Arbitrum vs Optimism

Architecture and execution

Arbitrum is listed as a Layer 2 network and is EVM-compatible. Optimism is listed as a Layer 2 network and is EVM-compatible.

Their consensus entries also differ: Arbitrum lists Optimistic rollup, while Optimism lists Optimistic rollup. That distinction describes how each network is designed; it is not a standalone quality score.

Capacity and confirmation cadence

Arbitrum and Optimism list the same published capacity: 4,000 TPS.

Optimism lists the shorter block time: 2s.

Published capacity and block-time figures are useful reference points, but they are not equivalent to observed throughput, finality, or application-specific performance. Evaluate the workload, settlement requirements, and tooling before drawing a conclusion.

Costs and participation

Arbitrum lists the lower reference fee: $0.10.

Arbitrum has no staking-reward rate in this reference dataset. Optimism has no staking-reward rate in this reference dataset.

Fees and reward rates can change with network conditions and policy. Treat the entries here as a comparable snapshot, not as live pricing or a return forecast.

Choose for the workload

• Start with compatibility. Both networks share the same EVM compatibility status. If your tooling already assumes the EVM, that constraint can matter more than a headline capacity figure.
• Match the workload. Compare the reference values that matter to the application: capacity, block time, and transaction fee. A lower fee is useful only if the network can serve your users reliably.
• Check the conditions. Review each network’s documentation, security model, ecosystem, and current operating conditions before deploying capital or production software. Treat published values as a snapshot, not a promise.

Bottom line: choose the network whose trade-offs fit the job and whose risks you can explain plainly. A comparison is useful when it narrows a decision—not when it manufactures a winner.