Understand GEX expiry selections

GEX, OI, and related options metrics are calculated for a selected option expiry.

Changing the expiry can change the displayed levels, rankings, and regime context.

Available expiry modes

Where supported, TensorAlgo can offer selections such as:

• Default — uses the product's default expiry behavior for the instrument;
• 0DTE — same-day expiry;
• 1DTE — next-day expiry;
• Weekly — a supported weekly expiry.

Not every expiry mode is available for every instrument or session.

Fallback behavior

A workflow can use one of two fallback approaches:

• Next — use the next eligible expiry when the requested expiry is unavailable;
• Strict — require the requested expiry and do not silently replace it.

Default futures behavior

The current default behavior can differ by futures family.

NQ and ES commonly use the current short-dated expiry context, while GC and SI use a weekly context unless the user selects another supported mode.

The displayed expiry is authoritative for the current card or analysis.

Before comparing levels

Confirm:

• instrument;
• requested expiry mode;
• selected expiry;
• expiry date.

When an expiry is unavailable

Possible reasons include:

• the requested expiry does not exist for the instrument;
• the market is between expiry windows;
• the data is temporarily unavailable;
• Strict fallback behavior prevents a replacement expiry.

Try the default mode or another supported expiry.