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Claude Opus 5.5
Claude Opus 5.5 leads the new Claude 5.5 family: Fable 5.1-level results on most work at 40% less cost than Opus 5, with faster, clearer output.
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Why Claude Opus 5.5 Leads on Long, Multi-Step Work
Claude Opus 5.5 needs less compute than Opus 5, writes more clearly, and finishes sprawling agentic jobs faster.
- 40% Lower Cost per Typical WorkloadClaude Opus 5.5 needs less compute, so default settings cost 40% less: $4 input, $20 output, $0.20 cache reads.
- Output Generated 30% FasterClaude Opus 5.5 outputs more than 30% faster than Opus 5, and Fast mode adds up to 2.5x speed.
- More Natural, Clearer CommunicationClaude Opus 5.5 writes more clearly, leads with the key point, and makes a better long-session partner.
How to Use Claude Opus 5.5
Three steps to put Claude Opus 5.5 to work on coding, research, and long unattended jobs.
Claude Opus 5.5 Features
Where Claude Opus 5.5 stands out: agentic coding, migrations, injection defenses, research accuracy, and fewer tokens per task.
Frontier Agentic Coding at Lower Cost
Claude Opus 5.5 scores 54.6% on FrontierCode and 52.5% on CursorBench, at a fraction of rivals' cost per task.
Codebase-Wide Migrations and Audits
A tester migrated 680,000 lines in under a day; another fixed 200,000 lines in three hours where Opus 5 took 20.
Stronger Prompt Injection Defenses
Claude Opus 5.5 matches or beats Opus 5 on injection in coding, tool use, and browsing, tying Fable 5.1 on Gray Swan's test.
Research and Knowledge Work Accuracy
16 of 18 Claude Opus 5.5 reports cleared our quality bar; it also scores 1846 Elo on GDPval-AA v2.1.
Financial Analysis and Business Tasks
Walleye Capital saw Claude Opus 5.5 solve their suite at its lowest setting, and its merger model beat Opus 5 in 63 minutes.
Fewer Tokens per Task
Claude Opus 5.5 costs less per token and uses fewer per task, netting a 40% drop, with testers finishing in half the turns.
Claude Opus 5.5 — FAQ
Common questions and answers about Claude Opus 5.5 pricing, speed, safety, and access.
How much does Claude Opus 5.5 cost?
$4 input and $20 output per million tokens, 20% below Opus 5, with cache reads at $0.20; typical workloads run 40% cheaper.
How fast is Claude Opus 5.5?
It generates output more than 30% faster than Opus 5, and Fast mode in Claude Code reaches up to 2.5x speed.
Is Claude Opus 5.5 safe to run autonomously?
It tops our automated behavioral audit and is far less likely to take hard-to-reverse actions or step outside its given boundaries.
How does Opus 5.5 compare with Opus 5 and Fable 5.1?
It matches Claude Fable 5.1 on most work and is a major step up from Opus 5, with a narrower real-world gap than benchmarks suggest.
Can Opus 5.5 be used for biology and cybersecurity work?
Vetted labs can apply to the Life Sciences Verification Program now; Cyber Verification Program access expands in the coming weeks.
Are subscription usage limits changing?
Yes: five-hour limits rise on Pro, Max, Team, and seat-based Enterprise plans, plus a rate limit reset you can save and spend anytime.
Start With Claude Opus 5.5 Today
Start with Claude Opus 5.5 at 40% lower cost, with higher five-hour limits and a saveable rate limit reset for subscribers.