Yahoos info is based on an independent option market, based on SPDRs(?), read so far they came into existance to compete against CBOEs index option monopoly back in 2005.
However, CBOE SPX front end is something like a few times greater than Yahoos SPYs, yet to look at details carefully.
Repost from weekend, CBOE SPX expiry tonight, recast as accumulative total rather than sum of accumulative total, as can see the number of options here by checking incremental difference between adjacent strike prices.
Example: there are bit over half million Put options between 700 (2.6m) and 800 (2m)
Haven't looked at changes over this week though,
thursday dodgy spi expiry day, page-63
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