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Claude Opus 5.5
Explore what Claude Opus 5.5 can do: top-tier agentic coding and analysis at about 40% less cost than Opus 5, with noticeably quicker responses.
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Claude Opus 5.5: Endurance and Clarity for Agentic Work
With lighter compute demands, tighter writing, and quicker completion of sprawling agentic jobs, Claude Opus 5.5 keeps momentum going.
- Typical Workloads Cost 40% LessBecause Claude Opus 5.5 consumes less compute, standard settings land 40% cheaper — $4 per million input tokens, $20 output, $0.20 for cache reads.
- Over 30% Faster Output GenerationToken generation outpaces Opus 5 by more than 30%, and enabling Fast mode inside Claude Code can push that as high as 2.5x.
- Clearer, More Natural WritingAnswers open with the conclusion instead of burying it, and the tone holds up well across marathon working sessions.
How to Put Claude Opus 5.5 to Work
Follow three simple steps to run coding, research, and unattended workloads on Claude Opus 5.5.
Key Capabilities of Claude Opus 5.5
The strengths that matter most in Claude Opus 5.5 — large-scale migrations, injection resistance, research precision, and leaner token budgets.
Top-Tier Agentic Coding, Lower Spend
Benchmarks put it at 54.6% on FrontierCode and 52.5% on CursorBench, while the bill per job stays well under competing models.
Migrations and Audits Across Entire Codebases
One team moved 680,000 lines in a single day; another repaired 200,000 lines in three hours — a job that took Opus 5 twenty.
Harder to Break with Prompt Injection
Across coding, tool use, and browsing scenarios it equals or surpasses Opus 5, matching Fable 5.1 on the Gray Swan evaluation.
Reliable Research and Knowledge Output
Sixteen of eighteen reports met the quality threshold, and the model posts 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital cleared its test suite using the model's lowest setting, and a merger model finished ahead of Opus 5 in 63 minutes.
Leaner Token Use on Every Job
Cheaper tokens plus fewer of them per job add up to a 40% reduction, and early testers wrapped up in roughly half the turns.
Claude Opus 5.5: Frequently Asked Questions
Straight answers on Claude Opus 5.5 pricing, response speed, autonomous safety, and how to get access.
What does Claude Opus 5.5 cost to run?
Expect $4 per million input tokens and $20 per million output tokens — 20% under Opus 5 — plus $0.20 cache reads; most workloads come in 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output streams more than 30% faster than Opus 5, and Fast mode inside Claude Code can reach 2.5x.
Can Claude Opus 5.5 be trusted to run on its own?
It ranks at the top of our automated behavioral audit and is much less prone to irreversible actions or drifting 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 performs on par with Claude Fable 5.1 and clearly ahead of Opus 5, with a real-world gap narrower than raw benchmarks imply.
Can Claude Opus 5.5 handle biology and cybersecurity projects?
Verified labs can apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens wider in the coming weeks.
Will subscription usage limits change?
Yes — five-hour caps increase across Pro, Max, Team, and seat-based Enterprise plans, and there's a rate limit reset you can bank and use whenever you like.
Start Building with Claude Opus 5.5
Begin with Claude Opus 5.5 at roughly 40% less cost per job, plus raised five-hour caps and a bankable rate limit reset for subscribers.