Thermal gravitons from the Gibbons-Hawking bath at the end of inflation are predicted to yield a MHz-band relic gravitational wave background with Ω_GW h^2 around 10^-18.
Similarly, we can also get the prediction for the inefficient reheating case as
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High-Frequency Thermal Graviton Remnant from the End of Inflation
Thermal gravitons from the Gibbons-Hawking bath at the end of inflation are predicted to yield a MHz-band relic gravitational wave background with Ω_GW h^2 around 10^-18.