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Claude Opus 5.5
Claude Opus 5.5 is a frontier agentic model for long coding runs and deep research — sharper answers, leaner token use, and far lower cost per task.
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Built for Jobs That Run for Hours, Not Minutes
Fewer resources go into every answer, the prose is easier to follow, and sprawling multi-step tasks reach the finish line sooner.
- A Lighter Bill on Everyday WorkloadsDefault settings on Claude Opus 5.5 draw far less compute: $4 input, $20 output, and $0.20 cached reads, roughly 40% below Opus 5.
- Answers Arrive Over 30% SoonerText streams out more than 30% quicker than Opus 5, and switching on Fast mode can push that as high as 2.5x.
- Prose That Reads Like a Colleague Wrote ItClaude Opus 5.5 opens with the headline, keeps its reasoning readable, and stays coherent across very long sessions.
Getting Claude Opus 5.5 to Work for You
Three quick moves take you from first setup to a model running coding, research, and unattended jobs on its own.
What Claude Opus 5.5 Does Best
The strengths that set Claude Opus 5.5 apart: autonomous coding, huge migrations, injection resistance, dependable research, and lean token usage.
Top-Tier Agentic Coding, Smaller Bill
Scores of 54.6% on FrontierCode and 52.5% on CursorBench place Claude Opus 5.5 near the front, while rivals charge far more per finished task.
Whole-Codebase Migrations and Audits
One tester moved 680,000 lines in under a 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 resists injection attempts at least as well as Opus 5 and drew level with Fable 5.1 on Gray Swan's evaluation.
Research You Can Actually Rely On
Sixteen of eighteen Claude Opus 5.5 reports met our quality bar, and the model reached 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
At Walleye Capital, Claude Opus 5.5 cleared their suite on its lowest setting, and its merger model outperformed Opus 5 within 63 minutes.
Leaner Token Use per Task
Lower per-token pricing plus fewer tokens consumed adds up to a 40% saving, and testers wrapped up in half as many turns.
Claude Opus 5.5: Your Questions Answered
Straight answers on what Claude Opus 5.5 costs, how quickly it responds, how safely it runs unattended, and who can get access.
What does Claude Opus 5.5 charge per million tokens?
Input runs $4 and output $20 per million tokens — a fifth less than Opus 5 — while cached reads cost $0.20; most real workloads land around 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output appears more than 30% sooner than with Opus 5, and Fast mode inside Claude Code can accelerate that up to 2.5x.
Can Claude Opus 5.5 be trusted to run on its own?
It ranks first in our automated behavioral audit, and it is far less likely to take irreversible steps or wander past the boundaries it was given.
How does Claude Opus 5.5 stack up against Opus 5 and Fable 5.1?
On most tasks it keeps pace with Claude Fable 5.1 and clearly outpaces Opus 5, though the gap in daily use is narrower than benchmark numbers imply.
Is Claude Opus 5.5 available for biology or cybersecurity work?
Screened labs may apply to the Life Sciences Verification Program today, and access through the Cyber Verification Program opens up over the coming weeks.
Do subscription limits change with Claude Opus 5.5?
They do — five-hour caps go up 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
Begin with Claude Opus 5.5 at roughly 40% lower cost, backed by higher five-hour caps and a bankable rate-limit reset for subscribers.