---
license: other
language:
- en
task_categories:
- text-generation
- question-answering
tags:
- long-context
- ruler
- niah
- needle-in-a-haystack
- 12m-context
- eval
- external-handoff
size_categories:
- n<1K
---

# RULER-12M NIAH Eval — external handoff

50 × `single_needle_uuid` samples at ~12 M tokens per sample. One of four
length variants (1 M / 2 M / 6 M / 12 M) prepared for the external
long-context retrieval handoff.

| field | value |
|---|---|
| samples | 50 |
| tasks | `{single_needle_uuid: 50}` |
| target tokens | 12,000,000 |
| seed | 1344 |
| negative_rate | 0.0 |

`eval/heldout/data.jsonl` is the chat-templated form, ready for
`model.forward()`; `eval/heldout/raw.jsonl` is the pre-template form
(tokenizer-agnostic — re-pack with `subq-data ruler-pack` against any
target tokenizer).