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Claude Opus 5.5
Claude Opus 5.5 delivers flagship-grade results across coding, research and analysis — about 40% cheaper per task, with noticeably faster replies.
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Where Claude Opus 5.5 Excels: Long Tasks, Tight Budgets
Built on a leaner compute profile, Claude Opus 5.5 answers in plainer language and wraps up sprawling agent jobs sooner than Opus 5.
- Roughly 40% Cheaper on Everyday WorkloadsDefault settings on Claude Opus 5.5 consume less compute: $4 per million input tokens, $20 for output, and $0.20 for cache reads.
- Replies Arrive Over 30% QuickerGeneration outpaces Opus 5 by more than 30%, and Fast mode inside Claude Code can push throughput to about 2.5x.
- Clearer Writing, Better Long-Session PartnerClaude Opus 5.5 puts the conclusion first, explains its reasoning in plain terms, and holds context across lengthy sessions.
Getting Started With Claude Opus 5.5
Follow three simple steps to run Claude Opus 5.5 on code, research, and jobs that keep working while you are away.
Core Capabilities of Claude Opus 5.5
From agentic coding and large migrations to injection defense and research accuracy, here is where Claude Opus 5.5 pulls ahead.
Top-Tier Agentic Coding, Lower Spend
Claude Opus 5.5 reaches 54.6% on FrontierCode and 52.5% on CursorBench while costing far less per task than its rivals.
Migrations Across Entire Codebases
One tester moved 680,000 lines in a single day; another repaired 200,000 lines in three hours where Opus 5 needed twenty.
Hardened Against Prompt Injection
In coding, tool use, and browsing, Claude Opus 5.5 equals or exceeds Opus 5 on injection tests and ties Fable 5.1 on Gray Swan's benchmark.
Accurate Research and Knowledge Work
Sixteen of eighteen Claude Opus 5.5 reports met our quality bar, and it earns 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched Claude Opus 5.5 clear their suite at its lowest setting, and its merger model beat Opus 5 in 63 minutes.
Leaner Token Usage per Task
Lower cost per token plus fewer tokens per task nets a 40% reduction, with testers wrapping up their work in half the turns.
Claude Opus 5.5: Frequently Asked Questions
Straight answers on Claude Opus 5.5 pricing, response speed, autonomous safety, model comparisons, and program 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; most workloads end up about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
It produces output more than 30% faster than Opus 5, and Fast mode in Claude Code reaches speeds of up to 2.5x.
Can Claude Opus 5.5 run autonomously without risk?
It ranks at the top of our automated behavioral audit and is far 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?
It keeps pace with Claude Fable 5.1 on most tasks and clearly improves on Opus 5, with a narrower real-world gap than benchmarks imply.
Is Claude Opus 5.5 available for biology and cybersecurity work?
Vetted labs can apply to the Life Sciences Verification Program today; Cyber Verification Program access opens wider in the coming weeks.
Will subscription usage limits change?
Yes — five-hour caps increase on Pro, Max, Team, and seat-based Enterprise plans, and a saveable rate limit reset lets you spend it whenever you like.
Put Claude Opus 5.5 to Work Today
Begin with Claude Opus 5.5 at roughly 40% less per task, plus higher five-hour limits and a rate limit reset you can save for later.