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Claude Opus 5.5
Claude Opus 5.5 pairs flagship-grade reasoning with leaner token use, letting long coding and research jobs finish sooner and cost far less.
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Built for Marathon Tasks: What Sets Claude Opus 5.5 Apart
Fewer tokens, sharper prose and quicker turnarounds — Claude Opus 5.5 was tuned for workloads that stretch across hours.
- Everyday Runs Cost About 40% LessBecause Claude Opus 5.5 burns fewer tokens, standard settings land at $4 input, $20 output and $0.20 per million cached reads.
- Noticeably Quicker ResponsesStreaming speed improves by over 30% versus Opus 5, and Fast mode inside Claude Code can push that toward roughly 2.5x.
- Answers That Get to the PointClaude Opus 5.5 opens with the conclusion, keeps its prose readable, and holds context better across marathon sessions.
Getting Started with Claude Opus 5.5
Three quick moves take you from first setup to shipping real work with Claude Opus 5.5.
What Claude Opus 5.5 Does Best
Agentic coding, large-scale migrations, injection resistance, research precision and leaner token usage — the strengths that define Claude Opus 5.5.
Top-Tier Coding Agents, Smaller Bills
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while keeping cost per task well below competing models.
Whole-Repository Migrations in Hours
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.
Harder to Hijack with Prompt Injection
Across coding, tool use and browsing, this model matches or exceeds Opus 5 and ties Fable 5.1 on Gray Swan's evaluation.
Research You Can Actually Trust
Sixteen of eighteen Claude Opus 5.5 reports cleared our quality bar, and it earned 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched it solve their 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 job cut spend by 40%, and testers wrapped up their work in 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?
Input is $4 and output $20 per million tokens — 20% under Opus 5 — with cached reads at $0.20, so typical workloads land around 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output streams more than 30% faster than Opus 5, and Fast mode inside Claude Code can reach up to 2.5x speed.
Is it safe to let this model run on its own?
It came first in our automated behavioral audit and is far less prone to irreversible actions or drifting past the boundaries it was given.
How does Claude Opus 5.5 stack up against Opus 5 and Fable 5.1?
On most tasks it equals Claude Fable 5.1 and clearly outperforms Opus 5, though the real-world gap is narrower than benchmark charts imply.
Can Claude Opus 5.5 be used for biology and cybersecurity work?
Approved 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.
Put Claude Opus 5.5 to Work Now
Get going with Claude Opus 5.5 at roughly 40% less cost per task, plus higher five-hour ceilings and a bankable rate limit reset for subscribers.