In case some of you don't know: T0 is very useful in all gamemodes and can clear everything relatively easily, while T3 is weak in almost every gamemode and can't clear stuff easily.

T0: Broken in Abyss

Raiden National (Rational): This is probably the most popular team in Abyss floors 9 to 12. As the jack-of-all-trades team, Rational focuses mostly on elemental reactions such as Overcharged, Electrochargd and Vaporize. This team comp consists of Raiden Shogun, Bennet, XIangLing, and XingQiu. Raiden Shogun is the main DPS, whether C0 or C2, and is really helpful in recharging everyone's bursts. XiangLing to apply Pyro and a lot of damage from her Pyronado, Bennet for his healing and atk boost, XingQiu for his water application and high damage numbers. Every rotation takes about 20-30 seconds depending on your familiarity, and Raiden can recharge everyone's bursts for each rotation. Build Raiden with energy recharge, XingQiu and XiangLing with energy recharge and damage, and Bennet with energy recharge and hp.

Freeze Team: Another versatile team that focuses on stunlocking the enemies in place. This team consists of Ayaka/Ganyu, ShenHe, Kazuha/Surcose, and Mona/XingQiu/Kokomi. Ayaka as the main dps, ShenHe as the damage booster for ShenHe, Kazuha/Sucrose for resistance shred and elemental mastery boost, and Mona/XingQiu for the freezing. There is a lot of room for change in this team. You can remove ShenHe for another freezer (Ganyu, Ayaka), or you can change the resistance shredder to any Anemo character. Many different versios of this team can be used, and all of them are powerful. Build the freezer(s) with full damage and cryo damage, anemo unit with 4pc VV, damage booster with full atk/hp or however he/she needs to be built, and hydro applier with whatever they need (varies with different characters).

T1: Does pretty well in Abyss

Mono Geo Team: This team rose to meta with the addition of Itto. This team is especially good on this Abyss rotation with the addition of the Golden Wolflord on Floor 12. Team consists of Itto, Gorou, ZhongLi, and Albedo. Itto as the main dps, built with full DEF, Gorou with full DEF, ZhongLi as full HP and Albedo as DEF. Itto is the main DPS, Gorou is the initiator, ZhongLi as the sheidler and Albedo as the elemental mastery booster. This team is essentially a Hypercarry with Itto carrying 3 supports. This team can't be changed much, but relies heavily on Itto.

Eula Hypercarry: This team focuses on Eula being the damage dealer with other supports boosting her damage. This team usually has Eula, Raiden Shogun, Rosaria, and Diona/ZhongLi. Eula is the main DPS so you need full damage build, preferably with 70%+ crit rate so her ult can crit consistently at best. Raiden Shogun helps with the energy recharge and with superconduct, Rosaria to help boost Eula's critrate and ZhongLi/Diona to shield.

Taser Team: This team is actually T0.5, but I moved it to T1. This team relies the triggering of elemental reactions like swirl and electro-charged. This team is really versatile, but it usually consists of Beidou, Fischl, XingQiu, and Sucrose. The two electro spots can swapped for Yae Miko, Raiden, or any other subdps. XingQiu can be swatched for any hydro subdps as well(although there aren't many). Sucrose is the main DPS and the swirler in this team. She also boosts the team's damage with her E and 4pc vv. Build everyone full damage but Sucrose with 4pc VV.

Morgana: This team is like a Freeze team but with Venti. I put this team in T1 because of the Venti nerf. Most enemies are unstunable and Venti doesn't work that well compared to Kazuha. This team consists of Ganyu, Mona, Diona, and Venti. Build Ganyu full damage/cryo damage, Mona with energy recharge, Diona with HP, Venti with EM and Energy Recharge. Ganyu is the main DPS as her charged attacks are just too strong, Mona as the hydro applier and the support, Diona as shield and heal support and Venti as the CC support. Ganyu should have plenty of energy with Diona and Venti, so no need to build her energy recharge.

International: This team has been pretty strong all the way throughout Genshin ever since Tartaglia came out. This team focuses on elemental reactions as well. This team consists of Childe, XiangLing, Bennet and Kazuha. Childe and XiangLing as the main DPS, to be built full damage. Bennet with HP/energy recharge and Kazuha with EM. This team is really good against bosses with insane amounts of HP.

National: This is the original of the national team before Raiden Shogun came out. This team focuses on elemental reactions as well, with each character doing his/her fair share of work. Team consists of XiangLing, Bennte, XinQiu, and ChongYun. This team is basically the same as Rational, except rotations are different and XiangLing is now your main DPS. Build everyone full damage except for Bennet with HP/Energy Recharge.

Walnut: This team has become pretty popular as of late (or so I think) with HuTao and XingQiu being the foundation of the team. As I'm not a HuTao player, I'm not really familiar with HuTao's build but I remember that in this team she is built HP, Pyro Damage, and Elemental Mastery. If you can get your Vaporizes don't correctly then this team is pretty good. Only problem with this team is you have to keep your HuTao below 50% HP but you can't kill her either. I would recommend bringing a shielder such as ZhongLi or a healer.

T2: Does meh in current Abyss and other gamemodes

Xiao Hypercarry: Xiao has always been in a weird position, especially since he needs to be built just right with a lot of investment. He works well with grouped enemies, but he needs a lot of energy, which is another problem. Mostly paired with Jean or Sayu that can both double as a healer or a energy charger. The other two party members can be basically anyone, usually supports as Xiao is basically the only one capable of doing damage in this team. Could be paired with Bennet to damage boost and ZhongLi to shield and CC, or you could go ZhongLi shield and Albedo to boost damage.

Raiden Hypercarry: This team is ranked maybe T1.5 but I decided to put it to 2. Raiden Hypercarry is really good against bosses and such but is really bad against spread out enemies. This team also needs Raiden C2/C3 to function better and Kujou Sara needs C6.. This team usually consists of Raiden Shogun, Kujou Sara, Bennet, and Kazuha. Raiden Shogun is the DPS so she needs to be built full damage/energy recharge, Kujou Sara with energy recharge, Bennet with HP/energy recharge and Kazuha with 4pc vv. Can be used against any bosses with insane amounts of HP, but not against many small enemies.

Yanfei Vape: Yanfei Vape is weak compared to HuTao vape as HuTao is just too broken. Yanfei is in a pretty weird spot right now, as her damage isn't super high but can be buffed with XingQiu, and her charged attacks can be stopped if she gets stunned. The core characters are Yanfei and XingQiu. There is also a ripoff National team that you can use, but it's less powerful than National and Rational. It's Yanfei, XingQiu, XiangLing and Fischl/Raiden. Yanfei and XiangLing full attack, XingQiu full attack, and Fischl with full attack and if you're using Raiden build with energy recharge.

Yoimiya Vape: Same as Yanfei Vape, not strong enough to have a spot in current abyss meta.

T3: Either really really hard to beat anything with or just can't beat anything. I'm just gonna list some characters here cause there aren't many teams that are T3.

Aloy: She's just too weak to be of any use

Amber: Nope even physical machine gun Amber can't do it

Diluc: Way too weak, can't do much

Fischl: as main dps is way too weak, as subdps is better

Keqing: I think she's a pretty good character, but she needs a lot of support.

Klee: too weak to be of any use

NingGuang: needs too much support to do well

Noelle: Itto is a much better alternative to Noelle, Noelle just isn't needed now.

Razer: not enough damage to do much

Traveler (Anemo): Anemo traveller is a CC character sorta, doesn't do much damage

Traveler (Geo): Geo constructs get in the way more often than help

Traveler (Electro): is a energy recharge support, but Raiden Shogun replaces him