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Claude Opus 5.5
Claude Opus 5.5 keeps long coding, browsing and analysis jobs on track for hours — with sharper answers at a fraction of the usual spend.
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Built to Stay Sharp Through Hours of Work
Less compute, clearer writing and quicker finishes on sprawling agentic jobs — that is what sets Claude Opus 5.5 apart.
- About 40% Less Spend per TaskBecause the model burns less compute, everyday runs land near $4 input, $20 output and $0.20 for cache reads per million tokens.
- Over 30% Quicker ResponsesClaude Opus 5.5 returns answers more than 30% faster than Opus 5, and Fast mode inside Claude Code can push that to 2.5x.
- Writing That Gets to the PointAnswers open with the conclusion, read more naturally, and hold up well across lengthy back-and-forth sessions.
Getting Started With Claude Opus 5.5
Three quick moves take you from setup to handing off real coding, research and overnight work.
What Claude Opus 5.5 Does Best
From large-scale migrations to injection defense and research accuracy, these are the areas where Claude Opus 5.5 pulls ahead.
Top-Tier Agentic Coding, Lower Bills
It lands 54.6% on FrontierCode and 52.5% on CursorBench while spending a fraction of what rival models cost per task.
Whole-Codebase Migrations and Audits
One tester moved 680,000 lines in under a day; another repaired 200,000 lines in three hours, a job that took Opus 5 twenty.
Tougher Defenses Against Prompt Injection
Claude Opus 5.5 matches or beats Opus 5 across coding, tool use and browsing, and ties Fable 5.1 on Gray Swan's evaluation.
Reliable Research and Knowledge Work
16 of 18 reports produced by Claude Opus 5.5 cleared our quality bar, and it posts 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched Claude Opus 5.5 solve their full suite at its lowest setting, and its merger model beat Opus 5 in 63 minutes.
Leaner Token Usage per Task
A lower price per token plus fewer tokens per job adds up to a 40% reduction, with testers wrapping up in half the turns.
Claude Opus 5.5: Questions Answered
Straight answers on what Claude Opus 5.5 costs, how fast it runs, how safe it is unattended, and how to get access.
What does Claude Opus 5.5 cost to run?
Input is $4 and output $20 per million tokens — 20% under Opus 5 — while cache reads sit at $0.20; most workloads end up about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output arrives more than 30% faster than Opus 5, and Fast mode in Claude Code can reach roughly 2.5x the usual speed.
Can I let Claude Opus 5.5 run unattended?
It ranks first in our automated behavioral audit and is far less likely to take irreversible actions or drift past the boundaries you set.
How does it stack up against Opus 5 and Fable 5.1?
On most tasks it performs at Claude Fable 5.1 level and clearly outpaces Opus 5, though the real-world gap is narrower than benchmarks imply.
Is Claude Opus 5.5 available for biology or cybersecurity work?
Vetted labs can apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens up over the coming weeks.
Will subscription usage limits change?
Yes — five-hour caps rise across Pro, Max, Team and seat-based Enterprise plans, and you get a rate limit reset you can bank and spend whenever you like.
Begin Your First Claude Opus 5.5 Run
Kick off a task with Claude Opus 5.5 at roughly 40% less spend, plus higher five-hour caps and a bankable rate limit reset on paid plans.