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Claude Opus 5.5
Explore Claude Opus 5.5, the flagship Claude 5.5 model built for agentic coding, deep research, and long autonomous runs — around 40% cheaper per task.
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Claude Opus 5.5 Handles the Jobs Nobody Wants to Babysit
It sips compute where Opus 5 gulps it, explains itself in plainer language, and closes out sprawling agentic jobs well before the clock runs out.
- Roughly 40% Cheaper per Typical TaskBecause Claude Opus 5.5 consumes fewer compute cycles, defaults land 40% lighter on your bill: $4 input, $20 output, $0.20 cache reads.
- Output Streams 30%+ FasterClaude Opus 5.5 produces responses more than 30% quicker than Opus 5, and switching on Fast mode pushes throughput to as much as 2.5x.
- Clearer, More Human-Sounding AnswersClaude Opus 5.5 puts the conclusion first, trims the jargon, and stays coherent across marathon working sessions.
Getting Started With Claude Opus 5.5
Three quick moves take Claude Opus 5.5 from setup to shipping code, research, and unattended workloads.
What Claude Opus 5.5 Does Best
The areas where Claude Opus 5.5 pulls ahead: agentic coding, large-scale migrations, injection resistance, research precision, and leaner token use.
Top-Tier Agentic Coding, Smaller Bill
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while charging a fraction of what rivals do per task.
Migrations and Audits Across Whole Codebases
One tester moved 680,000 lines in a single day; another repaired 200,000 lines in three hours, a job Opus 5 needed 20 hours for.
Harder to Hijack With Prompt Injection
Against injection attempts in coding, tool use, and browsing, Claude Opus 5.5 equals or surpasses Opus 5 and matches Fable 5.1 on Gray Swan's test.
More Reliable Research and Knowledge Work
16 of 18 reports produced with Claude Opus 5.5 cleared our quality bar, and it lands 1846 Elo on GDPval-AA v2.1.
Financial Analysis and Business Tasks
Walleye Capital watched Claude Opus 5.5 clear their test suite at its lowest setting, and its merger model beat Opus 5 in 63 minutes.
Leaner Token Consumption
Cheaper tokens plus fewer of them per task add up to a 40% drop, and testers reached completion in roughly half the turns.
Claude Opus 5.5: Frequently Asked Questions
Answers to the questions people ask most about Claude Opus 5.5 — pricing, response speed, autonomous safety, and how to get access.
What does Claude Opus 5.5 cost to run?
$4 per million input tokens and $20 per million output tokens, 20% under Opus 5, with cache reads at $0.20. Most workloads end up about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output arrives over 30% faster than Opus 5, and Fast mode inside Claude Code can push that to 2.5x.
Can I let Claude Opus 5.5 run on its own?
It ranks first on our automated behavioral audit and is markedly less prone to irreversible actions or wandering past the boundaries you set.
How does Claude Opus 5.5 stack up against Opus 5 and Fable 5.1?
On most tasks it keeps pace with Claude Fable 5.1 and clearly outpaces Opus 5, and in real use the margin is even tighter than benchmarks imply.
Is Claude Opus 5.5 available for biology or cybersecurity work?
Verified labs can apply for the Life Sciences Verification Program today, while Cyber Verification Program slots open up over the next few weeks.
Will subscription usage limits change?
They will. Five-hour caps go up on Pro, Max, Team, and seat-based Enterprise plans, and you also get a rate limit reset you can bank and spend anytime.
Put Claude Opus 5.5 to Work Today
Get going with Claude Opus 5.5 at roughly 40% lower cost, plus higher five-hour caps and a bankable rate limit reset for subscribers.