Extended Variant

Route to long-context endpoints with :extended

The :extended variant requests endpoints configured for larger context windows, useful for long documents, retrieval-heavy prompts, and multi-turn memory.

json

{
  "model": "anthropic/claude-sonnet-4.5:extended",
  "messages": [
    { "role": "user", "content": "Analyze the attached 100-page policy and list risks." }
  ]
}

When to use extended

Prefer :extended when prompt truncation is a risk or when your tool pipeline injects large context payloads.