diff --git a/src/celeste/core.py b/src/celeste/core.py
index 79e62e0..2eb8e21 100644
--- a/src/celeste/core.py
+++ b/src/celeste/core.py
@@ -26,6 +26,7 @@ class Provider(StrEnum):
     GROQ = "groq"
     GRADIUM = "gradium"
     OLLAMA = "ollama"
+    OPENROUTER = "openrouter"
 
 
 class Protocol(StrEnum):
diff --git a/src/celeste/credentials.py b/src/celeste/credentials.py
index 9c31541..163d699 100644
--- a/src/celeste/credentials.py
+++ b/src/celeste/credentials.py
@@ -75,6 +75,7 @@ class Credentials(BaseSettings):
     bfl_api_key: SecretStr | None = Field(None, alias="BFL_API_KEY")
     groq_api_key: SecretStr | None = Field(None, alias="GROQ_API_KEY")
     gradium_api_key: SecretStr | None = Field(None, alias="GRADIUM_API_KEY")
+    openrouter_api_key: SecretStr | None = Field(None, alias="OPENROUTER_API_KEY")
 
     model_config = {
         "env_file": find_dotenv(),
diff --git a/src/celeste/modalities/text/models.py b/src/celeste/modalities/text/models.py
index 04256a7..4b5b328 100644
--- a/src/celeste/modalities/text/models.py
+++ b/src/celeste/modalities/text/models.py
@@ -12,6 +12,7 @@
 from .providers.moonshot.models import MODELS as MOONSHOT_MODELS
 from .providers.ollama.models import MODELS as OLLAMA_MODELS
 from .providers.openai.models import MODELS as OPENAI_MODELS
+from .providers.openrouter.models import MODELS as OPENROUTER_MODELS
 from .providers.xai.models import MODELS as XAI_MODELS
 
 MODELS: list[Model] = [
@@ -25,5 +26,6 @@
     *MISTRAL_MODELS,
     *MOONSHOT_MODELS,
     *OPENAI_MODELS,
+    *OPENROUTER_MODELS,
     *XAI_MODELS,
 ]
diff --git a/src/celeste/modalities/text/providers/__init__.py b/src/celeste/modalities/text/providers/__init__.py
index 071e1bc..3d14b21 100644
--- a/src/celeste/modalities/text/providers/__init__.py
+++ b/src/celeste/modalities/text/providers/__init__.py
@@ -13,6 +13,7 @@
 from .moonshot import MoonshotTextClient
 from .ollama import OllamaTextClient
 from .openai import OpenAITextClient
+from .openrouter import OpenRouterTextClient
 from .xai import XAITextClient
 
 PROVIDERS: dict[Provider, type[TextClient]] = {
@@ -26,5 +27,6 @@
     Provider.MISTRAL: MistralTextClient,
     Provider.MOONSHOT: MoonshotTextClient,
     Provider.OPENAI: OpenAITextClient,
+    Provider.OPENROUTER: OpenRouterTextClient,
     Provider.XAI: XAITextClient,
 }
diff --git a/src/celeste/modalities/text/providers/openrouter/__init__.py b/src/celeste/modalities/text/providers/openrouter/__init__.py
new file mode 100644
index 0000000..89357dd
--- /dev/null
+++ b/src/celeste/modalities/text/providers/openrouter/__init__.py
@@ -0,0 +1,6 @@
+"""OpenRouter provider for text modality."""
+
+from .client import OpenRouterTextClient
+from .models import MODELS
+
+__all__ = ["MODELS", "OpenRouterTextClient"]
diff --git a/src/celeste/modalities/text/providers/openrouter/client.py b/src/celeste/modalities/text/providers/openrouter/client.py
new file mode 100644
index 0000000..40802cf
--- /dev/null
+++ b/src/celeste/modalities/text/providers/openrouter/client.py
@@ -0,0 +1,20 @@
+"""OpenRouter text client (OpenResponses protocol)."""
+
+from typing import ClassVar
+
+from celeste.modalities.text.protocols.openresponses.client import (
+    OpenResponsesTextClient,
+    OpenResponsesTextStream,
+)
+from celeste.providers.openrouter.config import DEFAULT_BASE_URL
+
+
+class OpenRouterTextClient(OpenResponsesTextClient):
+    """OpenRouter — OpenResponses with default https://openrouter.ai/api."""
+
+    _default_base_url: ClassVar[str] = DEFAULT_BASE_URL
+
+
+OpenRouterTextStream = OpenResponsesTextStream
+
+__all__ = ["OpenRouterTextClient", "OpenRouterTextStream"]
diff --git a/src/celeste/modalities/text/providers/openrouter/models.py b/src/celeste/modalities/text/providers/openrouter/models.py
new file mode 100644
index 0000000..d46bda4
--- /dev/null
+++ b/src/celeste/modalities/text/providers/openrouter/models.py
@@ -0,0 +1,5 @@
+"""OpenRouter models for text modality."""
+
+from celeste.models import Model
+
+MODELS: list[Model] = []
diff --git a/src/celeste/providers/__init__.py b/src/celeste/providers/__init__.py
index e9cbafc..fb92511 100644
--- a/src/celeste/providers/__init__.py
+++ b/src/celeste/providers/__init__.py
@@ -15,6 +15,7 @@
     moonshot,
     ollama,
     openai,
+    openrouter,
     xai,
 )
 
@@ -33,5 +34,6 @@
     "moonshot",
     "ollama",
     "openai",
+    "openrouter",
     "xai",
 ]
diff --git a/src/celeste/providers/openrouter/__init__.py b/src/celeste/providers/openrouter/__init__.py
new file mode 100644
index 0000000..eb10ce4
--- /dev/null
+++ b/src/celeste/providers/openrouter/__init__.py
@@ -0,0 +1,11 @@
+"""OpenRouter provider package for Celeste AI."""
+
+from celeste.core import Provider
+from celeste.credentials import register_auth
+
+register_auth(  # nosec B106 - env var name, not hardcoded password
+    provider=Provider.OPENROUTER,
+    secret_name="OPENROUTER_API_KEY",
+    header="Authorization",
+    prefix="Bearer ",
+)
diff --git a/src/celeste/providers/openrouter/config.py b/src/celeste/providers/openrouter/config.py
new file mode 100644
index 0000000..c149344
--- /dev/null
+++ b/src/celeste/providers/openrouter/config.py
@@ -0,0 +1,3 @@
+"""OpenRouter configuration."""
+
+DEFAULT_BASE_URL = "https://openrouter.ai/api"
diff --git a/src/celeste/telemetry.py b/src/celeste/telemetry.py
index bd3e929..1230c08 100644
--- a/src/celeste/telemetry.py
+++ b/src/celeste/telemetry.py
@@ -37,6 +37,7 @@
     Provider.XAI: "x_ai",
     Provider.GROQ: "groq",
     Provider.DEEPSEEK: "deepseek",
+    Provider.OPENROUTER: "openrouter",
     Provider.PERPLEXITY: "perplexity",
     Provider.COHERE: "cohere",
 }
diff --git a/tests/unit_tests/test_provider_api_templates.py b/tests/unit_tests/test_provider_api_templates.py
index 818f630..241e0b0 100644
--- a/tests/unit_tests/test_provider_api_templates.py
+++ b/tests/unit_tests/test_provider_api_templates.py
@@ -93,7 +93,7 @@ def _provider_api_client_files() -> list[Path]:
 
     # Wrapper providers that just re-export another provider's client
     # These don't need to match the template contract
-    wrapper_providers = {"ollama"}
+    wrapper_providers = {"ollama", "openrouter"}
 
     out: list[Path] = []
     for provider_dir in sorted([p for p in providers_dir.iterdir() if p.is_dir()]):