# New Embed, Rerank, Chat, and Classify APIs

We're excited to introduce improvements to our Chat, Classify, Embed, and Rerank APIs in a major version upgrade, making it easier and faster to build with Cohere. We are also releasing new versions of our Python, TypeScript, Java, and Go SDKs which feature `cohere.ClientV2` for access to the new API.

## New at a glance

- V2 Chat, Classify, Embed, and Rerank: `model` is a required parameter
- V2 Embed: `embedding_types` is a required parameter
- V2 Chat: Message and chat history are [combined](/guides/text-generation-v2-migrating-v1-to-v2#messages-and-preamble) in a single `messages` array
- V2 Chat: [Tools](/guides/text-generation-v2-tool-use-tool-use-parameter-types) are defined in JSON schema
- V2 Chat: Introduces `tool_call_ids` to [match tool calls with tool results](/guides/text-generation-v2-migrating-v1-to-v2#tool-call-id)
- V2 Chat: `documents` [supports a list of strings or a list of objects](/guides/text-generation-v2-migrating-v1-to-v2#documents) with document metadata
- V2 Chat streaming: Uses [server-sent events](/guides/text-generation-v2-migrating-v1-to-v2#streaming)

## Other updates

We are simplifying the Chat API by removing support for the following parameters available in V1:

- `search_queries_only`, which generates only a search query given a user’s message input. `search_queries_only` is not supported in the V2 Chat API today, but will be supported at a later date.
- `connectors`, which enables users to register a data source with Cohere for RAG queries. To use the Chat V2 API with web search, see our [migration guide](/guides/text-generation-v2-migrating-v1-to-v2) for instructios to implement a web search tool.
- `conversation_id`, used to manage chat history on behalf of the developer. This will not be supported in the V2 Chat API.
- `prompt_truncation`, used to automatically rerank and remove documents if the query did not fit in the model’s context limit. This will not be supported in the V2 Chat API.
- `force_single_step`, which forced the model to finish tool calling in one set of turns. This will not be supported in the V2 Chat API.
- `preamble`, used for giving the model task, context, and style instructions. Use a system turn at the beginning of your `messages` array in V2.
- `citation_quality`, for users to select between `fast` citations, `accurate` citations (slightly higher latency than fast), or citations `off`. In V2 Chat, we are introducing a top level `citation_options` parameter for all citation settings. `citation_quality` will be replaced by a `mode` parameter within `citation_options`.

See our Chat API [migration guide](/guides/text-generation-v2-migrating-v1-to-v2) for detailed instructions to update your implementation.

These APIs are in Beta and are subject to updates. We welcome feedback in our [Discord](https://discord.com/invite/co-mmunity) channel.

## Related pages

- [Changelog](../changelog.md)
- [Cohere](../index.md)
- [Cohere API](./cohere-api-index.md)
- [Cohere Labs](./cohere-labs-index.md)
- [Cohere Platform](./cohere-platform-index.md)
- [Cookbooks](./cookbooks-index.md)
- [Deployment Options](./deployment-options-index.md)
- [Embeddings (Vectors, Search, Retrieval)](./embeddings-vectors-search-retrieval-index.md)
- [Get Started](./get-started-index.md)
- [Going to Production](./going-to-production-index.md)

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