Devin

Overview

Devin is an autonomous software engineer AI agent by Cognition AI. It executes end-to-end software tasks — opening PRs, running tests, and modernizing legacy code — the way a human engineer would, and the same agent is reachable from Web, Desktop, and CLI.

Key Features

1. Devin Fusion (multi-model harness)

Rather than pointing one expensive frontier model at every step, Fusion runs a frontier "main agent" alongside a cheap "sidekick" model, hands mechanical work to the sidekick, and switches models mid-task. It runs behind the scenes on the plan you already pay for, and Cognition reports up to 60% lower cost on its own benchmark.

2. SWE-1.7 (in-house coding model)

An in-house model trained from a Kimi K2.7 base with reinforcement learning for coding. Served via Cerebras at roughly 1,000 tokens/sec, it scores 81.5% on Terminal-Bench 2.1 and 77.8% on SWE-Bench Multilingual, and is available across Devin Web, Desktop, and CLI.

3. Interactive Planning and Parallel Sessions

Refine the plan collaboratively before work starts, and spin up multiple Devins to tackle different tasks concurrently.

4. Devin Search / Devin Wiki

Search and summarize across internal repositories to build an understanding of the codebase.

5. Devin Desktop

A code editor plus AI agent coordination environment. Agent Client Protocol (ACP) support lets Codex, Claude Agent, and other third-party agents run from the same interface.

6. Devin Security Swarm

Multiple Devin agents analyze code in parallel, detect vulnerabilities, validate each finding in an isolated sandbox, and open the patch PR.

7. Legacy Code Modernization

Ingests massive legacy codebases (COBOL, Fortran, Objective-C) and proposes or implements refactors into modern languages.

8. Visual Input Support

Consumes Figma designs, UI mockup images, and screen recordings to understand visual bugs and UI requirements.

Plans & Pricing

Plan	Monthly	Perks
Free	$0	Trial usage
Pro	$20	Individual use, SWE-1.7 included
Max	$200	Heavy usage allowance
Teams	$80 + $40/seat	Team features
Enterprise	Custom	VPC deployment, SAML SSO

Self-serve pricing is now four tiers — Free, Pro at $20, Max at $200, and Teams at an $80 base plus $40 per seat — with overage billed in ACUs. An ACU (Agent Compute Unit) is a normalized measure spanning VM run time, inference tokens, and networking — roughly 15 minutes of Devin actively working.

Typical Use Cases

• Automated bug fixes and PR creation
• Legacy code modernization
• Test generation and coverage improvement
• Vulnerability detection with patch PRs
• Converting specs and mockups into working code

Strengths

• Free tier to try, individual use from $20
• Parallel agents for multitasking
• Devin Fusion holds quality while cutting cost
• Handles large legacy codebases
• Accepts Figma and video as input

Weaknesses

• ACU consumption is hard to forecast
• Complex tasks still require human review

Official Links

• Website: https://devin.ai
• Pricing: https://devin.ai/pricing