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Normative spec: the Isthmus specification is the canonical definition of this upgrade. This page records activation data and operational pointers; it does not restate the spec.
Isthmus brought Ethereum’s Pectra upgrade to the OP Stack and introduced the operator fee. Minimum component versions (from Upgrade 15 notice):

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What changed

Per the spec overview:
  • Pectra EIPs on L2, including EIP-7702 (set EOA account code), EIP-2537 (BLS12-381 precompiles), EIP-2935 (historical block hashes in state), and EIP-7623 (increased calldata cost). The EIP-7002 and EIP-7251 predeploy contracts and syscalls are not adopted by the OP Stack.
  • L2ToL1MessagePasser storage root in the block header.
  • Operator fee.
  • Smart contracts: predeploy, L1 block attributes, and SystemConfig updates.
The Upgrade 15 notice covers the operator steps that accompanied activation.