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Claude Opus 5.5
Run Claude Opus 5.5 for agentic coding, research, and long unattended jobs — about 40% cheaper per task and over 30% faster output.
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Claude Opus 5.5: A Stronger Partner for Extended Tasks
It burns less compute than Opus 5, explains itself in plainer language, and carries sprawling agentic jobs through to completion.
- Roughly 40% Cheaper on Everyday WorkloadsBecause Claude Opus 5.5 sips less compute, standard settings land near $4 per million input tokens, $20 for output, and $0.20 for cached reads.
- Output That Arrives 30% SoonerResponses stream out over 30% quicker than Opus 5, and switching on Fast mode can push that toward 2.5x.
- Plain, Natural-Sounding WritingClaude Opus 5.5 puts the conclusion first, keeps phrasing readable, and stays coherent across very long sessions.
Getting Claude Opus 5.5 Running in Three Steps
Set the effort level, hand over a big job, then review the result before it ships.
What Claude Opus 5.5 Does Best
Agentic coding, codebase migrations, prompt-injection defense, research accuracy, and leaner token use — the areas where Claude Opus 5.5 pulls ahead.
Top-Tier Agentic Coding, Lower Bill
On FrontierCode it reaches 54.6% and on CursorBench 52.5%, while each finished task costs far less than competing models.
Whole-Codebase Migrations and Audits
One early user moved 680,000 lines in a single day, and 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 equals or surpasses Opus 5, and it drew level with Fable 5.1 on Gray Swan's benchmark.
More Accurate Research and Knowledge Work
Sixteen of eighteen reports produced by Claude Opus 5.5 passed our quality bar, and it lands at 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched Claude Opus 5.5 clear their test suite on its lowest setting, and its merger model finished 63 minutes ahead of Opus 5.
Leaner Token Usage per Task
Cheaper tokens plus fewer of them per job add up to a 40% saving, and testers often wrapped up in half as many turns.
Claude Opus 5.5: Frequently Asked Questions
Answers to the questions people ask most about Claude Opus 5.5 — what it costs, how fast it runs, how safe it is, and who can use it.
What does Claude Opus 5.5 cost to run?
Expect $4 per million input tokens and $20 per million output tokens — 20% under Opus 5 — plus $0.20 for cached reads. Real workloads usually land about 40% cheaper.
How fast does Claude Opus 5.5 respond?
Output arrives over 30% quicker than Opus 5, and turning on Fast mode inside Claude Code can lift that to about 2.5x.
Can I leave Claude Opus 5.5 running on its own?
It ranks first in 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?
On most tasks it keeps pace with Claude Fable 5.1 while clearly outpacing Opus 5, and the practical difference feels smaller than raw benchmark numbers imply.
Is Claude Opus 5.5 available for biology or cybersecurity projects?
Screened labs may apply to the Life Sciences Verification Program right away, and access through the Cyber Verification Program opens wider within a few weeks.
Will my subscription limits change?
Yes — five-hour caps go up on Pro, Max, Team, and seat-based Enterprise plans, and you get a rate-limit reset you can bank and use whenever you like.
Put Claude Opus 5.5 to Work Today
Begin with Claude Opus 5.5 at roughly 40% lower cost, plus higher five-hour limits and a bankable rate-limit reset for subscribers.