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Claude Opus 5.5
Claude Opus 5.5 takes on heavy coding and research jobs at about 40% lower cost than Opus 5, with quicker replies and clearer writing.
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Where Claude Opus 5.5 Wins on Drawn-Out, Multi-Step Tasks
It consumes less compute than Opus 5, communicates with greater clarity, and brings sprawling agentic jobs to completion sooner.
- About 40% Less Spend on Everyday WorkloadsBecause Claude Opus 5.5 draws on less compute, standard settings land at $4 per million input tokens, $20 output and $0.20 for cache reads — roughly 40% below Opus 5.
- Answers Arrive Over 30% SoonerToken output runs more than 30% quicker than Opus 5, and Fast mode can push that advantage to 2.5x.
- Writing That Reads More NaturallyIt puts the headline first, keeps prose easy to follow, and holds up better across long working sessions.
Three Steps to Run Claude Opus 5.5
From effort settings to overnight runs — here is how teams get real results from Claude Opus 5.5.
What Claude Opus 5.5 Can Do
The standout areas for Claude Opus 5.5: agentic coding, large-scale migrations, prompt injection defenses, research accuracy 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 than competing models on each run.
Migrations and Audits Across Whole Codebases
One tester moved 680,000 lines in under a day, while another repaired 200,000 lines in three hours — a job Opus 5 needed 20 hours to finish.
Hardened Against Prompt Injection
Across coding, tool use and browsing, it equals or exceeds Opus 5 on injection resistance, drawing level with Fable 5.1 in Gray Swan's evaluation.
Reliable Research and Knowledge Output
Sixteen of eighteen reports produced with Claude Opus 5.5 met our quality bar, and the model reaches 1846 Elo on GDPval-AA v2.1.
Finance and Business Workflows
Walleye Capital found it cleared their test suite on the lightest setting, and a merger model finished ahead of Opus 5 in 63 minutes.
Leaner Token Consumption
Lower per-token pricing plus fewer tokens consumed adds up to a 40% reduction, with testers wrapping up their work in half the turns.
Claude Opus 5.5: Frequently Asked Questions
Straight answers on what Claude Opus 5.5 costs, how quickly it responds, how safe it is to automate and who can access it.
What does Claude Opus 5.5 cost to run?
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 streams more than 30% faster than Opus 5, and Fast mode inside Claude Code can accelerate that by up to 2.5x.
Can I leave Claude Opus 5.5 running unattended?
It ranks first in our automated behavioral audit and is much less prone to 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?
On most tasks it keeps pace with Claude Fable 5.1 and clearly surpasses Opus 5, and the gap in real use is narrower than benchmark numbers imply.
Is Claude Opus 5.5 available for biology or cybersecurity research?
Screened labs may apply to the Life Sciences Verification Program today, and access through the Cyber Verification Program opens wider over the next few weeks.
Will subscription limits change for Claude Opus 5.5?
They do — five-hour caps increase across Pro, Max, Team and seat-based Enterprise plans, and you also get a rate-limit reset that can be banked and spent whenever you like.
Start Building with Claude Opus 5.5
Run Claude Opus 5.5 for roughly 40% less, and subscribers get higher five-hour limits plus a rate-limit reset they can save and spend anytime.