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Claude Opus 5.5
Claude Opus 5.5 delivers Fable 5.1-level results on most work at 40% less cost than Opus 5, with faster, clearer output.
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Why Claude Opus 5.5 Excels at Long, Multi-Step Work
With Claude Opus 5.5, sprawling agentic jobs finish faster on less compute, and every response reads clearer than Opus 5.
- 40% Cheaper on Everyday WorkloadsBecause Claude Opus 5.5 consumes less compute, standard settings run 40% cheaper — $4 input, $20 output, and $0.20 for cache reads.
- Output That Streams 30% FasterResponses from Claude Opus 5.5 arrive over 30% quicker than Opus 5, and Fast mode in Claude Code pushes that up to 2.5x.
- Clearer, More Natural CommunicationClaude Opus 5.5 leads with the point that matters, writes more plainly, and stays a reliable partner across long sessions.
How to Work With Claude Opus 5.5
Three quick steps to run Claude Opus 5.5 on coding, research, and long unattended jobs.
What Claude Opus 5.5 Does Best
See where Claude Opus 5.5 pulls ahead: agentic coding, large migrations, injection defenses, research accuracy, and leaner token use.
Frontier Agentic Coding, Lower Cost
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while costing a fraction of what rivals charge per task.
Codebase-Wide Migration and Audits
One tester moved 680,000 lines in under a day; another patched 200,000 lines in three hours where Opus 5 needed 20.
Hardened Prompt Injection Defenses
In coding, tool use, and browsing, Claude Opus 5.5 matches or beats Opus 5, tying Fable 5.1 on Gray Swan's injection test.
Accurate Research and Knowledge Work
16 of 18 Claude Opus 5.5 reports passed 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.
Fewer Tokens for Every Task
Claude Opus 5.5 charges less per token and burns fewer of them per task — a 40% net drop, with testers finishing in half the turns.
Claude Opus 5.5: Frequently Asked Questions
Quick answers on Claude Opus 5.5 pricing, speed, autonomous safety, model comparisons, and how to get access.
What does Claude Opus 5.5 cost?
Claude Opus 5.5 bills $4 per million input tokens and $20 per million output tokens, 20% under Opus 5, with cache reads at $0.20 — typical workloads land 40% cheaper.
How fast does Claude Opus 5.5 generate output?
Claude Opus 5.5 produces output over 30% faster than Opus 5, while Fast mode in Claude Code can reach up to 2.5x speed.
Can Claude Opus 5.5 run autonomously without risk?
Claude Opus 5.5 ranks first in our automated behavioral audit and is much less likely to take irreversible actions or stray past its boundaries.
How does Claude Opus 5.5 compare to Opus 5 and Fable 5.1?
Claude Opus 5.5 keeps pace with Claude Fable 5.1 on most work and clearly outperforms Opus 5, with a real-world gap narrower than benchmarks imply.
Can Claude Opus 5.5 handle biology and cybersecurity work?
Vetted labs can apply to the Life Sciences Verification Program today, while Cyber Verification Program access widens over the coming weeks.
Will subscription usage limits change?
Yes — five-hour limits increase across Pro, Max, Team, and seat-based Enterprise plans, and a saveable rate limit reset lets you spend it whenever you like.
Put Claude Opus 5.5 to Work Today
Begin using Claude Opus 5.5 at 40% lower cost, with higher five-hour limits and a saveable rate limit reset for subscribers.