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Claude Opus 5.5
Claude Opus 5.5 anchors the Claude 5.5 lineup, matching Fable 5.1 on most tasks at roughly 40% less cost than Opus 5, with faster, cleaner output.
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Why Teams Trust Claude Opus 5.5 With Their Hardest Jobs
Running on fewer compute cycles than Opus 5, Claude Opus 5.5 writes with greater clarity and pushes sprawling agent workflows to completion sooner.
- Typical Workloads Cost About 40% LessBecause Claude Opus 5.5 consumes fewer compute resources, standard settings land at $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Roughly 30% Quicker Response GenerationCompared with Opus 5, Claude Opus 5.5 returns answers over 30% faster, and Fast mode inside Claude Code can push throughput as high as 2.5x.
- Communication That Reads More NaturallyAnswers from Claude Opus 5.5 open with the conclusion, stay easy to follow, and hold up better across extended working sessions.
Getting Started With Claude Opus 5.5
Follow three simple steps to run Claude Opus 5.5 on coding, research, and extended unattended tasks.
Core Capabilities of Claude Opus 5.5
The areas where Claude Opus 5.5 pulls ahead: agentic coding, large-scale migrations, prompt-injection defenses, research precision, and leaner token use.
Top-Tier Agentic Coding, Lower Spend
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while spending far less per completed task than competing models.
Whole-Codebase Migrations and Audits
In testing, one team migrated 680,000 lines in under a day, while another resolved 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 on injection resistance and matches Fable 5.1 on Gray Swan's benchmark.
Accurate Research and Knowledge Work
Sixteen of eighteen Claude Opus 5.5 reports met our quality threshold, and the model scores 1846 Elo on GDPval-AA v2.1.
Built for Financial and Business Analysis
Walleye Capital found Claude Opus 5.5 solved their suite at its lowest setting, and its merger model outperformed Opus 5 in 63 minutes.
Leaner Token Consumption per Task
A lower per-token price plus fewer tokens consumed per job nets a 40% reduction, with testers wrapping up in half the turns.
Claude Opus 5.5: Frequently Asked Questions
Answers to the most common questions about Claude Opus 5.5, covering pricing, response speed, safety, and how to get access.
What does Claude Opus 5.5 cost to use?
Pricing sits at $4 per million input tokens and $20 per million output tokens — 20% under Opus 5 — with cache reads billed at $0.20; most workloads end up around 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output arrives more than 30% faster than with Opus 5, and Fast mode inside Claude Code can reach speeds up to 2.5x.
Can Claude Opus 5.5 be trusted to run on its own?
It leads our automated behavioral audit and is significantly less prone to taking irreversible actions or drifting beyond 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 the majority of tasks and represents a clear jump over Opus 5, with a real-world gap narrower than benchmark scores imply.
Is Claude Opus 5.5 available for biology and cybersecurity research?
Approved labs can apply to the Life Sciences Verification Program right away, while Cyber Verification Program access opens up over the coming weeks.
Will subscription usage limits change?
They will: five-hour caps increase across Pro, Max, Team, and seat-based Enterprise plans, and a rate limit reset can be saved and spent whenever you like.
Put Claude Opus 5.5 to Work Today
Get going with Claude Opus 5.5 at roughly 40% less spend, plus higher five-hour caps and a rate limit reset subscribers can bank for later.