Short answer — as of today (26 Oct 2025) the highest‑efficiency residential/commercial silicon panels you can buy in Australia are premium N‑type / HJT / IBC and advanced TOPCon modules from makers such as SunPower (Maxeon), Aiko, Winaico, REC, Jinko, LONGi and Trina. Leading models and their typical peak efficiencies:

• SunPower Maxeon 7 (Maxeon family) — ~23–24% (industry‑leading premium IBC cells; long warranties). (powermarket.com.au)
• Aiko Neostar 2P — ~23.6% (high‑efficiency commercial/residential module available in Australia). (SolarQuotes.com.au)
• Winaico WST‑series (NGX/D3) — ~23.0% (high‑efficiency PERC / advanced cell designs). (SolarQuotes.com.au)
• REC Alpha Pure / Alpha Pure‑R — ~22.3–22.6% (HJT / low degradation, strong heat/coastal performance). (powermarket.com.au)
• Jinko Tiger Neo (N‑type / TOPCon variants) — ~22–22.5% (very strong value/performance). (powermarket.com.au)
• LONGi Hi‑MO X / Hi‑MO X10 (new Hi‑MO X family) — ~22–22.5% (LONGi’s high‑efficiency modules released into the Australian market). (LONGi.com)
• Trina Vertex S+ / HJT records — ~22–23% (Trina also reported HJT record research; Vertex series is a high‑efficiency commercial/residential option). (solarset.com.au)

Notes you should know

• “Efficiency” here is cell/module conversion efficiency (percent of sunlight turned into electricity). Higher efficiency means more power from a limited roof area but usually comes at higher cost. (SolarQuotes.com.au)
• Real availability and model names/specified efficiency can change quickly (manufacturers release new variants frequently). The brands above are widely sold in Australia in 2024–2025 and represent the top‑end efficiency options; exact model specs, wattages and warranties should be checked with local distributors/retailers before purchase. (SolarQuotes.com.au)
• Tradeoffs: very high‑efficiency panels (SunPower/Maxeon, some HJT/IBC designs) cost more but offer higher energy yield per m² and often longer performance warranties (some up to 25–40 years). Mid‑range high‑efficiency TOPCon/N‑type panels (Jinko, LONGi, Trina, REC) give a better price/performance balance. (powermarket.com.au)

If you want, I can:

• look up current Australian distributors/prices and exact model part numbers near your postcode (I’ll check live availability and local installers), or
• compare top 3 panels by cost per watt and expected annual energy yield for a typical Australian roof size.

Which would you prefer?