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Claude Opus 5.5
Claude Opus 5.5 pairs near-flagship accuracy with a 40% lighter bill, faster replies, and steadier long-run agent behavior.
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What Makes Claude Opus 5.5 Different on Multi-Hour Tasks
It draws on fewer compute resources than Opus 5, communicates with greater clarity, and wraps up sprawling agent workflows sooner.
- Roughly 40% Off Typical WorkloadsBecause it consumes less compute, everyday use lands at $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Replies Arrive Over 30% SoonerToken generation outpaces Opus 5 by more than 30%, and Fast mode inside Claude Code can push throughput up to 2.5x.
- Wording That Reads NaturallyAnswers open with the point that matters, prose stays crisp, and the model holds context better across extended sessions.
Running Claude Opus 5.5: A Quick Walkthrough
Follow three simple stages to apply Claude Opus 5.5 to code, research, and jobs that run unattended for hours.
What Claude Opus 5.5 Brings to the Table
The areas where Claude Opus 5.5 pulls ahead: coding agents, large migrations, prompt-injection defenses, research precision, and leaner token use.
Top-Tier Coding Agents, Smaller Bills
It posts 54.6% on FrontierCode and 52.5% on CursorBench while spending far less per completed task than competing models.
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.
Hardened Against Prompt Injection
Across coding, tool use, and browsing, it equals or beats Opus 5, and it ties Fable 5.1 on Gray Swan's evaluation.
Reliable Research and Knowledge Work
16 of 18 generated reports met our quality bar, and the model earned 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched it clear their test suite at the lowest setting, and its merger model beat Opus 5 in 63 minutes.
Leaner Token Consumption
Lower cost per token plus fewer tokens per task nets about a 40% reduction, with testers wrapping up in half the turns.
Claude Opus 5.5 FAQ: Pricing, Speed, Safety
Straight answers on what Claude Opus 5.5 costs, how quickly it responds, its safety record, and who can access it.
What does Claude Opus 5.5 cost to run?
Input runs $4 and output $20 per million tokens — 20% under Opus 5 — while cache reads cost $0.20, so most workloads land about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Generation speed is over 30% higher than Opus 5, and switching on Fast mode in Claude Code lifts it as much as 2.5x.
Can I leave Claude Opus 5.5 running on its own?
It ranks first in our automated behavioral audit and is markedly less prone to irreversible actions or drifting past the boundaries it was given.
How does it stack up against Opus 5 and Fable 5.1?
On everyday work it keeps pace with Claude Fable 5.1 and improves substantially on Opus 5, with a smaller real-world gap than raw benchmarks imply.
Is it available for biology and cybersecurity projects?
Verified labs can already apply to the Life Sciences Verification Program, and Cyber Verification Program access opens wider in the coming weeks.
Do subscription limits change with this release?
They do: five-hour caps rise across Pro, Max, Team, and seat-based Enterprise plans, and you get a rate limit reset you can bank and use whenever you like.
Try Claude Opus 5.5 Now
Get going with Claude Opus 5.5 at roughly 40% lower cost, plus larger five-hour allowances and a bankable rate limit reset on paid plans.