The H-6 is a licence-built development of the Tupolev Tu-16, not an independent Chinese design — a distinction worth keeping clear. The 1957 agreement gave China Soviet-made aircraft, component kits and manufacturing data; early airframes were assembled at Harbin before production moved to Xian in the early 1960s. When Soviet technical help was withdrawn after the Sino-Soviet split, Chinese engineers had to reverse-engineer and re-document parts of the aircraft to complete a wholly domestic example, which is why the “first flight” is quoted two ways: a Soviet-parts assembly in 1959 and a fully Chinese-built aircraft in 1968.

Exact production totals and dates vary between sources and should be read as estimates. What is not in dispute is longevity: where the Soviet Union retired its Tu-16s decades ago, China kept the basic airframe in production and service, upgrading it repeatedly rather than replacing it. The modern H-6K and H-6N share that lineage but are, in avionics, engines and weapons, very different aircraft from the 1950s bomber they descend from.

The H-6N, publicly revealed around 2019, is the most specialised variant. It adds an aerial-refuelling probe — unusual for the type — which extends its range and is widely read as supporting a longer-reach strike or deterrent mission. Its fuselage was reworked with a centreline recess reported to carry a large air-launched ballistic missile, and analysts have linked it to what may be a hypersonic or manoeuvring weapon. Much about the missile remains officially unconfirmed, so these descriptions rest on satellite imagery, photographs and analyst assessment rather than disclosed data.

If those assessments are correct, the H-6N would give China an air-launched leg to complement its land- and sea-based long-range forces — part of what US and other assessments describe as a developing air-based component of China’s deterrent. The word “developing” matters: the capability is real enough to track but still maturing, and precise numbers, ranges and readiness are not publicly established.

The point of the modernised H-6 is its weapons load. Land-attack variants carry cruise missiles of the KD-20/CJ-10 family — commonly cited at six per aircraft, sometimes a seventh on a centreline station — giving a subsonic bomber a way to hit targets many hundreds of kilometres away. Naval variants such as the H-6G and H-6J, flown by the PLA Navy, specialise in anti-ship strike with weapons including the supersonic YJ-12. The common thread is standoff: the aircraft is a launch platform, valued for how far its missiles reach rather than for speed, stealth or the ability to fight its way to a target.

The H-6 is a Chinese state military product, never sold on an open market, so there is no credible public flyaway unit price or cost-per-flight-hour figure for the type — and certainly none for the modern H-6K or H-6N. Any specific dollar number attached to the aircraft should be treated as speculation rather than a sourced figure.

What can be said with more confidence is the economic logic behind the programme: repeatedly upgrading a long-established airframe is generally far cheaper than developing an all-new bomber, which is part of why China kept improving the H-6 while a clean-sheet stealth successor, the H-20, was reportedly under development.