There are a couple of PODs ITTL. First, Germany uses the money it would have used to bribe the Ottomans (plus some extra) to bribe Austria-Hungary into giving Italy South Tyrol, so that they will join the Central Powers and contribute men to the western front. The Austrians are finally convinced that this would be wise when the Germans point to Russia's strength and the folly of a two front war, and also promise to support a Habsburg monarch in an independent Ukraine if the war with Russia is won.
Another POD involves the Swedes joining in on the side of the Central Powers to reclaim Finland.
The Italians stay on the defensive and distract the French and BEF enough so that when the race to the channel happens the Germans outpace the French and outflank them at the Battle of Lens. They then break through the front and take Calais. In the ensuing chaos of the French trying to cork the breakthrough, the Italian Army pushes forth and captures Savoy and Nice. The French Army begins to mutiny.
Austro-Hungary, no longer having to worry about Italy, does better against the Russians in the early stages. However, when the Russians execute a moderately successful offensive, the Greeks join the Entente and attack Bulgaria. Austro-Hungary diverts troops from the Russian front to aid its ally. Germany and Sweden still pound Russia heavily.
The Swedes launch an offensive into Finland which further saps the Russians, and once it starts to become clear which way the wind is blowing, the Japanese join the Central Powers and invade the Russian Far East, capturing Vladivostok and fighting all the way to the Amur River.
Rumania joins the CP and takes Moldova and Odessa.
When fewer troops are needed to fight the Russians, A-H and Bulgaria gain the upper hand against the Greeks. Austria-Hungary and Italy invade and partition Albania to safeguard the campaign in Greece. The Ottomans join the Central Powers and declare war on Greece and Russia. They take many of the Aegean Islands, including Crete, and land in Thessaly. In the east, they invade the Caucasus. This is more successful than OTL due to Russia's armies being heavily distracted.
The Italian and A-H Navies do suprisingly well against the French in the Mediterranean, and the Royal Navy has to bail them out somewhat, and when the Japanese declare war, the British send precious ships to the far eastern front to protect Singapore.
This allows the High Seas Fleet to win a crushing victory in the Battle of Jutland, and when the Navy is recalled from the other fronts, they are defeated again in the Battle of Portsmouth. The Germans begin a blockade.
The Irish rebel and quickly take the whole island when German reinforcements are landed.
Meanwhile, Paris falls to the Germans when the BEF is cut off and destroyed, and mutinous army units begin soldier revolutions upon returning home. The Third Republic is dissolved and the soldiers, having elected new generals from among their ranks, and attracted many citizens to their cause, establish the Fourth Republic, executing major French military and civilian leaders.
Russia is gutted by the Germans, Austrians, Ottomans, and Japanese, and surrenders in 1917.
The Treaty of Bremen is signed by representatives from Germany, Austria-Hungary, Italy, Bulgaria, Sweden, Rumania, the Ottoman Empire, Japan, Russia, Greece, the UK, and the SRF. The French colonial empire in Africa is divided between Germany and Italy, except for a small portion in West Africa and Madagascar in which French resistance forces managed to fight off the German expeditionary force which was sent to enforce its gains. A separate peace with these forces was granted which allowed the territories to be returned to France.
Germany gains the rest of Lorraine, Luxembourg, and parts of Belgium in the west. Italy gains Savoy, Nice, and Corsica.
In the east, Sweden annexes Finland and Karelia (The Russian Army collapsed so spectacularly that even the weakest among the victors had an enormous bargaining posture). To appease Finnish nationalists, Sweden decides to become a dual monarchy, and elevate Finland to the same status as Sweden. The Flag is changed to reflect a dual Swedish-Finnish identity.
Germany sets up the puppet kingdoms of Livonia and Courland and Semigallia. They also restore the Polish-Lithuanian Commonwealth to its second partition border. Representatives from Poland and Lithuania are gathered and elect Frederick Augustus III of Saxony (a descendant of Augustus III of Poland) as King of Poland and Grand Duke of Lithuania.
Archduke Maximilian Eugen of Austria is made King of Ukraine, an Austro-Hungarian puppet.
The Ottoman Empire gains many of the Aegean Islands, including Euboea, and Crete is made an Ottoman puppet state. Thessalonica is annexed. In celebration of the victory, the Ottomans change their flag to the banner of Mehmed II after the conquest of Constantinople.
Italy gains parts of Epirus in Greece as well as the island of Corfu. The Italians, drunk on their victory, also invade Abyssinia, which after some setbacks is eventually successful. It is incorporated into Italian East Africa.
Bulgaria gains Macedonia while A-H gets the north of Serbia. Bulgaria also annexes parts of Greece.
Rumania annexes Moldova as well as the area around Odessa.
The Ottomans annex most of the Caucasus as well as a small parcel of northern Iran.
Lastly, Japan gains the Russian Far East up to the Amur, Northern Sakhalin, as well as Kamchatka, Russia's sphere in Manchuria, and it's overlordship of Mongolia.
