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Claude Opus 5.5
Claude Opus 5.5 handles heavy agentic jobs with clearer writing, quicker replies, and far lower compute costs than Opus 5.
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Where Claude Opus 5.5 Earns Its Place in Your Stack
Compared with Opus 5, Claude Opus 5.5 burns less compute, explains itself more clearly, and wraps up long, tangled agentic workflows sooner.
- About 40% Cheaper on Everyday WorkloadsBecause Claude Opus 5.5 sips less compute, default settings land at $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Over 30% Faster Token OutputTokens stream out more than 30% quicker than Opus 5, and switching on Fast mode inside Claude Code can push that toward 2.5x.
- Writing That Gets Straight to the PointClaude Opus 5.5 opens with the conclusion, stays readable across long threads, and holds up as a collaborator over multi-hour sessions.
Running Claude Opus 5.5: A Three-Step Setup
Pick your effort level, hand over the long job, then review what comes back before anything ships.
What Claude Opus 5.5 Brings to the Table
The strengths that set Claude Opus 5.5 apart: agentic coding, large-scale migrations, injection resistance, research accuracy, and leaner token use.
Top-Tier Agentic Coding, Thinner Bills
With 54.6% on FrontierCode and 52.5% on CursorBench, Claude Opus 5.5 sits among the leaders while charging far less per finished task.
Migrations Across Entire Codebases
One tester moved 680,000 lines in a single day; another repaired 200,000 lines in three hours — a job Opus 5 needed 20 hours to finish.
Harder to Hijack With Prompt Injection
Across coding, tool use, and browsing, injection resistance equals or beats Opus 5, and Claude Opus 5.5 drew level with Fable 5.1 on Gray Swan's test.
Dependable Research and Knowledge Output
Eighteen Claude Opus 5.5 reports were submitted and sixteen cleared our quality bar; the model also reaches 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched Claude Opus 5.5 clear their internal suite on its lowest setting, while a merger model finished ahead of Opus 5 in 63 minutes.
Leaner Token Spend per Task
Cheaper tokens plus fewer of them per job compound into a 40% drop, and testers reached the finish line in roughly half the turns.
Claude Opus 5.5: Questions Answered
Straight answers on what Claude Opus 5.5 costs, how quickly it responds, how safely it runs alone, and who can get access.
What does Claude Opus 5.5 cost to run?
Input runs $4 per million tokens and output $20, which is 20% under Opus 5; cache reads cost $0.20, and everyday workloads typically come in about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Token generation is over 30% quicker than Opus 5, and Fast mode inside Claude Code can climb as high as 2.5x.
Can I leave Claude Opus 5.5 running on its own?
It ranks first on our automated behavioral audit and is markedly less prone to irreversible moves or wandering past the limits 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 and clearly outpaces Opus 5, though the practical difference is smaller than raw benchmark numbers imply.
Is Claude Opus 5.5 available for biology or cybersecurity projects?
Screened laboratories can apply to the Life Sciences Verification Program today, and Cyber Verification Program openings widen over the next few weeks.
Will my subscription usage limits change?
They will: five-hour caps increase across Pro, Max, Team, and seat-based Enterprise tiers, and a rate limit reset can be banked and spent whenever you like.
Get Started With Claude Opus 5.5
Jump into Claude Opus 5.5 at roughly 40% lower cost, with raised five-hour caps and a bankable rate limit reset on paid plans.