LMArena (@arena) said Anthropic’s Claude Fable 5.1 is now live for Arena voting, with scores coming soon. Agent Arena measures long-horizon real-world agent tasks where models can use web search, filesystem, and terminal tools; Fable 5.1 is also in Code Arena WebDev, Text, Vision, and Document.

Key Takeaways

  • ✓Fable 5.1 is live for public Arena voting; official scores pending.
  • ✓Agent Arena targets long-horizon workflows with search, filesystem, and terminal tools.
  • ✓Also listed across Code Arena WebDev, Text, Vision, and Document.
⚡

Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
Fable 5.1 is live for public Arena voting; official scores pending.
Full Leaderboard→
💰 Cost & PlansCompare
in: $10 / out: $50
Compare Plans↗
🛠️ Ecosystem & IDERules
Claude Code (Anthropic) · Cursor Composer (Agent Mode)
Setup IDE Rules↗
🧭

Heavy Claude Code use: compare subscription limits and API bills

Compare 40 dev plans & simulate token costs vs $20/mo subscriptions

⚔️ Compare Model→💰 Compare plans & limits↗
Action HubReady to adopt this in production?

Benchmark side-by-side against alternatives, or calculate monthly token cost vs subscription break-even.

⚔️ Launch VS Compare→💳 View Plans↗
Up NextLMArena: Claude Fable 5.1 (Max) #1 on Agent Arena (+15.8% net) at $4.14 median cost/task
Read Now→