# Adjoint ODE behaviour

**URL:** <https://discourse.mc-stan.org/t/adjoint-ode-behaviour/24703>\
**Category:** CmdStan\
**Tags:** covid-19, ode, fitting-issues\
**Created:** [October 4, 2021, 2:31pm UTC](https://discourse.mc-stan.org/t/adjoint-ode-behaviour/24703 "2021-10-04T14:31:23Z")\
**Posts on this page:** 1\
**Showing post:** 28

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**Author:** ![bernadette-eu](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mc-stan.org/bernadette-eu/32/12054_2.png) [@bernadette-eu](https://discourse.mc-stan.org/u/bernadette-eu)\
**Post date:** [October 8, 2021, 11:14am UTC](https://discourse.mc-stan.org/t/adjoint-ode-behaviour/24703/28 "2021-10-08T11:14:43Z")

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Sure, I’ve added an [.html file](https://github.com/bernadette-eu/Bernadette/blob/master/Test_Adjoint/Model_description.html) in the same folder with the model description, data and initial. Just open it with your browser and let me know of any questions.

> does the famous rc2 version of the adjoint solver produce results which you trust?

So far I have only tested “cmdstan-2.27.0” and “cmdstan-ode-adjoint-v2”. How do I access the 2.27.0-rc2 version? I see that 2.28.0-rc2 [was made available recently](https://discourse.mc-stan.org/t/release-candidate-of-cmdstan-2-28-0/24604), if this is what you are refering to.

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