Transforms (context-window management)

Automatically compress the prompt when it exceeds the model's context window:

resp, err := client.ChatComplete(ctx, messages,
    openrouter.WithModel("openai/gpt-4o-mini"),
    openrouter.WithTransforms("middle-out"),
)

"middle-out" drops content from the middle of the message history. Useful for long chats, but silently lossy — don't enable by default in code that needs deterministic inputs.

See examples/transforms/main.go.