Current Powers (Anti-Venom)
When the symbiote chose to separate itself from him, Eddie's cancer began spreading at an exponential rate. After the events of Brand New Day, Mr. Li cured him of his cancer and due to the remnants of symbiote left in his body, Eddie developed new powers. These remnants fused with Eddie's white blood cells resulting in a new white symbiote that grants Eddie the majority of his old powers along with powerful new ones as Anti-Venom.
White Symbiotic Costume: The alien costume's remnants remained grafted to the nervous system of Eddie Brock, and fused with his white blood cells. This new white symbiote seems to not only be different in appearance and abilities, but even acts completely different from the original symbiote it evolved from. For instance, Eddie Brock refers to himself in first person as Anti-Venom, and is in complete control of his actions. This relationship is somewhat similar to Cletus Kasady's and the Carnage symbiote: Both symbiotes are bonded to their hosts at the cellular level and seem to compliment the user's personality (the Carnage symbiote loves to kill, and the Anti-Venom symbiote wants to destroy Venom.) However the white symbiote, unlike the other members of its race, seemingly has no influence on Eddie's actions, which is a far cry from his first symbiotic relationship.
External Symbiote Rejection: Upon being assaulted by Mac Gargan, the Venom symbiote attempts to leave Gargan to bond with Brock again. However Brock's skin is caustic to his former symbiote, which means the white symbiote has the ability to reject the Venom symbiote and presumably all of its children as well.
Constituent-Matter Manipulation: Anti-Venom can manipulate his matter to enlarge or stretch his body in order to augment his attacks. For example, he enlarged his fist and slammed it into Mac Gargan creating more of an impact.
Impurity Sense: Anti-Venom can sense foreign substances within a person's body which includes symbiotes, radiation, narcotics, viruses and diseases.
Internal Bodily Cleansing: After sensing the impurity, Anti-Venom can forcefully "cure" the substance from the person's body. He uses this ability to almost completely destroy his old symbiote and to cure a young girl from her heroin addiction. This power can also be used to depower some superhumans, almost ridding Spider-Man of the radiation in his blood when attempting to destroy remnants of the symbiote, and nearly cleanses Radioactive Man of his powers in a similar fashion.
Spider-Power Negation: After failing to cleanse Spider-Man of his symbiote remnants and radiation in his blood, whenever Anti-Venom is too close to Peter his powers are effectively canceled until Eddie becomes distant enough from him.
Excluding these new powers granted by the white symbiote, Anti-Venom still retains almost every power Eddie had bonded with the Venom symbiote, including:
Accelerated Healing Factor
Immunity to Spider-man's Spider Sense
Former Powers (Venom)
Main article: Venom (Symbiote) (Earth-616)
Eddie Brock was the first individual to truly bond with the symbiote, seeing as Peter Parker did not allow it to complete the process, gaining many of the same powers Spider-Man possessed in conjunction with the symbiote's natural abilities.
Symbiotic Costume: The alien costume, which had grafted itself to the nervous system of Eddie Brock, somehow absorbed the powers of Spider-Man during its brief symbiotic relationship with him. These powers had been transferred to Brock, so long as he wore the costume, and combined with Eddie's natural bulk made Venom physically stronger than Spider-Man. The symbiote also kept Brock's cancer in check until they seperated. Ultimately the costume's influence hurt more than helped Brock's psyche, and when he finally realized this himself he decided to auction it.
Former Weaknesses (Venom)
The Venom symbiote, like all others of its kind, is extremely vulnerable to heat and sonic based attacks. They can cause the symbiote physical pain and discomfort, where as "more powerful" attacks might be completely ineffective.
Expert Reporter: Before his bonding with the symbiote, Eddie Brock was an incredibly skilled reporter for the Daily Globe, and knew how to investigate. He also had many sources of information in helping with his plans.
Class 60 (As Anti-Venom); Eddie Brock worked his body to peak human conditioning, able to lift 700 lb before his bonding with the Symbiote.Venom possessed superhuman strength enabling him to lift about 11 tons, however judging on some of the beings he has tangled with it appears his strength fluctuates. As Anti-Venom he is roughly as strong as Venom(Gargan)if not stronger as he was successfully able to trade punches; this would theoretically enable him to lift up to 40 tons.
Osborn's Cure: As the Anti-Venom, he can only be weakened by poisons that infect the body. The white symbiote takes the damage leaving Eddie powerless. Norman created the virus using Freak's DNA.
Mental Instability: Eddie has been repeatedly shown relapsing into his unstable "lethal protector" mindset. Recently as Anti-Venom he's seemingly reverted back to this persona, killing criminals just as offhandedly as before despite the obvious option of curing them of their drug addictions and actually helping them with his powers.