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Claude Opus 5.5
Claude Opus 5.5 brings top-tier agentic coding and research to demanding jobs, answering faster and spending far fewer tokens per task.
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Claude Opus 5.5: Engineered for Work That Runs for Hours
It consumes fewer tokens than Opus 5, explains its reasoning more plainly, and wraps up sprawling agentic jobs sooner.
- Roughly 40% Cheaper on Everyday WorkloadsBecause Claude Opus 5.5 burns less compute, default settings land 40% cheaper — $4 per million input tokens, $20 output, $0.20 for cache reads.
- Replies Arrive Over 30% SoonerToken streaming outpaces Opus 5 by more than 30%, and switching into Fast mode can push throughput as high as 2.5x.
- Plain-Language Answers That Stay on PointExpect the headline first, less filler around it, and a collaborator that holds context well across marathon sessions.
Getting Started With Claude Opus 5.5
Three quick moves take Claude Opus 5.5 from setup to shipping code, research, and overnight runs.
What Claude Opus 5.5 Does Best
The strengths that show up in daily use: agentic coding, large-scale migrations, prompt-injection defense, research accuracy, and leaner token usage.
Top-Tier Agentic Coding, Leaner Bills
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while spending far less per completed task than competing models.
Migrations Across an Entire Codebase
One team moved 680,000 lines in a single 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, Claude Opus 5.5 holds or improves on Opus 5 and ties Fable 5.1 in Gray Swan's evaluation.
Research Output You Can Actually Cite
Sixteen of eighteen Claude Opus 5.5 reports met our quality bar, and the model scores 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital found Claude Opus 5.5 solved their suite at its lowest setting, and a merger model finished ahead of Opus 5 in 63 minutes.
Leaner Token Spend per Task
Cheaper tokens plus fewer of them per job compound into a 40% drop, and testers reached done in about half the turns.
Claude Opus 5.5: Questions Answered
Straight answers on what Claude Opus 5.5 costs, how quickly it responds, how safely it runs alone, and who can get access.
What does Claude Opus 5.5 cost to run?
Expect $4 per million input tokens and $20 per million output, about 20% under Opus 5, with cache reads at $0.20 — and most workloads land roughly 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.
Can I let Claude Opus 5.5 run on its own?
It leads our automated behavioral audit and is much 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?
Claude Opus 5.5 sits close to Fable 5.1 across the board and clearly ahead of Opus 5, though the real-world gap is narrower than benchmark tables imply.
Is biology or cybersecurity work supported?
Vetted labs can apply to the Life Sciences Verification Program now, and Cyber Verification Program access opens up over 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 spend whenever you like.
Put Claude Opus 5.5 to Work Now
Spin up Claude Opus 5.5 at 40% lower cost, with higher five-hour limits and a bankable rate limit reset for subscribers.