Cognition's SWE-2 Coding Model Now in Devin

Melvin Vivas · X post · 2026-09-11 · Open on X

Topics: AI Dev Tools & Productivity, LLM Fundamentals · Level: beginner

Summary

Announcement of SWE-2, Cognition's best coding model so far. It scores within one point of Fable 5.1 on the FrontierCode benchmark at 64% less cost. It is free in Devin CLI and Devin Desktop and 75% off in Devin Cloud.

Key points

• SWE-2 is Cognition's newest and best coding model, built for real software engineering work.
• It scores within 1 point of Fable 5.1 on FrontierCode at 64% lower cost.
• It is free in Devin CLI and Devin Desktop and 75% off in Devin Cloud.
• When choosing a coding model, compare cost against benchmark score, not just the top score.

Resources mentioned

• SWE-2 · tool · cognition.com · free
  Cognition's SWE-2 coding model (Max tier) that runs inside Devin for agentic software tasks.
  Also in: Comparing Coding Models on the Same Task in Devin iOS (Melvin Vivas on X · notes), Devin's SWE-2 Coding Model Is Free for a Limited Time (Until Oct 8/15) (Melvin Vivas on X · notes), Devin's SWE-2 model is free on paid plans for a limited time (Melvin Vivas on X · notes), Using Devin CLI with the free SWE-2 model for sysadmin tasks (Melvin Vivas on X · notes) and 8 more
• Devin · tool · x.com · paid
  A desktop app from the makers of the Devin coding agent for planning, delegating, reviewing and shipping work across fleets of local and cloud coding agents.
  Also in: Using the Devin iOS App to Build iOS Apps (Quick Demo) (Melvin Vivas on X · notes), Use Your ChatGPT Plus/Pro Subscription to Run Devin (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes), Devin price cuts and top score on FrontierCode 1.1 Extended (Melvin Vivas on X · notes) and 44 more
• FrontierCode · other · cognition.com · free
  Coding benchmark used to compare SWE-2 with other models.
• Fable · tool · anthropic.com · paid
  Named as what the creator used with Devin for this build; the post gives no details about what it is.
  Also in: Demo: One-Shotting a Flappy Bird iPhone App with Devin and Fable 5.1 (Melvin Vivas on X · notes), Subagents with mixed models: a strong planner and a fast executor (Melvin Vivas on X · notes), GPT-6 Astra Access Across Plans vs Fable on Claude Max (Melvin Vivas on X · notes), Cutting AI Coding Costs by Routing Most Work to Commodity Models (Melvin Vivas on X · notes) and 10 more

Try this

• Try SWE-2 for free in Devin CLI or Devin Desktop.