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Claude Opus 5.5
Put Claude Opus 5.5 to work on coding, research, and marathon agent runs — near-flagship accuracy for about 40% less per task.
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Claude Opus 5.5: The Workhorse for Multi-Hour Projects
It consumes less compute than Opus 5, communicates with greater clarity, and wraps up sprawling agentic assignments sooner.
- About 40% Less Spend on Everyday TasksBecause Claude Opus 5.5 draws on fewer resources, standard settings land at $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Over 30% Quicker Response TimesToken generation outpaces Opus 5 by more than a third, while Fast mode can push Claude Opus 5.5 throughput as high as 2.5x.
- Cleaner Writing, Better Long SessionsAnswers open with the conclusion, prose reads more naturally, and Claude Opus 5.5 holds context well across extended working sessions.
Getting Started With Claude Opus 5.5
Three quick steps to point Claude Opus 5.5 at coding, research, or hours-long unattended workloads.
What Claude Opus 5.5 Brings to the Table
Standout strengths of Claude Opus 5.5 include agentic coding, large-scale migrations, injection defenses, research precision, and leaner token usage.
Top-Tier Coding Without the Premium
Claude Opus 5.5 reaches 54.6% on FrontierCode and 52.5% on CursorBench while charging far less per task than comparable models.
Whole-Codebase Migrations and Audits
One tester moved 680,000 lines with Claude Opus 5.5 in a single day; another repaired 200,000 lines in three hours, a job Opus 5 needed 20 hours for.
Hardened Against Prompt Injection
Across coding, tool use, and browsing, Claude Opus 5.5 equals or exceeds Opus 5, and on Gray Swan's evaluation it pulled level with Fable 5.1.
Accurate Research and Knowledge Tasks
Sixteen of eighteen Claude Opus 5.5 reports met the quality threshold, and the model posts 1846 Elo on GDPval-AA v2.1.
Finance and Business Workloads
Walleye Capital found Claude Opus 5.5 solved their benchmark suite on the lowest setting, and a merger model finished ahead of Opus 5 in 63 minutes.
Leaner Token Consumption
Lower per-token pricing combines with fewer tokens consumed per job for a 40% net reduction, and testers wrap up Claude Opus 5.5 work in half the turns.
Claude Opus 5.5: Frequently Asked Questions
Answers to the questions people ask most about Claude Opus 5.5 — cost, throughput, safety guardrails, and how to get access.
What does Claude Opus 5.5 cost to run?
Input runs $4 and output $20 per million tokens — 20% under Opus 5 — with cache reads at $0.20. Everyday Claude Opus 5.5 workloads typically land about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Generation runs over 30% faster than Opus 5, and switching on Fast mode inside Claude Code can push Claude Opus 5.5 to roughly 2.5x.
Can Claude Opus 5.5 be trusted to run on its own?
It ranks first on our automated behavioral audit and is significantly less prone to irreversible actions or drifting past the boundaries Claude Opus 5.5 was given.
How does Claude Opus 5.5 stack up against Opus 5 and Fable 5.1?
On most tasks Claude Opus 5.5 performs on par with Fable 5.1 and clearly improves on Opus 5, and in practice the gap is narrower than benchmark numbers imply.
Is Claude Opus 5.5 available for biology or cybersecurity projects?
Verified labs can apply to the Life Sciences Verification Program today, while Cyber Verification Program access for Claude Opus 5.5 opens up over the next few weeks.
Will subscription usage limits change?
They will. Five-hour caps rise across Pro, Max, Team, and seat-based Enterprise plans, and Claude Opus 5.5 users also get a resettable rate limit they can bank and spend anytime.
Put Claude Opus 5.5 to Work Today
Begin with Claude Opus 5.5 at roughly 40% lower cost, plus raised five-hour caps and a bankable rate limit reset for subscribers.