Claude Opus 5.5 in Devin: #1 on FrontierCode 1.1

Melvin Vivas · X post · 2026-09-23 · Open on X

Topics: AI Dev Tools & Productivity, Industry Trends & Job Market · Level: beginner

Summary

Claude Opus 5.5 is now available in Devin. On the FrontierCode 1.1 benchmark it takes the #1 spot from Fable 5, at a fraction of the cost.

Key points

• Claude Opus 5.5 is available in the Devin coding agent.
• It ranks #1 on FrontierCode 1.1, overtaking Fable 5.
• It costs a fraction of what Fable 5 does.

Resources mentioned

• 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
• Claude Opus 5.5 · tool · claude.ai · paid · open in a browser to verify · recommended by both Bashiri Smith & Melvin Vivas
  Anthropic's AI assistant, used throughout the guide to tailor resumes, add live roles to the tracker, match connections to target companies and find hiring managers.
  Also in: Generating a Repo Promo Video with a Claude Skill on Sonnet 5.5 vs Opus 5.5 (Melvin Vivas on X · notes), Comparing Coding Models on the Same Task in Devin iOS (Melvin Vivas on X · notes), Customizing Your Coding Setup with Pi Coding Agent Extensions (Melvin Vivas on X · notes), AI Engineer Roadmap Overview: From ML Foundations to RAG, Agents & Ops (Bashiri Smith on Facebook · notes) and 53 more
• FrontierCode 1.1 · other · cognition.com · free
  A coding benchmark used to compare frontier models.
  Also in: GPT-6 Astra Coming to Devin: Benchmark and Cost Claims (Melvin Vivas on X · notes)
• Fable 5 · tool · anthropic.com · paid
  A frontier model used as the comparison point in the Claude Opus 5 announcement; the post gives no other details about it.
  Also in: Creator's Top 3 Closed Models: Fable 5, GPT 5.6 Sol, Grok 4.6 (Melvin Vivas on X · notes), Opus 5 vs Fable 5: Cost per Task in Cursor Benchmarks (Melvin Vivas on X · notes), Opus 5 Beats Fable 5 on Cost per Task and Tokens (Melvin Vivas on X · notes), Claude Opus 5 Release: Anthropic's New Model Announced (Melvin Vivas on X · notes) and 7 more