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Claude Opus 5.5
Meet Claude Opus 5.5 — a workhorse AI model that keeps complex coding, research and analysis projects moving without runaway costs.
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Why Claude Opus 5.5 Handles Big Jobs Better
Compared with Opus 5, Claude Opus 5.5 burns fewer tokens, communicates more directly, and closes out complex agent workflows sooner.
- About 40% Cheaper on Everyday TasksLower compute demand keeps default pricing at $4 per million input tokens, $20 output and $0.20 for cache reads — a 40% saving.
- More Than 30% Faster ResponsesToken generation outpaces Opus 5 by over 30%, and switching on Fast mode in Claude Code can push throughput up to 2.5x.
- Answers That Read ClearlyClaude Opus 5.5 states the conclusion first, keeps prose plain, and stays a dependable partner across hours of back-and-forth.
Getting Started with Claude Opus 5.5
Three quick steps to run Claude Opus 5.5 on code, research and unattended long-horizon work.
Claude Opus 5.5 Capabilities at a Glance
Key strengths of Claude Opus 5.5 include agentic coding, large-scale migrations, prompt-injection resistance, research precision and leaner token use.
Top-Tier Coding Agents, Lower Spend
Scores of 54.6% on FrontierCode and 52.5% on CursorBench come at a fraction of what competing models charge per task.
Whole-Codebase Migrations and Audits
One trial moved 680,000 lines in under a day; another repaired 200,000 lines in three hours, a job that took Opus 5 twenty.
Hardened Against Prompt Injection
On Gray Swan's evaluation it ties Fable 5.1, matching or surpassing Opus 5 across coding, tool-use and browsing attack scenarios.
Reliable Research and Knowledge Work
Sixteen of eighteen reports met our quality threshold, and Claude Opus 5.5 also scores 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital cleared its evaluation suite on the lowest setting, and a merger model finished ahead of Opus 5 in 63 minutes.
Leaner Token Consumption
Cheaper tokens plus lower usage per job add up to a 40% reduction, with testers wrapping up in roughly half the turns.
Claude Opus 5.5: Frequently Asked Questions
Answers to the questions people ask most about Claude Opus 5.5 — pricing, response speed, autonomous safety and how to get access.
What does Claude Opus 5.5 cost to run?
Input runs $4 per million tokens and output $20 — 20% under Opus 5 — with cache reads at $0.20, so everyday workloads land about 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Generation is over 30% faster than Opus 5, and Fast mode inside Claude Code can reach roughly 2.5x that rate.
Can I let Claude Opus 5.5 run on its own?
It leads our automated behavioral audit and is far less prone to irreversible actions or drifting past the boundaries it was given.
How does it stack up against Opus 5 and Fable 5.1?
On most tasks it performs at Claude Fable 5.1 level and clearly outpaces Opus 5, with a smaller real-world gap than raw benchmark numbers imply.
Is it available for biology or cybersecurity projects?
Approved labs can apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens up over the next few weeks.
Have subscription limits changed?
They have: five-hour caps rise across Pro, Max, Team and seat-based Enterprise plans, and you now get a rate-limit reset you can bank and spend anytime.
Get Started with Claude Opus 5.5
Spin up Claude Opus 5.5 for about 40% less per task, and subscribers also get higher five-hour caps plus a bankable rate-limit reset.