diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ff680cbc..096ca9ea 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -28,6 +28,7 @@ jobs:
         pip install .
       env:
         OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+        ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
     - name: Build a binary wheel and a source tarball
       run: |
         python -m build --sdist --wheel --outdir dist/ .
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9034d40c..0dacf855 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -33,5 +33,6 @@ jobs:
     - name: Run Test
       env:
         OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+        ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
       run: |
          pytest tests
diff --git a/dev-requirements.txt b/dev-requirements.txt
index 11052e63..dd2be414 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -11,3 +11,4 @@ langchain_openai
 langchain_community
 faiss-cpu
 sentence_transformers
+anthropic
diff --git a/paperqa/llms.py b/paperqa/llms.py
index 1d70c4c5..db14da8b 100644
--- a/paperqa/llms.py
+++ b/paperqa/llms.py
@@ -69,19 +69,19 @@ def is_openai_model(model_name) -> bool:
     )
 
 
-def process_llm_config(llm_config: dict) -> dict:
+def process_llm_config(llm_config: dict, max_token_name: str = "max_tokens") -> dict:
     """Remove model_type and try to set max_tokens"""
     result = {k: v for k, v in llm_config.items() if k != "model_type"}
-    if "max_tokens" not in result or result["max_tokens"] == -1:
+    if max_token_name not in result or result[max_token_name] == -1:
         model = llm_config["model"]
         # now we guess - we could use tiktoken to count,
         # but do have the initative right now
         if model.startswith("gpt-4") or (
             model.startswith("gpt-3.5") and "1106" in model
         ):
-            result["max_tokens"] = 3000
+            result[max_token_name] = 3000
         else:
-            result["max_tokens"] = 1500
+            result[max_token_name] = 1500
     return result
 
 
@@ -336,6 +336,64 @@ async def achat_iter(self, client: Any, messages: list[dict[str, str]]) -> Any:
             yield chunk.choices[0].delta.content
 
 
+try:
+    from anthropic import AsyncAnthropic
+    from anthropic.types import ContentBlockDeltaEvent
+
+    class AnthropicLLMModel(LLMModel):
+        config: dict = Field(
+            default=dict(model="claude-3-sonnet-20240229", temperature=0.1)
+        )
+        name: str = "claude-3-sonnet-20240229"
+
+        def _check_client(self, client: Any) -> AsyncAnthropic:
+            if client is None:
+                raise ValueError(
+                    "Your client is None - did you forget to set it after pickling?"
+                )
+            if not isinstance(client, AsyncAnthropic):
+                raise ValueError(
+                    f"Your client is not a required AsyncAnthropic client. It is a {type(client)}"
+                )
+            return client
+
+        @model_validator(mode="after")
+        @classmethod
+        def set_llm_type(cls, data: Any) -> Any:
+            m = cast(AnthropicLLMModel, data)
+            m.llm_type = "chat"
+            return m
+
+        @model_validator(mode="after")
+        @classmethod
+        def set_model_name(cls, data: Any) -> Any:
+            m = cast(AnthropicLLMModel, data)
+            m.name = m.config["model"]
+            return m
+
+        async def achat(self, client: Any, messages: list[dict[str, str]]) -> str:
+            aclient = self._check_client(client)
+            completion = await aclient.messages.create(
+                messages=messages, **process_llm_config(self.config, "max_tokens")
+            )
+            return completion.content or ""
+
+        async def achat_iter(self, client: Any, messages: list[dict[str, str]]) -> Any:
+            aclient = self._check_client(client)
+            completion = await aclient.messages.create(
+                messages=messages,
+                **process_llm_config(self.config, "max_tokens"),
+                stream=True,
+            )
+            async for event in completion:
+                if isinstance(event, ContentBlockDeltaEvent):
+                    yield event.delta.text
+                # yield event.message.content
+
+except ImportError:
+    pass
+
+
 class LlamaEmbeddingModel(EmbeddingModel):
     embedding_model: str = Field(default="llama")
 
diff --git a/paperqa/version.py b/paperqa/version.py
index 10e958d2..216eb967 100644
--- a/paperqa/version.py
+++ b/paperqa/version.py
@@ -1 +1 @@
-__version__ = "4.0.0-pre.9"
+__version__ = "4.0.0-pre.10"
diff --git a/tests/test_paperqa.py b/tests/test_paperqa.py
index cf2c2a7d..47186fb9 100644
--- a/tests/test_paperqa.py
+++ b/tests/test_paperqa.py
@@ -17,6 +17,7 @@
     print_callback,
 )
 from paperqa.llms import (
+    AnthropicLLMModel,
     EmbeddingModel,
     LangchainEmbeddingModel,
     LangchainLLMModel,
@@ -454,6 +455,31 @@ async def ac(x):
 
         completion = await call(dict(animal="duck"), callbacks=[accum, ac])  # type: ignore[call-arg]
 
+    async def test_anthropic_chain(self):
+        from anthropic import AsyncAnthropic
+
+        client = AsyncAnthropic()
+        llm = AnthropicLLMModel()
+        call = llm.make_chain(
+            client,
+            "The {animal} says",
+            skip_system=True,
+        )
+
+        def accum(x):
+            outputs.append(x)
+
+        outputs: list[str] = []
+        completion = await call(dict(animal="duck"), callbacks=[accum])  # type: ignore[call-arg]
+        assert completion.seconds_to_first_token > 0
+        assert completion.prompt_count > 0
+        assert completion.completion_count > 0
+        assert str(completion) == "".join(outputs)
+
+        completion = await call(dict(animal="duck"))  # type: ignore[call-arg]
+        assert completion.seconds_to_first_token == 0
+        assert completion.seconds_to_last_token > 0
+
 
 def test_docs():
     docs = Docs(llm="babbage-002")