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Claude Opus 5.5
Try Claude Opus 5.5 online — a frontier model for coding, research, and deep analysis at roughly 40% less cost per task.
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Built for Extended, Multi-Stage Projects
Claude Opus 5.5 uses less compute than Opus 5, communicates with greater clarity, and drives complex agent workflows to completion sooner.
- Roughly 40% Cheaper on Everyday TasksLower compute demand lets default settings run about 40% cheaper — $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Over 30% Faster OutputGeneration runs more than 30% quicker than Opus 5, while Fast mode pushes throughput as high as 2.5x.
- Clearer, More Natural WritingClaude Opus 5.5 puts the key point first, writes with greater clarity, and stays a reliable partner across long sessions.
Getting Started with Claude Opus 5.5
Three simple steps to launch Claude Opus 5.5 on coding, research, and extended autonomous sessions.
What Claude Opus 5.5 Does Best
From agent-driven coding and large-scale migrations to prompt-injection defenses, research precision, and leaner token usage.
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 competing models.
Whole-Codebase Migrations and Audits
One tester moved 680,000 lines in under a day, while another repaired 200,000 lines in three hours — a job that took Opus 5 twenty.
Hardened Against Prompt Injection
Across coding, tool use, and browsing, Claude Opus 5.5 equals or exceeds Opus 5 on injection resistance and matches Fable 5.1 on Gray Swan's benchmark.
Accurate Research and Knowledge Work
16 of 18 Claude Opus 5.5 reports met our quality standard, and the model earns 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched Claude Opus 5.5 clear their suite at the lowest setting, and its merger model outperformed Opus 5 in 63 minutes.
Leaner Token Consumption
Lower cost per token plus fewer tokens per task compounds into a 40% reduction, with testers wrapping up in roughly half the turns.
Claude Opus 5.5: Frequently Asked Questions
Answers to the most common questions about Claude Opus 5.5 — pricing, speed, safety, and how to get access.
What does Claude Opus 5.5 cost?
Expect $4 per million input tokens and $20 per million output tokens — 20% less than Opus 5 — with cache reads at $0.20. Most workloads end up about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output appears over 30% faster than Opus 5, and Fast mode inside Claude Code can push speeds up to 2.5x.
Can Claude Opus 5.5 run safely without supervision?
Yes — it leads our automated behavioral audit and is much less prone to irreversible actions or overstepping its assigned boundaries.
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 outpaces Opus 5; in practice the gap is even narrower than benchmark numbers imply.
Is Claude Opus 5.5 available for biology and cybersecurity work?
Verified labs can apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens up over the next few weeks.
Will subscription usage limits change?
Yes — five-hour caps increase for Pro, Max, Team, and seat-based Enterprise plans, and a savable rate limit reset lets you spend extra capacity whenever you want.
Try Claude Opus 5.5 Right Now
Begin using Claude Opus 5.5 at roughly 40% lower cost, with raised five-hour caps and a saveable rate limit reset for subscribers.