[contingencies]

For iOS, $500k was quoted in HN-featured media recently. However, $750k was quoted on HN in response to a query perhaps two years ago.

[imron]

The same company I linked above issued a $1 million bounty for an iOS remote jailbreak vuln late last year (for a maximum of 3 different winners).

By the time the bounty expired only 1 team had won.

https://www.zerodium.com/ios9.html

So pricing has some fluidity, but you're looking at at least 500k.