Composition, optically anisotropic film, and compound

A composition comprising:

• a silicon-containing compound selected from the group consisting of a compound A that satisfies Requirement (a1) to Requirement (a3) and a compound B that satisfies Requirement (b1) to Requirement (b4);
• and
• a liquid crystal compound,
• (a1) a value obtained by dividing a total number of methyl groups bonded to silicon atoms in a molecule by a molecular weight of the compound is 0.0140 or more,
• (a2) the compound A is represented by Formula (A1),
• in Formula (A1), A represents an aromatic ring which may have a substituent, an aliphatic ring which may have a substituent, or a group represented by A1-LA-A2, A1 and A2 each independently represent an aromatic ring which may have a substituent or an aliphatic ring which may have a substituent, and LA represents —C≡C— or —CH2—,
• Za1's each independently represent a chain-like alkylene group, —O—, —CO—, or a group formed by combining two or more selected from the group consisting of a chain-like alkylene group, —O—, —CO—, and —NRN—, and RN represents a hydrogen atom or a substituent,
• Ya1's each independently represent an aromatic ring which may have a substituent or an aliphatic ring which may have a substituent,
• Xa1's each independently represent a silicon-containing group having a Si—O—Si structure,
• n represents an integer of 2 or more, and
• m's each independently represent an integer of 1 or more,
• (a3) the compound A has a molecular weight of 500 to 8000,
• (b1) a value obtained by dividing a total number of methyl groups bonded to silicon atoms in a molecule by a molecular weight of the compound is 0.0140 or more,
• (b2) the compound B has two or more groups represented by -Lb1-Xb1,
• Lb1's each independently represent an alkylene group which may have a heteroatom or —O—, and
• Xb1 represents a monovalent group selected from the group consisting of groups represented by Formula (C-1) to Formula (C-3),
• in Formula (C-1), RC1 to RC3 each independently represent an alkyl group having 1 to 10 carbon atoms, and k represents an integer of 2 to 20,
• in Formula (C-2), RC4 represents an alkyl group having 1 to 10 carbon atoms, and Res and RC6 each independently represent an alkyl group having 1 to 10 carbon atoms or a group represented by Formula (C-1X),
• in Formula (C-3), RC7 to RC9 each independently represent an alkyl group having 1 to 10 carbon atoms or a group represented by Formula (C-1X),
• in Formula (C-1X), RC10 to RC12 each independently represent an alkyl group having 1 to 10 carbon atoms, and 1 represents an integer of 0 to 20,
• (b3) the compound B has a partial structure represented by *—(Zb1—Yb1)s—Wb1,
• * represents a bonding position,
• Zb1's each independently represent an alkylene group, —O—, —CO—, —NRN—, or a group formed by combining these groups, and RN represents a hydrogen atom or a substituent,
• Yb1's each independently represent an aromatic ring which may have a substituent or an aliphatic ring which may have a substituent,
• Wb1 represents a hydrogen atom or a substituent which does not contain a silicon atom, and
• s represents an integer of 1 or more,
• (b4) the compound B has a molecular weight of 500 to 8000.