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Claude Opus 5.5
Claude Opus 5.5 is a lower-cost workhorse for agentic coding, research, and long runs — sharper answers, faster replies, and less spend per task.
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What Makes Claude Opus 5.5 a Reliable Long-Haul Model
Fewer tokens burned, plainer explanations, and fewer stalls: Claude Opus 5.5 keeps wide-ranging agentic projects moving all the way to the end.
- About 40% Less Spend on Everyday TasksBecause Claude Opus 5.5 draws less compute, standard settings land at $4 per million input tokens, $20 per million output, and $0.20 for cache reads.
- Replies Arrive 30% SoonerClaude Opus 5.5 streams answers more than 30% quicker than Opus 5, and Fast mode can push throughput up to 2.5x.
- Writing That Gets to the PointExpect tighter prose that states the conclusion first, so long working sessions with Claude Opus 5.5 stay easy to follow.
Putting Claude Opus 5.5 to Work in Three Steps
A short path from setup to shipped work with Claude Opus 5.5 — covering effort settings, long unattended runs, and final review.
Where Claude Opus 5.5 Pulls Ahead
Agentic coding, large migrations, injection resistance, research accuracy, and leaner token use — the areas where Claude Opus 5.5 shines.
Frontier-Level Agentic Coding, Leaner Bills
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while costing far less per finished task than its rivals.
Whole-Codebase Migrations and Audits
One tester moved 680,000 lines in a single day; another repaired 200,000 lines in three hours — work that took Opus 5 twenty.
Harder to Sway With Prompt Injection
Across coding, tool use, and browsing, Claude Opus 5.5 equals or beats Opus 5, and it ties Fable 5.1 on Gray Swan's benchmark.
Research and Knowledge Work You Can Cite
16 of 18 Claude Opus 5.5 reports met our quality bar, and the model scores 1846 Elo on GDPval-AA v2.1.
Finance and Business Analysis
Walleye Capital found Claude Opus 5.5 cleared their test suite at its lowest setting, and its merger model beat Opus 5 in 63 minutes.
Leaner Token Use per Task
Lower per-token pricing plus fewer tokens consumed nets roughly a 40% saving, and testers wrapped up in half the turns.
Claude Opus 5.5: Frequently Asked Questions
Straight answers on what Claude Opus 5.5 costs, how fast it responds, how safely it runs unattended, and who can access it.
What does Claude Opus 5.5 cost to run?
$4 per million input tokens and $20 per million output, 20% under Opus 5, with cache reads at $0.20; most workloads land about 40% cheaper overall.
How quickly does Claude Opus 5.5 respond?
Output streams more than 30% faster than Opus 5, and Fast mode inside Claude Code can reach up to 2.5x speed.
Can I let Claude Opus 5.5 run unattended?
It ranks at the top of our automated behavioral audit and is much less prone to irreversible actions or wandering outside its assigned scope.
How does Claude Opus 5.5 stack up against Opus 5 and Fable 5.1?
On most work it performs on par with Claude Fable 5.1 and clearly ahead of Opus 5, though the real-world gap is narrower than benchmarks imply.
Is Claude Opus 5.5 available for biology or cybersecurity research?
Vetted labs can apply to the Life Sciences Verification Program today, with Cyber Verification Program access opening over the coming weeks.
Do subscription limits change with Claude Opus 5.5?
Yes — five-hour caps rise across Pro, Max, Team, and seat-based Enterprise plans, and a rate-limit reset can be banked and spent whenever you like.
Put Claude Opus 5.5 on Your Next Big Job
Begin at roughly 40% less spend per task, with roomier five-hour limits and a rate-limit reset subscribers can save for a busy day.