 1 ACU:
  • find an old commit, bring back that feature, and modify the design
  • investigate a bug with Search, make a fix, and get CI to pass
  • make a simple personal website

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Managing my ACU budget

You can track ACU consumption and set limits for your Team under Settings > Usage & Limits. If you’re on the Core plan, all consumption is pay-as-you-go:
  • ACUs must be purchased to start using Devin. To buy more ACUs, go to the Usage & Limits page. Each ACU costs $2.25.
  • You can choose to set up auto-reload to purchase additional credits automatically. If you enable auto-reload, you can set the minimum ACU balance and the amount of ACUs to reload to your account (your “target balance”) if you hit that minimum balance.
For users on the Teams plan, your $500/month subscription includes:
  • 250 ACUs each month
  • You can choose to set up auto-reload to purchase additional credits automatically. If you enable auto-reload, you can set the minimum ACU balance and the amount of ACUs to reload to your account (your “target balance”) if you hit that minimum balance.
Depending on your selected plan, you’ll see different ACU types:
  • Subscription ACU: applied to your account if you have an active subscription. ACUs included in your subscription reset at the end of your billing cycle. These are only available as part of the Teams plan.
  • Gift ACU: these are credits granted by the Cognition team or credited upon referral. These never expire.
  • PAYG ACU: these are credits consumed on a pay-as-you-go basis. Unused PAYG ACUs never expire.
ACUs are consumed in the following order: subscription, PAYG, and gift ACUs. If you’re on the Core plan the PAYG ACUs will be consumed before gift ACUs. For more details about the Core vs. Teams plan visit https://devin.ai/pricing.

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Managing ACU consumption effectively

A number of variables can affect ACU consumption and costs:
  • Task complexity
  • Prompt quality (or specificity)
  • Size of context or codebase
  • Number of files being touched or modified
  • Session runtime
  • Length of conversation
  • Frequency of back and forth messaging
A few tips to keep ACU consumption under control:
  • Delegate clearly scoped tasks with a well-defined end goal
  • Keep prompts and sessions short
  • Avoid asking Devin to do a lot of different tasks in the same session
  • If you’re on the Teams plan, split big projects or tasks into sub-tasks across sessions. There are no concurrent session limits for Teams, so take advantage of this!
All these tips will also make Devin’s work higher quality so it’s a win-win!

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Frequently Asked Questions