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Claude Opus 5.5
Explore Claude Opus 5.5 — an advanced model tuned for autonomous coding, in-depth research and extended workflows, at roughly 40% lower cost per task.
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Why Teams Choose Claude Opus 5.5 for Extended Agentic Jobs
It burns less compute than the previous generation, communicates with greater clarity, and carries sprawling autonomous jobs through to completion.
- About 40% Cheaper on Everyday WorkloadsBecause the model sips less compute, standard settings land at $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Responses Arrive 30% SoonerToken generation outpaces the earlier release by more than 30%, and switching on Fast mode pushes throughput as high as 2.5x.
- Clearer, More Human-Sounding WritingAnswers open with the headline, prose reads cleanly, and the model holds its coherence across very long sessions.
Getting Started With Claude Opus 5.5
Three quick moves take you from setup to shipping with Claude Opus 5.5 on coding, research and unattended runs.
What Claude Opus 5.5 Brings to the Table
Standout strengths include autonomous coding, large-scale migrations, prompt-injection defenses, research precision and leaner token use.
Top-Tier Autonomous Coding, Lower Spend
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench, achieved for a fraction of what rival models charge per job.
Whole-Repository Migrations and Audits
One early user moved 680,000 lines in a single day; another repaired 200,000 lines in three hours, a job the older Opus 5 needed 20 hours for.
Hardened Against Prompt Injection
Across coding, tool use and browsing, resistance equals or exceeds the prior version and matches Fable 5.1 on Gray Swan's benchmark.
Precise Research and Knowledge Tasks
Sixteen of eighteen Claude Opus 5.5 reports met our internal quality bar, alongside an 1846 Elo rating on GDPval-AA v2.1.
Finance and Business Deliverables
Walleye Capital cleared its full evaluation suite at the lowest effort setting, and a merger model finished ahead of Opus 5 within 63 minutes.
Leaner Token Consumption
Cheaper per token and more economical per job, the two effects compound into a 40% saving, with some testers wrapping up in half the turns.
Claude Opus 5.5: Frequently Asked Questions
Answers to the questions people ask most about Claude Opus 5.5 cost, throughput, safety guardrails and how to get access.
What does it cost to run Claude Opus 5.5?
Input is billed at $4 and output at $20 per million tokens — a fifth below Opus 5 — while cache reads cost $0.20. Real-world jobs typically land around 40% cheaper.
How quickly does it respond?
Output streams more than 30% faster than the previous generation, and Fast mode inside Claude Code can push that to 2.5x.
Can I leave Claude Opus 5.5 running on its own?
It ranks first in our automated behavioral audit, and it is far 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 most tasks it keeps pace with Fable 5.1 while improving substantially on Opus 5 — and the practical difference is smaller than raw benchmark gaps imply.
Is it available for biology and cybersecurity projects?
Screened laboratories can apply to the Life Sciences Verification Program today, and Cyber Verification Program slots open up over the next few weeks.
Will subscription limits change?
Yes — five-hour caps increase across Pro, Max, Team and seat-based Enterprise tiers, and a rate-limit reset can now be banked and spent whenever you like.
Try Claude Opus 5.5 on Your Next Task
Get going with roughly 40% lower spend per task, larger five-hour allowances and a bankable rate-limit reset for subscribers.