diff --git a/rig-core/src/providers/mod.rs b/rig-core/src/providers/mod.rs
index 53ca700f5..2bba1e6c2 100644
--- a/rig-core/src/providers/mod.rs
+++ b/rig-core/src/providers/mod.rs
@@ -11,6 +11,7 @@
 //! - DeepSeek
 //! - Azure OpenAI
 //! - Mira
+//! - YandexGPT
 //!
 //! Each provider has its own module, which contains a `Client` implementation that can
 //! be used to initialize completion and embedding models and execute requests to those models.
@@ -64,3 +65,4 @@ pub mod perplexity;
 pub mod together;
 pub mod voyageai;
 pub mod xai;
+pub mod yandex;
diff --git a/rig-core/src/providers/yandex.rs b/rig-core/src/providers/yandex.rs
new file mode 100644
index 000000000..4943feee7
--- /dev/null
+++ b/rig-core/src/providers/yandex.rs
@@ -0,0 +1,333 @@
+//! YandexGPT OpenAI-compatible provider.
+//!
+//! This provider reuses the OpenAI-compatible request/response shapes with
+//! a custom base URL and required `OpenAI-Project` header. The final model
+//! identifier is assembled as `gpt://<folder-id>/<model-name>` where the
+//! folder ID is provided via [`ClientBuilder::folder`].
+
+use crate::client::{
+    self, BearerAuth, Capabilities, Capable, DebugExt, Nothing, Provider, ProviderBuilder,
+    ProviderClient,
+};
+use crate::completion::{self, CompletionError, CompletionRequest as CoreCompletionRequest};
+use crate::embeddings::{self, EmbeddingError};
+use crate::http_client;
+use crate::http_client::HttpClientExt;
+use crate::providers::openai;
+use crate::wasm_compat::{WasmCompatSend, WasmCompatSync};
+use http::header::{HeaderName, HeaderValue};
+
+const YANDEX_API_BASE_URL: &str = "https://llm.api.cloud.yandex.net/v1";
+#[allow(dead_code)]
+const YANDEX_RESPONSES_API_BASE_URL: &str = "https://rest-assistant.api.cloud.yandex.net/v1";
+
+/// `yandexgpt-lite/latest` text model.
+pub const YANDEXGPT_LITE_LATEST: &str = "yandexgpt-lite/latest";
+/// `yandexgpt/latest` text model.
+pub const YANDEXGPT_LATEST: &str = "yandexgpt/latest";
+/// `yandexgpt/rc` (YandexGPT 5.1) text model.
+pub const YANDEXGPT_RC: &str = "yandexgpt/rc";
+
+/// `text-search-doc/latest` embedding model.
+pub const YANDEX_EMBED_TEXT_SEARCH_DOC: &str = "text-search-doc/latest";
+/// `text-search-query/latest` embedding model.
+pub const YANDEX_EMBED_TEXT_SEARCH_QUERY: &str = "text-search-query/latest";
+/// `text-embeddings/latest` embedding model.
+pub const YANDEX_EMBED_TEXT_EMBEDDINGS: &str = "text-embeddings/latest";
+
+#[derive(Debug, Clone, Default)]
+pub struct YandexExt {
+    folder: Option<String>,
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct YandexExtBuilder {
+    folder: Option<String>,
+}
+
+type YandexApiKey = BearerAuth;
+
+pub type Client<H = reqwest::Client> = client::Client<YandexExt, H>;
+pub type ClientBuilder<H = reqwest::Client> =
+    client::ClientBuilder<YandexExtBuilder, YandexApiKey, H>;
+
+impl YandexExt {
+    fn qualify_completion_model(&self, model: impl Into<String>) -> String {
+        let model = model.into();
+
+        if model.starts_with("gpt://") {
+            return model;
+        }
+
+        match &self.folder {
+            Some(folder) => format!("gpt://{folder}/{model}"),
+            None => model,
+        }
+    }
+
+    fn qualify_embedding_model(&self, model: impl Into<String>) -> String {
+        let model = model.into();
+
+        if model.starts_with("emb://") {
+            return model;
+        }
+
+        match &self.folder {
+            Some(folder) => format!("emb://{folder}/{model}"),
+            None => model,
+        }
+    }
+}
+
+impl From<YandexExtBuilder> for YandexExt {
+    fn from(value: YandexExtBuilder) -> Self {
+        Self {
+            folder: value.folder,
+        }
+    }
+}
+
+impl DebugExt for YandexExt {
+    fn fields(&self) -> impl Iterator<Item = (&'static str, &dyn std::fmt::Debug)> {
+        [("folder", (&self.folder as &dyn std::fmt::Debug))].into_iter()
+    }
+}
+
+impl Provider for YandexExt {
+    type Builder = YandexExtBuilder;
+
+    const VERIFY_PATH: &'static str = "/models";
+
+    fn build<H>(
+        builder: &client::ClientBuilder<Self::Builder, YandexApiKey, H>,
+    ) -> http_client::Result<Self> {
+        Ok(builder.ext().clone().into())
+    }
+}
+
+impl<H> Capabilities<H> for YandexExt {
+    type Completion = Capable<CompletionModel<H>>;
+    type Embeddings = Capable<EmbeddingModel<H>>;
+    type Transcription = Nothing;
+    #[cfg(feature = "image")]
+    type ImageGeneration = Nothing;
+    #[cfg(feature = "audio")]
+    type AudioGeneration = Nothing;
+}
+
+impl ProviderBuilder for YandexExtBuilder {
+    type Output = YandexExt;
+    type ApiKey = YandexApiKey;
+
+    const BASE_URL: &'static str = YANDEX_API_BASE_URL;
+
+    fn finish<H>(
+        &self,
+        mut builder: client::ClientBuilder<Self, Self::ApiKey, H>,
+    ) -> http_client::Result<client::ClientBuilder<Self, Self::ApiKey, H>> {
+        if let Some(folder) = &self.folder {
+            builder.headers_mut().insert(
+                HeaderName::from_static("openai-project"),
+                HeaderValue::from_str(folder)?,
+            );
+        }
+
+        *builder.ext_mut() = self.clone();
+
+        Ok(builder)
+    }
+}
+
+impl<H> ClientBuilder<H> {
+    /// Set the folder ID used for the `OpenAI-Project` header and model path.
+    pub fn folder(self, folder: impl Into<String>) -> Self {
+        self.over_ext(|mut ext| {
+            ext.folder = Some(folder.into());
+            ext
+        })
+    }
+}
+
+impl<H> Client<H> {
+    fn qualify_completion_model(&self, model: impl Into<String>) -> String {
+        self.ext().qualify_completion_model(model)
+    }
+
+    fn qualify_embedding_model(&self, model: impl Into<String>) -> String {
+        self.ext().qualify_embedding_model(model)
+    }
+}
+
+impl ProviderClient for Client {
+    type Input = YandexApiKey;
+
+    /// Create a new YandexGPT client using `YANDEX_API_KEY` and optional `YANDEX_FOLDER_ID`.
+    fn from_env() -> Self {
+        let api_key = std::env::var("YANDEX_API_KEY").expect("YANDEX_API_KEY not set");
+        let folder = std::env::var("YANDEX_FOLDER_ID").ok();
+        let base_url = std::env::var("YANDEX_BASE_URL").ok();
+
+        let mut builder = Client::builder().api_key(api_key);
+
+        if let Some(folder) = folder {
+            builder = builder.folder(folder);
+        }
+
+        if let Some(base_url) = base_url {
+            builder = builder.base_url(base_url);
+        }
+
+        builder.build().unwrap()
+    }
+
+    fn from_val(input: Self::Input) -> Self {
+        Self::new(input).unwrap()
+    }
+}
+
+fn to_openai_responses_client<T: Clone>(client: &Client<T>) -> openai::Client<T> {
+    client::Client::from_parts(
+        client.base_url().to_string(),
+        client.headers().clone(),
+        client.http_client().clone(),
+        openai::client::OpenAIResponsesExt,
+    )
+}
+
+fn to_openai_completions_client<T: Clone>(client: &Client<T>) -> openai::CompletionsClient<T> {
+    client::Client::from_parts(
+        client.base_url().to_string(),
+        client.headers().clone(),
+        client.http_client().clone(),
+        openai::client::OpenAICompletionsExt,
+    )
+}
+
+// ------------------------------------------------------------------
+// Completion wrapper
+// ------------------------------------------------------------------
+
+#[derive(Clone)]
+pub struct CompletionModel<T = reqwest::Client> {
+    inner: openai::CompletionModel<T>,
+}
+
+impl<T> CompletionModel<T> {
+    fn new(client: &Client<T>, model: impl Into<String>) -> Self
+    where
+        T: Clone + Default + std::fmt::Debug + 'static,
+    {
+        let inner = openai::CompletionModel::new(
+            to_openai_completions_client(client),
+            client.qualify_completion_model(model),
+        );
+
+        Self { inner }
+    }
+}
+
+impl<T> completion::CompletionModel for CompletionModel<T>
+where
+    T: HttpClientExt
+        + Default
+        + std::fmt::Debug
+        + Clone
+        + WasmCompatSend
+        + WasmCompatSync
+        + 'static,
+{
+    type Response = openai::CompletionResponse;
+    type StreamingResponse = openai::streaming::StreamingCompletionResponse;
+
+    type Client = Client<T>;
+
+    fn make(client: &Self::Client, model: impl Into<String>) -> Self {
+        Self::new(client, model)
+    }
+
+    async fn completion(
+        &self,
+        completion_request: CoreCompletionRequest,
+    ) -> Result<completion::CompletionResponse<Self::Response>, CompletionError> {
+        self.inner.completion(completion_request).await
+    }
+
+    async fn stream(
+        &self,
+        request: CoreCompletionRequest,
+    ) -> Result<
+        crate::streaming::StreamingCompletionResponse<Self::StreamingResponse>,
+        CompletionError,
+    > {
+        self.inner.stream(request).await
+    }
+}
+
+// ------------------------------------------------------------------
+// Embedding wrapper
+// ------------------------------------------------------------------
+
+#[derive(Clone)]
+pub struct EmbeddingModel<T = reqwest::Client> {
+    inner: openai::EmbeddingModel<T>,
+    ndims: usize,
+}
+
+impl<T> EmbeddingModel<T> {
+    fn new(client: &Client<T>, model: impl Into<String>, ndims: usize) -> Self
+    where
+        T: Clone + Default + std::fmt::Debug,
+    {
+        let inner = openai::EmbeddingModel::new(
+            to_openai_responses_client(client),
+            client.qualify_embedding_model(model),
+            ndims,
+        );
+
+        Self { inner, ndims }
+    }
+}
+
+impl<T> embeddings::EmbeddingModel for EmbeddingModel<T>
+where
+    T: HttpClientExt + Clone + std::fmt::Debug + Default + Send + 'static,
+{
+    const MAX_DOCUMENTS: usize = 1024;
+
+    type Client = Client<T>;
+
+    fn make(client: &Self::Client, model: impl Into<String>, ndims: Option<usize>) -> Self {
+        Self::new(client, model, ndims.unwrap_or_default())
+    }
+
+    fn ndims(&self) -> usize {
+        self.ndims
+    }
+
+    #[cfg_attr(feature = "worker", worker::send)]
+    async fn embed_texts(
+        &self,
+        documents: impl IntoIterator<Item = String> + crate::wasm_compat::WasmCompatSend,
+    ) -> Result<Vec<embeddings::Embedding>, EmbeddingError> {
+        // Yandex embeddings endpoint only accepts one string per request.
+        // Run per-item calls and reassemble.
+        let docs: Vec<String> = documents.into_iter().collect();
+        let mut results = Vec::with_capacity(docs.len());
+
+        for doc in docs {
+            let mut single = self.inner.embed_texts(vec![doc.clone()]).await?;
+            let Some(embed) = single.pop() else {
+                return Err(EmbeddingError::ResponseError(
+                    "Empty embedding response".to_string(),
+                ));
+            };
+
+            results.push(embeddings::Embedding {
+                document: doc,
+                vec: embed.vec,
+            });
+        }
+
+        Ok(results)
+    }
+}