Only by share price, which doesn't matter. By market cap, a far better (though still imperfect) measure of company value, GM is worth a little more.
TSLA ~$45.5B
GM ~$47B
Re:Elon Musk Settles SEC Fraud Charges
by thinkcontext on Saturday September 29, 2018 @06:02PM
(#18103147)
The stocks aren't really comparable. If you liquidated the companies GM would bring in many times Tesla. Tesla's value comes with a huge risk premium. Tesla was very close to going under a few months ago and it could still do so, if it doesn't execute right.
I don't know much about the auto industry, and don't really follow Tesla, but I do know that Tesla stock is worth almost an order of magnitude more than General Motors.