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Claude Opus 5.5
Try Claude Opus 5.5 for long agentic runs: coding, research and automation tasks finish faster, with roughly 40% trimmed from the cost of each job.
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Built for Extended Runs: What Sets Claude Opus 5.5 Apart
It draws on less compute than its predecessor, explains its reasoning more plainly, and closes out sprawling multi-step jobs sooner.
- Cheaper by Roughly 40% on Everyday TasksStandard settings run at $4 per million input tokens and $20 per million output tokens, with cached reads at $0.20 — a steep drop from the previous generation.
- Answers Arrive Over 30% SoonerClaude Opus 5.5 streams tokens more than a third faster than the earlier model, and Fast mode inside Claude Code can push throughput up to 2.5x.
- Writing That Reads Like a Human Wrote ItIt opens with the conclusion, keeps explanations tight, and stays coherent across marathon sessions instead of slowly drifting off track.
Running Claude Opus 5.5: A Quick Walkthrough
Three simple moves get Claude Opus 5.5 handling code, research and unattended background work.
What Claude Opus 5.5 Can Do
The strengths that matter most: autonomous coding, large-scale migrations, prompt-injection resistance, research accuracy and leaner token use.
Top-Tier Autonomous Coding for Less
Scores land at 54.6% on FrontierCode and 52.5% on CursorBench, while each completed task costs far less than what competing models charge.
Large-Scale Refactors and Code Audits
One team moved 680,000 lines in a single day, and another repaired 200,000 lines in three hours — a job the earlier release needed 20 hours to finish.
Harder to Hijack with Malicious Prompts
Across coding, tool use and browsing scenarios Claude Opus 5.5 equals or exceeds its predecessor, and it matches Fable 5.1 on Gray Swan's injection benchmark.
Reliable Research and Knowledge Tasks
Sixteen of eighteen sample reports met the quality bar, and the model reaches 1846 Elo on GDPval-AA v2.1.
Finance and Business Workflows
Walleye Capital cleared its internal test suite at the model's lowest effort setting, and a merger model finished ahead of the previous version in 63 minutes.
Leaner Token Consumption
Lower per-token pricing combines with fewer tokens burned per job for an overall 40% reduction, and testers report wrapping up in half the turns.
Claude Opus 5.5: Questions Answered
Straight answers on what Claude Opus 5.5 costs, how quickly it responds, how safe it is to leave running, and who can get access.
What does Claude Opus 5.5 cost to use?
Pricing sits at $4 per million input tokens and $20 per million output tokens — 20% under the previous release — while cached reads cost $0.20. Most workloads end up around 40% cheaper overall.
How quickly does Claude Opus 5.5 respond?
Output streams more than 30% faster than the earlier version, and switching on Fast mode in Claude Code can lift that to roughly 2.5x.
Can Claude Opus 5.5 be trusted to run on its own?
It ranks first on our automated behavioral audit, and it is markedly less prone to irreversible actions or wandering past the boundaries it was given.
How does Claude Opus 5.5 stack up against Opus 5 and Fable 5.1?
On everyday work it performs on par with Fable 5.1 and clearly ahead of Opus 5; in practice the real-world gap is narrower than raw benchmark numbers imply.
Is Claude Opus 5.5 available for biology and cybersecurity research?
Approved laboratories can apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens up over the next few weeks.
Have subscription usage limits changed?
Yes — five-hour caps increase across Pro, Max, Team and seat-based Enterprise plans, and subscribers also get a rate-limit reset they can bank and spend whenever they like.
Run Your First Claude Opus 5.5 Job Today
Begin at roughly 40% less per task, with raised five-hour limits and a bankable rate-limit reset included for subscribers.