Whether you were at the game or following from elsewhere, we want to know what you learned.
Have your say on Arsenal's performance
What did you make of Brighton's display?
Come back on Thursday for a selection of your replies
It is a big night for Max Dowman, who becomes Arsenal's youngest ever starter at 15 years and 302 days old.
Mikel Arteta has made 10 changes for the match with Brighton, with only Eberechi Eze keeping his starting place.
Brighton also name a much-changed line-up, with Diego Gomez - the competition's leading scorer so far - among those brought into the team.
Ex-Arsenal striker Danny Welbeck is on the bench for the Seagulls.
There are five Carabao Cup games on Wednesday and BBC Sport will bring you every moment.
Kick-off times 19:45 GMT unless stated
Arsenal v Brighton - listen on BBC Radio 5 Sports Extra 2
Liverpool v Crystal Palace - listen on BBC Radio 5 Live
Swansea v Manchester City - listen on BBC Radio 5 Sports Extra 3
Wolves v Chelsea
Newcastle v Tottenham (20:00) - listen on BBC Radio 5 Sports Extra
Follow all of the action and reaction here
You can also listen to today's Radio 5 Live commentaries on most smart speakers. Just say "ask BBC Sounds to play Arsenal v Brighton" or "ask BBC Sounds to play Liverpool v Crystal Palace", for instance.
Find out more about how to listen to football on BBC Sounds
Brighton, Aston Villa and Chelsea are in the race for Strasbourg's 23-year-old Ivory Coast right-back Guela Doue. (Football Transfers), external
Want more transfer stories? Read Wednesday's full gossip column
Joe Sayers
Fan writer
Image source, Getty ImagesIt is very easy to get caught up in the negativity after a loss, especially against a team we have historically done very well against.
But I would like to at least try to highlight a positive from this season so far to hopefully improve the mood.
Yasin Ayari, ever since coming into the side consistently last season, has grown in ability with almost every stride he has taken on the pitch. He is unafraid of challenges, demanding possession and progressing the ball forwards with great control.
Whilst he impressed during a couple of loan moves to the Championship during the 2023-24 season, not many would have expected him to come in and be one of the first names on the teamsheet just a few seasons later.
He has always shown an intelligence on the ball, but what has really stood out for me is his willingness to take responsibility in the middle of the park whilst going face-to-face with some of the best midfielders in the world.
He has got an incredible knack for finding pockets of space to exploit the opposition, and a brilliant intelligence to allow space to open up around him for more time to carve out bigger and better chances.
We are a club built on patience, and Ayari is the perfect example of why we should remain patient as we nurture more talent that will inevitably help us in the long run. It is worth remembering that our Swedish midfield general is still only 22, so there is so much more to come from him.
It is easy for outside eyes to miss Ayari with Carlos Baleba taking all of the headlines, but he brings such different qualities, provides a fantastic balance to our midfield and is often the catalyst that propels the team forwards.
Find more from Joe Sayers at Albion Obsessed, external
Katie Stafford
BBC Sport journalist
Brighton boss Fabian Hurzeler has been speaking to the media before Wedneday's Carabao Cup tie against Arsenal at Emirates Stadium (kick-off 19:45 GMT).
Here are the key lines from his news conference:
James Milner has "suffered a small muscle issue" so is unavailable for the fourth-round tie. Kaoru Mitoma and Brajan Gruda "are getting closer" to a return but Wednesday's game will come too soon for them to feature.
He said they are "getting closer to having a bigger squad" again "which is a good thing" as Joel Veltman is also nearing a return.
On opponents Arsenal: "The table tells the truth. They are doing very well out of possession and from set pieces and they are very disciplined. It will be a big challenge for us."
He said "it is not just Gabriel" that is a threat for the Gunners from set pieces as "they do it very well together and have really good patterns". Hurzeler added: "On the other side, we are quite good in defending and we are quite confident that we are capable of defending against them."
He acknowledged how set pieces are "getting more important in the Premier League" and how they are also "trying to build a set-piece culture but that doesn't come overnight and it needs time".
On balancing squad rotation for the cup: "We have to believe and we really trust the young players because they are here for a reason. It is not about age, it is about quality but for sure you need a good balance in the team."
