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mkozakov committed Dec 1, 2024
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createdAt: "Mon Dec 2 2024 00:00:00 (MST)"
hidden: false
description: >-
Launch of Rerank 3.5 offers improved performance for long and short
documents with a context length of 4096. Rerank 3.5 is SOTA in both English and multilingual retrieval tasks
New model release: Rerank 3.5
---

We're pleased to announce the release of [Rerank 3.5](/docs/rerank-2) our newest and most performant foundational model for ranking. Rerank 3.5 has a context length of 4096, SOTA performance on Multilingual Retrieval tasks and Reasoning Capabilities. In addition, Rerank 3.5 has SOTA performance on BEIR and domains such as Finance, E-commerce, Hospitality, Project Management, and Email/Messaging Retrieval tasks.

In the rest of these release notes, we’ll provide more details about changes in the api.
In the rest of these release notes, we’ll provide more details about changes to the api.

## Technical Details

### API Changes:

The Rerank v2 API has the following major changes:
Along with the model, we are releasing V2 of the Rerank API. It includes the following major changes:
- `model` is now a required parameter
- `max_chunks_per_doc` has been replaced by `max_tokens_per_doc`; `max_tokens_per_doc` will determine the maximum amount of tokens a document can have before truncation. The default value for `max_tokens_per_doc` is 4096.
- support for passing a list of objects for the `documents` parameter has been removed - if your documents contain structured data, for best performance we recommend formatting them as [YAML strings](/docs/rerank-overview#example-with-structured-data).
- support for passing a list of objects for the `documents` parameter has been removed - if your documents contain structured data, for best performance we recommend formatting them as [YAML strings](/docs/rerank-overview#example-with-structured-data).

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