The arena · AI coding assistant review
Devin
by Cognition
Cognition's autonomous cloud engineer, down 90% from $500 to a $20/mo entry: it plans, codes, tests and opens PRs on its own
From $20/mo
Official tiers: Free $0, Pro $20/mo, Max $200/mo, Teams $80/mo base plus $40 per full developer seat, Enterprise custom; usage quotas refresh daily and weekly, with extra usage at API pricing (legacy pay-as-you-go billed ACUs at $2.25, one ACU being ~15 min of agent work). Verified against devin.ai/pricing 2026-07.
Cognition
Free plan: light agent quota, limited models, unlimited Tab completions and inline edits in Devin Desktop
Cloud agent
Yes
No
Yes
What is Devin?
Devin is Cognition's autonomous cloud software engineer, launched in March 2024 as the first 'AI software engineer' and heavily iterated since. It runs in its own cloud VM, plans multi-step tasks, writes and tests code, browses docs and opens pull requests with minimal supervision. After acquiring Windsurf, Cognition rebranded the IDE to Devin Desktop in June 2026, pairing the cloud agent with a fast local agent (Devin Local, SWE-1.5 model) in one product.
Devin pros & cons
Pros
- True end-to-end autonomy: give it a Linear ticket or Slack message and it plans, codes, runs tests and opens a PR from its own cloud VM, in parallel sessions
- Entry price collapsed from $500/mo at launch to $20/mo (Pro), making the strongest autonomous agent accessible to individuals
- Devin Desktop (the former Windsurf IDE, rebranded 2026-06-02) bundles a local agent with subagents plus Tab completions, so one subscription covers IDE work and cloud tasks
- SWE-1.5 in-house model serves fast local edits at roughly 950 tokens/second, reportedly far faster than routing everything through frontier APIs
- Pro plan includes access to OpenAI, Claude and Gemini frontier models, not just Cognition's own
- Teams report reliable wins on well-scoped work: internal dashboards, migration scripts and test suites that save hours of boilerplate per task
Cons
- Usage costs are the trap: quotas refresh daily/weekly and complex tasks burn through them fast; under the legacy ACU system ($2.25 per ~15 min of work) a medium task ran $22-56, and heavy users report real spend drifting toward $300-500/mo
- The 2024 launch demos were partly debunked (Upwork tasks simpler than portrayed), and it still overreaches: on vague or novel problems it can iterate expensively toward a wrong solution
- No long-term memory across sessions; its grasp of your codebase is bounded by what fits in one session's context
- Pricing structure has churned repeatedly (Core, Team, ACUs, now Free/Pro/Max/Teams), making cost forecasting genuinely hard
- Closed source and cloud-first: your code runs in Cognition's VMs, a non-starter for some compliance regimes
The arena’s verdict
Buy Devin if you have a backlog of well-scoped, verifiable tasks and want them done in the background while you work: at $20/mo entry it is the most complete autonomous engineer you can hire, and the Windsurf-derived Devin Desktop makes the package genuinely daily-drivable. Budget realistically though: the sticker price is not the real price, and heavy delegation can push spend toward $300-500/mo. Avoid it if you mainly want interactive pair programming, where Claude Code or Cursor give more control per dollar, or if code leaving your infrastructure is a dealbreaker. Skip the Free tier for anything serious; its quota is demo-sized.
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What the crowd says
“Watch your usage dashboard like a hawk. One gnarly refactor ate my whole weekly quota and it STILL got the edge cases wrong. Great for boilerplate, do not trust it with anything novel.”
“The Windsurf merge actually made this good. Local agent for quick edits, cloud Devin for the long tasks, one bill. Did not expect Cognition to pull that off.”
“Fed it our Jira backlog of small bugs and it cleared 9 of 12 with mergeable PRs in a weekend. The 3 failures were tickets a junior would have botched too. Worth the $20 easily.”
Devin: frequently asked questions
Is Devin free?
Devin offers a free tier (Free plan: light agent quota, limited models, unlimited Tab completions and inline edits in Devin Desktop). Paid plans start at $20/mo.
How much does Devin cost?
Devin starts at $20/mo (freemium). Official tiers: Free $0, Pro $20/mo, Max $200/mo, Teams $80/mo base plus $40 per full developer seat, Enterprise custom; usage quotas refresh daily and weekly, with extra usage at API pricing (legacy pay-as-you-go billed ACUs at $2.25, one ACU being ~15 min of agent work). Verified against devin.ai/pricing 2026-07.