> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# SessionCostItem

## Fields

| Field | Type | Required | Description | Example |
| - | - | - | - | - |
| `app_name` | *str* | :heavy\_check\_mark: | Published harness display label. | Hermes Agent |
| `app_slug` | *str* | :heavy\_check\_mark: | Stable public slug of the harness. | hermes-agent |
| `median_session_cost_usd` | *float* | :heavy\_check\_mark: | Median USD spend per sampled session. | 1.74 |
| `model_permaslug` | *str* | :heavy\_check\_mark: | Exact model permaslug. | anthropic/claude-4.8-opus |
| `turn_range` | [components.TurnRange](../components/turnrange.mdx) | :heavy\_check\_mark: | Inclusive session turn-count range. | 10-49-turns |