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Claude Opus 5.5
Point Claude Opus 5.5 at a sprawling codebase, a research brief or an overnight run: output lands sooner and the bill shrinks.
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Claude Opus 5.5: Less Compute, Tighter Prose, Quicker Finishes
Fewer tokens go into each task, the prose reads better, and sprawling agentic runs reach the finish line sooner with Claude Opus 5.5.
- Roughly 40% Off a Typical WorkloadBecause it burns less compute, default settings land at $4 input, $20 output and $0.20 for cache reads — a 40% saving.
- Replies That Arrive Over 30% SoonerToken output streams more than 30% quicker than Opus 5, and Fast mode in Claude Code can push that to about 2.5x.
- Answers That Lead With the PointExpect tighter sentences and a clear headline first, which makes Claude Opus 5.5 an easier partner across marathon sessions.
Getting Claude Opus 5.5 Running in Three Steps
A short walkthrough for pointing Claude Opus 5.5 at code, research or an unattended overnight run.
What Claude Opus 5.5 Brings to the Table
Agentic coding, large-scale migrations, injection defenses, research accuracy and a leaner token budget — the areas where Claude Opus 5.5 pulls ahead.
Top-Tier Agentic Coding, Smaller Bills
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while spending a fraction of what rivals need per task.
Migrations Across an Entire Codebase
One tester 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
In coding, tool use and browsing, Claude Opus 5.5 equals or beats Opus 5 and ties Fable 5.1 on Gray Swan's injection benchmark.
Research You Can Actually Cite
Sixteen of eighteen reports from Claude Opus 5.5 cleared our quality bar, and it lands 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital watched Claude Opus 5.5 clear their suite at its lowest setting, and its merger model beat Opus 5 in 63 minutes.
A Leaner Token Budget per Task
Cheaper tokens and fewer of them per job compound into a 40% drop, and testers wrapped up in roughly half the turns.
Claude Opus 5.5: Your Questions Answered
Straight answers on what Claude Opus 5.5 costs, how quickly it responds, whether it is safe to leave running, and how to get access.
What does Claude Opus 5.5 cost to run?
Input runs $4 and output $20 per million tokens, a fifth below Opus 5, while cache reads cost $0.20 — typical workloads end up around 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output arrives more than 30% sooner than with Opus 5, and Fast mode inside Claude Code can reach roughly 2.5x that pace.
Can I leave Claude Opus 5.5 running on its own?
It comes out on top of our automated behavioural audit and is much less inclined to take irreversible steps or wander past the boundaries you set.
How does it stack up against Opus 5 and Fable 5.1?
On most workloads Claude Opus 5.5 performs at Fable 5.1 level and clearly ahead of Opus 5, though the real-world gap is narrower than benchmark scores imply.
Is Claude Opus 5.5 available for biology or cybersecurity work?
Vetted labs can apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens up over the coming weeks.
Do subscription limits change with this release?
They do: five-hour caps go up across Pro, Max, Team and seat-based Enterprise plans, and there is a rate-limit reset you can bank and spend whenever you like.
Put Claude Opus 5.5 to Work Today
Begin at roughly 40% less spend, with roomier five-hour caps and a rate-limit reset subscribers can save for when it matters.