
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In a regression model involving two variables, $y$ and $x$, four different models were selected with $R^2$ values of 0.78, 0.85, 0.61, and 0.31. Determine the model with the best fit based on its $R^2$ value.

Present the answer in LaTex format: \boxed{Your answer}
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