KAAN vs Su-57 Felon: Full Technical Comparison of Two Non-Western Fifth-Generation Fighters (2026)

KAAN was conceived from a clean sheet as a twin-engine, internal-weapons-bay, low-RCS fifth-generation platform. TAI emphasizes faceted alignment, S-duct intakes and a clean planform to reduce frontal signature. Because the aircraft is still a prototype, its real-world low-observable performance is unproven and radar-absorbent coatings have yet to mature, but the underlying airframe geometry follows contemporary stealth design discipline.

The Su-57 is in service and combat-employed, yet its stealth credentials are the most debated of any fifth-generation type. Visible riveting, exposed engine faces in early configurations and the diverter geometry have led many Western analysts to assess its all-aspect RCS as inferior to the F-22 and F-35. Russia frames the Felon as a balance of low observability with extreme agility rather than a pure stealth airframe. On signature discipline alone, KAAN’s newer design intent is competitive, but neither aircraft can yet claim a validated edge against Western benchmarks.

KAAN’s central dependency is propulsion. The flying prototypes and the first 20-40 aircraft use the U.S. General Electric F110, which carries export-licence and supply risk for a NATO-but-frictioned customer. Turkey is developing the indigenous TF35000 turbofan (~35,000 lbf), with initial testing in 2026 and airframe integration planned for 2032. Until then KAAN’s performance envelope is bounded by an interim foreign engine.

The Su-57 enjoys mature, domestically produced propulsion and raw kinematic performance: two AL-41F1 engines today, with the second-stage AL-51F1 (izdeliye 30) delivering roughly 16,000 kgf and full thrust-vectoring for supermaneuverability. The Felon’s Mach 2 top speed, supercruise ambitions and post-stall agility are genuine strengths. KAAN’s twin-engine layout promises strong performance once the TF35000 arrives, but in 2026 the proven flight envelope clearly belongs to the Su-57.

KAAN is built around ASELSAN’s indigenous AESA radar (MURAD family), electro-optical systems, a national mission computer and a modern sensor-fusion architecture, with a roadmap toward manned-unmanned teaming alongside Baykar’s KIZILELMA. For NATO and export customers, a Western-compatible, ITAR-light avionics suite that is fully sovereign to the buyer is a meaningful selling point, even though it is not yet operationally proven.

The Su-57 fields the N036 Byelka AESA with supplementary side-looking arrays and L-band wing-edge antennas intended for improved situational awareness and counter-stealth detection. The sensor concept is ambitious, but integration maturity, data-fusion quality and the reliability of Russia’s electronics supply chain under sanctions remain open questions. KAAN’s avionics are newer and Western-aligned; the Su-57’s are fielded but of uncertain real-world fusion performance.

KAAN is designed to carry an indigenous Turkish weapons package internally: the beyond-visual-range GOKDOGAN and within-visual-range BOZDOGAN air-to-air missiles, the developmental long-range GOKHAN, and the SOM-J stand-off cruise missile, all produced by ROKETSAN and TUBITAK SAGE. This sovereign munitions ecosystem lets Turkey offer the platform for export without third-party release restrictions, a structural advantage over both U.S. and Russian options, though the inventory has no combat history yet.

The Su-57 has been employed operationally by Russia, including launching stand-off weapons in the war in Ukraine, giving it limited but real combat exposure that KAAN entirely lacks. Its arsenal includes the R-77M and R-74M2 air-to-air missiles and Kh-59MK2/Kh-38 stand-off weapons. For a buyer, however, Russian munitions now carry severe sanctions, supply and interoperability penalties. KAAN trades combat-proven status for clean, NATO-compatible, export-unrestricted weapons integration.

Production maturity favours the Su-57 today: it is in low-rate serial production with the Russian Aerospace Forces and, after years of difficulty, has secured its first confirmed export customer, with Su-57E airframes reported in Algeria in early 2026 and plans for a full squadron. KAAN does not reach serial production until a 2029 target, and its first export interest comes from Indonesia, which signalled intent for 48 aircraft.

From a procurement and alliance standpoint, KAAN’s strategic value is its Western alignment and freedom from sanctions exposure. Russia’s defence-industrial base is constrained by international sanctions, component shortages and a Felon production rate that has remained low for a decade, which caps the Su-57’s realistic export reach to a narrow set of buyers. KAAN, by contrast, is positioned as a sovereign, embargo-resilient fifth-generation option for nations seeking an alternative to both the F-35 and the Felon. The Su-57 wins on today’s fielded numbers; KAAN’s edge is its future export accessibility and clean technology base.

The Su-57 is the more mature aircraft today: it is operational with the Russian Aerospace Forces, has limited combat exposure in Ukraine and fields domestic engines, but its stealth quality is widely questioned and sanctions cripple its export reach. KAAN is a newly flying NATO-aligned prototype whose advantages, indigenous sensors, sovereign weapons and export accessibility, will only be realised once it reaches serial production around 2029.

Many Western analysts assess the Su-57’s all-aspect radar cross-section as inferior to the F-22 and F-35 because of visible airframe details and early-configuration engine exposure. Russia presents it as a blend of reduced observability and extreme agility rather than a pure low-observable design, which makes its stealth credentials the most contested among fifth-generation fighters.

KAAN made its first flight on 21 February 2024, with a full prototype flight expected in mid-2026 and serial production targeted for 2029. The first 20-40 aircraft will use the General Electric F110 engine, while integration of Turkey’s indigenous TF35000 engine is planned for 2032.

KAAN is NATO-aligned and built around a sovereign weapons and sensor package from ROKETSAN, TUBITAK SAGE and ASELSAN, so it can be offered for export without the third-party release restrictions of U.S. systems or the sanctions exposure of Russian ones. For buyers wary of both Washington and Moscow, it offers an embargo-resilient fifth-generation alternative.

Yes. After a decade of limited production, the Su-57E export variant secured its first confirmed customer in Algeria, with airframes reported in flight there in early 2026 and plans to build up to a full squadron. India had earlier participated in a derivative programme but withdrew in 2018.