Introduction of Claude Opus 5.5 Model with Enhanced Performance and Cost Efficiency

Sep 22, 2026

AI Summary

Claude Opus 5.5 has been launched as the first model in the Claude 5.5 family, offering improved performance at a reduced operational cost. It outperforms its predecessor, Opus 5, in various tasks while also incorporating advanced safety features.

Claude Opus 5.5 is the first model in the new Claude 5.5 family, designed to perform at the level of Claude Fable 5.1 but at 40% lower operational costs compared to Opus 5.
The model has undergone testing by external evaluators and achieved the highest scores in alignment tests, demonstrating improved safety and reliability.
Performance enhancements include significant improvements in complex tasks, such as a 680,000-line code migration completed in under a day, and better efficiency in software optimization.
Opus 5.5 is less likely to take unintended actions and is more resistant to prompt injection compared to previous models, with safeguards similar to those on Claude Fable 5.1.
The model is priced lower than Opus 5, with input and output tokens costing 20% less, and cache reads costing 60% less, resulting in a 40% reduction in overall costs.
Opus 5.5 communicates more clearly and naturally, improving usability and collaboration during long sessions.
Future models, Claude Sonnet 5.5 and Claude Haiku 5.5, are expected to follow with similar improvements.
Early testers reported that Opus 5.5 is particularly effective for long tasks, such as codebase migrations and audits, completing them in significantly less time and at lower costs compared to Opus 5 and other models.
The model has demonstrated superior performance in various benchmarks, including coding tasks, while maintaining cost efficiency.

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Introduction of Claude Opus 5.5 Model with Enhanced Performance and Cost Efficiency

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