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Claude Opus 5.5
Meet Claude Opus 5.5 — a Claude 5.5 model for heavy coding, research and automation work, priced about 40% below Opus 5 for the same output.
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Claude Opus 5.5 Shines on Complex, Long-Horizon Tasks
Compared with Opus 5, it burns fewer tokens, communicates more plainly, and wraps up sprawling agentic work sooner.
- Pay Roughly 40% Less for the Same WorkloadBecause it consumes less compute, default settings land 40% cheaper — $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Answers Arrive 30% QuickerOutput streams over 30% faster than Opus 5, and turning on Fast mode inside Claude Code can push that toward 2.5x.
- Writing That Reads More NaturallyIt puts the headline first, explains itself plainly, and stays a dependable collaborator across very long sessions.
Getting Started with Claude Opus 5.5
Three short steps take you from first prompt to a finished build, study or hands-off automation run with Claude Opus 5.5.
Inside Claude Opus 5.5: Core Capabilities
Agentic coding, large-scale migrations, prompt-injection defenses, research precision and how few tokens it burns per task — this is where the model pulls ahead.
Agentic Coding at the Frontier, for Less
It posts 54.6% on FrontierCode and 52.5% on CursorBench while spending far less than competing models on each finished task.
Whole-Codebase Migrations and Audits
One engineer moved 680,000 lines in a single day; another repaired 200,000 lines in three hours, a job that took Opus 5 twenty.
Tougher Prompt-Injection Defenses
Across coding, tool use and browsing it equals or outperforms Opus 5, and it draws level with Fable 5.1 on the Gray Swan benchmark.
Precise Research and Knowledge Work
Sixteen of eighteen Claude Opus 5.5 reports met the quality threshold, and the model reaches 1846 Elo on GDPval-AA v2.1.
Financial Analysis and Business Tasks
Walleye Capital cleared its test suite on the model's lowest setting, and one merger model finished ahead of Opus 5 in 63 minutes.
Fewer Tokens Burned per Task
Cheaper tokens plus fewer of them add up to a 40% saving, and testers often reached the finish line in half as many turns.
Claude Opus 5.5: Frequently Asked Questions
Quick answers on what Claude Opus 5.5 costs, how fast it responds, how safe it is to run unattended, and who can get access.
What does Claude Opus 5.5 cost to run?
Expect $4 per million input tokens and $20 per million output tokens — 20% under Opus 5 — plus $0.20 cache reads, so everyday workloads come out about 40% cheaper.
How quickly does the model respond?
Output arrives over 30% faster than Opus 5, and Fast mode inside Claude Code can accelerate that to 2.5x.
Can it be trusted to run on its own?
It scores highest on our automated behavior audit, and rarely takes irreversible actions or wanders past the boundaries you set.
Where does Claude Opus 5.5 sit next to Opus 5 and Fable 5.1?
On most day-to-day work it keeps pace with Fable 5.1 and clearly outpaces Opus 5; in practice the gap is even smaller than the benchmark numbers imply.
Is it available for biology and cybersecurity work?
Verified labs can already apply to the Life Sciences Verification Program, and the Cyber Verification Program opens to more applicants shortly.
Have the subscription usage limits changed?
Yes — five-hour caps go up across Pro, Max, Team and seat-based Enterprise plans, and you also get a rate-limit reset you can bank and spend whenever you like.
Give Claude Opus 5.5 Your Next Big Task
Spend about 40% less on every job you hand to Claude Opus 5.5, and subscribers now get roomier five-hour limits plus a rate-limit reset they can save for later.