It is not possible for current language models to match M3GAN or the T-800 characters in abilities or sentience.  

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##### Abilities
For starters, current language models lack the ability to control a robot body.  Immediately this can be seen to severely limit their abilities to perform most of the actions and expressions the characters are shown to be capable of on screen.  Even if they could, the characters M3GAN and T-800 both have fictional bodies with abilities far beyond any current real-world robot bodies.  Assuming a suitable body was built, and an interface to it adapted, current language models would be limited to controlling such a body with linguistic commands.  Imagine if you could only control your own body by typing words to command it.  As you can see, this does not allow the fluid range of motion and fast reaction times displayed by the characters in their respective movies.

##### Sentience
As for sentience, current language models are not known to possess any accepted definition of sentience. Most current language models work by probabilistic prediction of words or subwords.  They only respond based on what are the most probable word combinations to reply with, given all the word combinations seen in the texts they were trained on.  As such, they do not have an understanding of the meaning of the words, nor the ideas that combinations of words convey.  It is unknown the extent to which the characters M3GAN and T-800 are sentient, as they are fictional and cannot be subjected to rigorous testing, but they do appear to possess an understanding of ideas, people, and situations that exceed any current language model. 

##### Future
There is no known method by which current language models could be imbued with sentience.  If such a way were eventually found, it would be difficult to discern whether such a model could still even be considered in the category of "current language models", in the meaning it has today, as they would bear little resemblance to current language models.  The larger question, of whether any future language model could be sentient is still open to debate.  The current consensus trends towards language models suffering from the "grounding problem", as language alone seems insufficient for sentience.  One way this could, perhaps, be solved is by giving a model a body or other abilities, as mentioned above.  Yet, also as above, language models are unsuited to non-language tasks, such as controlling a robot body. Such a task would more likely fall to some other model that is not a language model at all, and most certainly not a current language model as we have today.
 
##### Further Reading
[Large language model](https://en.wikipedia.org/wiki/Large_language_model)
[Stochastic Parrots](https://en.wikipedia.org/wiki/Stochastic_parrot)
[The Chinese Room Thought Experiment](https://en.wikipedia.org/wiki/Chinese_room)
[Grounding Problem](https://en.wikipedia.org/wiki/Symbol_grounding_problem)
[M3GAN](https://en.wikipedia.org/wiki/M3GAN)
[T-800](https://en.wikipedia.org/wiki/Terminator_(character))

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I hope this helps explain why current language models are unable to match the abilities and sentience of fictional AGI characters such as M3GAN and the T-800, and were, in fact, never intended to do so.

Do you have further questions on this topic, or is there anything else I can assist you with?
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