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Claude Opus 5.5
Put Claude Opus 5.5 through coding marathons, deep research, and unattended workflows — sharp writing, quick replies, and lighter compute bills.
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How Claude Opus 5.5 Handles Work That Spans Hours, Not Minutes
Lower compute draw, tighter prose, and quicker turnarounds let Claude Opus 5.5 carry sprawling agentic projects through to the finish.
- Roughly 40% Trimmed From Routine WorkloadsBecause it draws less compute, standard settings land at $4 per million input tokens, $20 output, and $0.20 for cache reads — about 40% below Opus 5.
- Replies That Land 30% SoonerClaude Opus 5.5 streams answers more than 30% faster than its predecessor, and Fast mode inside Claude Code can push that to 2.5x.
- Prose That Gets Straight to the PointExpect plain, well-organized writing that states the conclusion first and holds up across marathon working sessions.
How to Put Claude Opus 5.5 to Work
A short walkthrough for running Claude Opus 5.5 on code, research, and jobs you can leave unattended overnight.
What Claude Opus 5.5 Brings to the Table
Standout strengths of Claude Opus 5.5 include agentic coding, large-scale migrations, prompt-injection defenses, research accuracy, and leaner token use.
Agentic Coding That Costs Less per Task
Scores of 54.6% on FrontierCode and 52.5% on CursorBench put Claude Opus 5.5 near the front, while each finished task costs far less than rival models.
Migrations and Audits Across Entire Codebases
One team 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, Claude Opus 5.5 meets or exceeds Opus 5 on injection resistance and draws level with Fable 5.1 on Gray Swan's benchmark.
Accurate Research and Knowledge Work
Sixteen of eighteen reports produced with Claude Opus 5.5 passed our quality bar, and the model reaches 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital found Claude Opus 5.5 cleared their test suite at its lowest setting, and a merger model built with it beat Opus 5 in 63 minutes.
Leaner Token Consumption
Cheaper tokens plus fewer of them per job add up to roughly 40% savings, and testers wrapped tasks in half the turns.
Claude Opus 5.5: Your Questions Answered
Straight answers on what Claude Opus 5.5 costs, how fast it responds, how safely it runs unattended, and who can access it.
What does Claude Opus 5.5 cost to run?
Input is $4 and output $20 per million tokens — 20% under Opus 5 — with cache reads at $0.20, so a typical workload lands about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output arrives more than 30% faster than Opus 5, and Fast mode in Claude Code can lift throughput to 2.5x.
Can I let Claude Opus 5.5 run unattended?
It ranks first in our automated behavioral audit and is markedly less prone to irreversible actions or drifting past assigned boundaries.
How does it stack up against Opus 5 and Fable 5.1?
On most tasks it trades blows with Claude Fable 5.1 and clearly surpasses Opus 5; real-world gains run wider than benchmark gaps imply.
Is Claude Opus 5.5 available for biology or security research?
Vetted labs can apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens up over the coming weeks.
Will subscription usage limits change?
Yes — five-hour caps rise for Pro, Max, Team, and seat-based Enterprise plans, and you get a rate limit reset you can bank and spend whenever you like.
Give Claude Opus 5.5 Your Next Big Job
Spin up Claude Opus 5.5 for about 40% less, with larger five-hour allowances and a bankable rate limit reset on paid plans.