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Claude Opus 5.5
Claude Opus 5.5 keeps long coding, research and unattended agent runs on track while cutting the cost of each finished job by close to 40%.
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Claude Opus 5.5 Was Built for Work That Spans Hours
It consumes fewer resources than Opus 5, communicates with more clarity, and carries sprawling agentic projects to completion sooner.
- Nearly 40% Less Spend on Everyday WorkloadsBecause Claude Opus 5.5 uses less compute, standard settings land at $4 per million input tokens, $20 output, and $0.20 for cached reads.
- Output Arrives Over 30% SoonerGeneration outpaces Opus 5 by more than 30%, and switching on Fast mode pushes throughput as high as 2.5x.
- Answers Written Like a Careful ColleagueExpect tighter prose, the conclusion up front, and a partner that holds up through extended working sessions.
Getting Claude Opus 5.5 on Task in Three Moves
A short walkthrough for pointing Claude Opus 5.5 at code, research and jobs that run without supervision.
What Sets Claude Opus 5.5 Apart
Strengths worth noting: autonomous coding, large-scale migrations, prompt injection defenses, research precision, and leaner token use.
Top-Tier Autonomous Coding, Smaller Bill
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while charging far less than competing models for the same job.
Migrations and Audits Across Entire Codebases
One team moved 680,000 lines inside a single day; another repaired 200,000 lines in three hours, a job that took Opus 5 twenty.
Harder to Trick With Injected Prompts
Across coding, tool use and browsing, Claude Opus 5.5 holds its ground against Opus 5, matching Fable 5.1 on Gray Swan's evaluation.
Research and Knowledge Tasks That Hold Up
Sixteen of eighteen Claude Opus 5.5 reports passed our quality threshold, and the model reaches 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched Claude Opus 5.5 clear their suite on the lowest setting, while a merger model outperformed Opus 5 in 63 minutes.
Leaner Token Consumption
Lower per-token pricing combines with fewer tokens consumed per job — a combined drop near 40% — and testers wrap up in half the turns.
Claude Opus 5.5: Questions Answered
Quick answers on what Claude Opus 5.5 costs, how quickly it responds, how safe it is, and who can access it.
What does Claude Opus 5.5 cost to use?
Pricing sits at $4 per million input tokens and $20 per million output, a fifth below Opus 5, with cached reads at $0.20 — everyday workloads land roughly 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output appears over 30% sooner than Opus 5, and Fast mode inside Claude Code can push that as high as 2.5x.
Can I leave Claude Opus 5.5 running unattended?
It ranks first on our automated behavioral audit and rarely takes irreversible actions or wanders 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 improves on Opus 5, and in practice the distance is smaller than raw benchmarks imply.
Is Claude Opus 5.5 available for biology or cybersecurity research?
Approved labs may apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens wider in the weeks ahead.
Will subscription limits change?
Yes — five-hour caps increase across Pro, Max, Team and seat-based Enterprise tiers, and a rate limit reset can be banked and used whenever you like.
Begin Your First Claude Opus 5.5 Session
Kick off a session at close to 40% lower cost, with raised five-hour caps and a bankable rate limit reset for subscribers.