what is the newest fighter jet

The “newest fighter jet” depends on how you define it (first flight, first entering service, or most advanced in frontline use), but as of early 2026 the most notable “newest” fighters are:

• South Korea’s KF‑21 Boramae, moving from flight‑test phase toward initial service and often cited as the newest indigenous 4.5‑generation fighter program reaching operational maturity around 2026.

• Updated variants of existing jets, like the Dassault Rafale F4 standard, which only began entering service in the mid‑2020s and is treated by many analysts as a “new generation” of the Rafale line.

Because my live research tools are currently unavailable this turn, I cannot guarantee an exhaustive, up‑to‑the‑minute list (for example, an aircraft that had its very first flight or a quiet initial service entry in the last few weeks could be missing). Still, based on recent open sources up to early 2026, the KF‑21 and latest Rafale F4 standard are among the most recent advanced fighter designs transitioning from development into real service.