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Claude Opus 5.5
Meet Claude Opus 5.5: a frontier agentic model built for long coding and research runs, roughly 40% cheaper per task with sharper output.
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Long-Running Work Is Where Claude Opus 5.5 Shines
Less compute burned, tighter writing, and sprawling agentic jobs finished sooner — that is the upgrade this release brings.
- Typical Workloads Cost 40% LessBecause the model burns less compute, default settings come in 40% cheaper: $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Output Streams a Third FasterResponses arrive over 30% quicker than Opus 5, and Fast mode inside Claude Code can lift throughput as high as 2.5x.
- Clearer, More Natural WritingIt leads with the point, keeps prose readable, and stays a dependable partner across marathon sessions.
Three Steps to Start With Claude Opus 5.5
From effort settings to overnight runs, here is how to point the model at coding, research, and unattended work.
What Claude Opus 5.5 Does Best
Agentic coding, large migrations, prompt injection defenses, research accuracy, and leaner token use — the areas where this model pulls ahead.
Top-Tier Agentic Coding, Lower Bills
It posts 54.6% on FrontierCode and 52.5% on CursorBench while costing far less per finished task than competing models.
Whole-Codebase Migrations and Audits
One tester moved 680,000 lines in under a day; another repaired 200,000 lines in three hours where Opus 5 needed twenty.
Harder to Hijack via Prompt Injection
Across coding, tool use, and browsing it matches or beats Opus 5, tying Fable 5.1 on Gray Swan's injection benchmark.
Accurate Research and Knowledge Work
16 of 18 reports cleared our quality bar, and the model scores 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched it clear their suite at the lowest setting, and its merger model beat Opus 5 in 63 minutes.
Leaner Token Consumption
Cheaper tokens plus fewer of them per task net a 40% drop, with testers wrapping up in half the turns.
Claude Opus 5.5 Questions, Answered
Straight answers on pricing, response speed, safety guardrails, and how to get access.
What does Claude Opus 5.5 cost to use?
Input runs $4 and output $20 per million tokens — 20% below Opus 5 — with cache reads at $0.20, so typical workloads land around 40% cheaper.
How quickly does it respond?
Output arrives more than 30% faster than Opus 5, and Fast mode in Claude Code can push throughput up to 2.5x.
Can I leave it running autonomously?
It sits at the top of our automated behavioral audit and is far less likely to take irreversible actions or wander past the boundaries you set.
How does it compare with Opus 5 and Fable 5.1?
On most everyday work it keeps pace with Claude Fable 5.1 and improves substantially on Opus 5, though the real-world gap is narrower than raw benchmarks suggest.
Can it handle biology and cybersecurity work?
Vetted labs can apply to the Life Sciences Verification Program now, and Cyber Verification Program access opens over the coming weeks.
Are subscription usage limits changing?
Yes — five-hour caps rise across Pro, Max, Team, and seat-based Enterprise plans, plus a rate limit reset you can save and spend whenever you like.
Get Started With Claude Opus 5.5
Put Claude Opus 5.5 on your next project at roughly 40% lower cost, with higher five-hour caps and a bankable rate limit reset for subscribers.