The upcoming Claude mythos LLM

 There are rumors available about a new large language model called "Claude mythos" which wasn't released yet. Its not very hard to describe its potential features because existing large language models have a lots of disadvantages.

Chatgpt and co are able to generate source code for example in Python and C but they are not able to execute in a virtual environment. The human user will notice this restriction because the LLM generated code contains sometimes smaller errors. For example the python interpreter might report that in a line 30 something is wrong. The current situation in may 2026 is, that the user has to submit the error message from python to the chatgpt LLM and then the chatbot will create the improved version which might contain another error. It takes a lot of time to produce a runnable software with such a feedback loop.

Suppose a large language model has an internal python interpret which can execute sourcecode and improve it. This would lower the needed feedback loops with a human and allows the LLM to generate error free programs in the frist attempt.

In general its about an environment to test software or test the actions of a robot. The assumption is that Claude mythos will have such a built in environment which improves AI based software engineering drastically.

The proposed abilities of Claude mythos to find bugs in existing software project is perhaps working with the same method. Before its possible to find a bug and fix it, there is a need to simulate the software in a simulator. Such a simulator is used by human programmers since years, its mostly a Gnu compiler which converts c code into binary code plus a virtual machine which is qemu to run the software. Every possible bugfix is compiled first to verify that there is no error in the code and then the binary file is run in a simulator to verify if the software is fixing the problem. The chance is high is that claude mython works with a similar principle.

This would allow a computer not only to generate source code, but also determine the outcome of the generated code. Such an LLM would be more useful than existing LLM which do not have such features.