1# Message Batches — C#
2 
3## Message Batches API
4 
5```csharp
6var batch = await client.Messages.Batches.Create(new() {
7    Requests = [
8        new() { CustomID = "req-1", Params = new() { Model = "claude-opus-4-8", MaxTokens = 1024, Messages = [...] } },
9    ],
10});
11// Poll client.Messages.Batches.Retrieve(batch.ID) until ProcessingStatus == "ended",
12// then iterate client.Messages.Batches.Results(batch.ID).
13```
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