Anduril Steelfin

Anduril Steelfin is a developmental family of modular, two-stage surface-to-air interceptor missiles intended to serve several air- and missile-defense missions through a common terminal stage and interchangeable boosters.

Overview

Anduril Industries unveiled Steelfin on October 12, 2026, during the Association of the United States Army’s annual meeting. The company describes a configurable interceptor family intended to cover point defense, lower-tier integrated air and missile defense, and upper-tier ballistic missile defense. Its architecture pairs different first-stage boosters with a common second-stage terminal interceptor, according to Anduril’s announcement.

Steelfin’s proposed distinction is the reuse of major components across missiles with different engagement requirements. Anduril says common hardware, open interfaces and commercial components should support lower costs and larger production volumes. The company also intends compatibility with existing ground and naval launchers, reducing the need to develop a separate launching system.

As of November 13, 2026, Steelfin remains a development program. Anduril reports completed ballistic testing with representative air vehicles and plans flight testing in 2027. Engagement range, altitude, unit price and an operational deployment date are not publicly established. The War Zone notes that the company has not published the performance data needed to assess its comparisons with existing interceptors. Steelfin’s stated capabilities and cost advantages therefore remain manufacturer objectives.

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