> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ionworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Ionworks DAE Solver

> The fast default solver behind every simulation on the platform, with automatic fallback to IDAKLU.

The **Ionworks DAE Solver** (`IonworksSolver`) is a faster drop-in replacement for PyBaMM's `IDAKLUSolver`. It returns the same results as IDAKLU and falls back to it automatically for models it can't accelerate.

It is the platform's **default solver** for every pipeline submission and SDK simulation — there is nothing to configure.

<Note>
  The fast path currently supports fixed output time steps only, with linear interpolation between the `t_eval` and `t_interp` points. Models with events (such as voltage cut-offs) are run through IDAKLU instead.
</Note>