# qwen/qwen3.5-9b @ darkbloom/fp4

- **TrackLLM** — machine-readable twin of [endpoints/qwen2fqwen3.5-9b23darkbloom2ffp4.html](https://www.trackllm.net/endpoints/qwen2fqwen3.5-9b23darkbloom2ffp4.html). Every page on the site has a `.md` sibling at the same path; links below point at those.
- **Atom feed** of this page's detected changes: [feeds/endpoints/qwen2fqwen3.5-9b23darkbloom2ffp4.xml](https://www.trackllm.net/feeds/endpoints/qwen2fqwen3.5-9b23darkbloom2ffp4.xml)
- **JSON** this page is rendered from: [data/models/qwen2fqwen3.5-9b.json](https://www.trackllm.net/data/models/qwen2fqwen3.5-9b.json) (model JSON) · [data/b3it/qwen2fqwen3.5-9b23darkbloom2ffp4/b3it.json](https://www.trackllm.net/data/b3it/qwen2fqwen3.5-9b23darkbloom2ffp4/b3it.json) (B3IT JSON)
- **Raw data** (every collected response): https://github.com/timothee-chauvin/trackllm_data · Built 2026-09-09 09:47 UTC

[Home](https://www.trackllm.net/index.md) / [qwen](https://www.trackllm.net/orgs/qwen.md) / [qwen3.5-9b](https://www.trackllm.net/models/qwen2fqwen3.5-9b.md) / @ darkbloom/fp4

Model: [qwen/qwen3.5-9b](https://www.trackllm.net/models/qwen2fqwen3.5-9b.md) · Served by: [Darkbloom](https://www.trackllm.net/providers/darkbloom.md) (fp4) · Organization: [qwen](https://www.trackllm.net/orgs/qwen.md) · Methods: `B3IT`

qwen3.5-9b is served by 3 providers (see the model page).
darkbloom serves 4 models (see the provider page).

## Tracking status

- **LT** — no logprobs: This endpoint does not return logprobs, so logprob tracking is impossible.
- **B3IT** — monitoring: This endpoint is actively monitored through its border inputs.

## Drift from baseline

Both signals measure how far this endpoint's behavior has moved from its reference period. LT tracks the average change in the returned tokens' log-probabilities (nats); B3IT tracks the total-variation distance of the border-input votes (0–1). Both should ideally be as close to 0 as possible.

Full series: [data/models/qwen2fqwen3.5-9b.json](https://www.trackllm.net/data/models/qwen2fqwen3.5-9b.json)

Full series: [data/b3it/qwen2fqwen3.5-9b23darkbloom2ffp4/b3it.json](https://www.trackllm.net/data/b3it/qwen2fqwen3.5-9b23darkbloom2ffp4/b3it.json)

## Detected changes

No change detected so far.

## Spend

What OpenRouter billed for tracking this endpoint. Spend recorded since 2026-09-08.

| Total to date | Last 30 days | Queries |
| --- | --- | --- |
| $0.024 | $0.024 | 20204 |

## Methods

- **LT — logprob tracking.** Primary signal where the provider returns logprobs. The drift is the mean absolute change in the returned tokens' log-probabilities versus the reference period (nats). A detected changepoint is published once the level shift across it — mean drift over the 7 days after minus the 7 days before — reaches 0.1 nats; that shift is the magnitude shown.
- **B3IT — border inputs.** Black-box fallback for endpoints that hide logprobs. Tracks how far the top-token votes on a ranked set of near-tie prompts have moved from the reference distribution (total variation, 0–1).

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Data collected via the OpenRouter API. [Home](https://www.trackllm.net/index.md) · [Changes](https://www.trackllm.net/changes.md) · [Providers](https://www.trackllm.net/providers.md) · [Endpoints](https://www.trackllm.net/endpoints.md) · [Methodology](https://www.trackllm.net/methodology.md) · [About](https://www.trackllm.net/about.md) · [GitHub](https://www.trackllm.net/github.md)