Anthropic Claude Opus 5.5 released; cheaper and smarter AI model

Anthropic has officially unveiled Claude Opus 5.5, marking a major milestone as the company's first major flagship model release since leadership publicly emphasized the importance of pacing frontier AI development for safety.

This new iteration delivers a powerful blend of advanced reasoning, enterprise-grade cost efficiency, and rigorous third-party safety evaluations designed to meet the demands of modern developers and corporate adopters.

A primary focus of this release is slashing operational overhead. Anthropic has dramatically reduced the model's running costs, making it roughly 40 percent more affordable than its predecessor.

API pricing is set at $4 per million input tokens and $20 per million output tokens, while cache reads vital for heavy coding workflows have plummeted by 60 percent to just $0.20 per million tokens.

Furthermore, text generation speeds have increased by over 30 percent, allowing for faster execution during complex, multi-step tasks.

Engineered specifically for long-horizon agentic work, Claude Opus 5.5 excels at large-scale code reviews, massive software migrations, and deep scientific analysis.

Early enterprise testers report remarkable productivity gains, noting that the model successfully handles complex data pipelines and multi-file codebases with unprecedented coherence.

This launch coincides with Anthropic's plans for an upcoming fall IPO that is expected to be the biggest in history.

The investor community has been expecting that an upgrade would lead to the publication of the much-awaited prospectus of the firm, to see whether Anthropic can continue growing amidst stiff competition and rising consumer price sensitivity.

Because of these advanced capabilities, Anthropic subjected Opus 5.5 to extensive third-party safety audits, ensuring strong resilience against prompt injection and sophisticated containment bypasses.

The model is available on Amazon Web Services, Google Cloud, and Microsoft Azure. As per Anthropic, Opus 5.5 outscored OpenAI’s GPT 5.6 Sol on a software development benchmark while costing roughly one-third as much to run.

The company also reported the model was about 85% less likely than Opus 5 or Mythos 5.1 to attempt bypassing containment boundaries in safety evaluations. External testing was conducted by independent groups Frontier Designer and METR.