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Thermochemical equilibrium is one of the most commonly used assumptions incurrent exoplanet retrievals. As the James Webb Space Telescope (JWST) andAriel launch draw near, assessing the underlying biases and assumptions madewhen applying self-consistent chemistry into spectral retrievals is crucial.Here we use the flexibility of TauREx 3.1 to cross-compare three state of theart chemical equilibrium codes: ACE, FastChem and GGchem. We simulate JWSTspectra for ACE, FastChem, GGchem and GGchem+condensation containing only C, H,O, N elements and spectra for FastChem, GGchem and GGchem+condensation with amore extensive range of elements giving seven simulated JWST spectra in totaland then cross-retrieve giving a total of 49 retrievals. Our analysisdemonstrates that like-for-like, all chemical codes retrieve the correctparameters to <1% of the truth. However, retrievals, where the containedelements do not match the truth, parameters such as metallicity deviate by 20%while maintaining extremely low uncertainties <1% giving false confidence. Thispoint is of major importance for future analyses on JWST and Ariel,highlighting that self-consistent chemical scheme that do not employ the properassumptions (missing species, fixed elemental ratios, condensation) are at riskof confidently biasing interpretations. Free chemistry retrievals employingparametric descriptions of the chemical profiles can provide alternativeunbiased explorations.

A comparison of chemical models of exoplanet atmospheres enabled by TauREx 3.1