release: 5.37.0

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "5.36.0"
+  ".": "5.37.0"
 }

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 76
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/retell/retell-34c75afb2ecc24f4c428eb5402fc823a1fe309699c1c0b321db52d45b1f41b5e.yml
-openapi_spec_hash: bf87b12f54c30051abf0517dfbc2d593
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/retell/retell-05474670b76c31276c1956b211a508ef83a98460fdaf874ab8ff8adec07ca6f5.yml
+openapi_spec_hash: f90a89b2cf56a4dc802dfa049e1dadd5
 config_hash: 563668cc30bc4847932ba265108c000c

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## 5.37.0 (2026-05-11)
+
+Full Changelog: [v5.36.0...v5.37.0](https://github.com/RetellAI/retell-python-sdk/compare/v5.36.0...v5.37.0)
+
+### Features
+
+* **api:** api update ([5af4d59](https://github.com/RetellAI/retell-python-sdk/commit/5af4d59e59374bf64b3ed6fbd6d99d3e9209136a))
+
 ## 5.36.0 (2026-05-11)
 
 Full Changelog: [v5.35.1...v5.36.0](https://github.com/RetellAI/retell-python-sdk/compare/v5.35.1...v5.36.0)

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "retell-sdk"
-version = "5.36.0"
+version = "5.37.0"
 description = "The official Python library for the retell API"
 dynamic = ["readme"]
 license = "Apache-2.0"

src/retell/_version.py

@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "retell"
-__version__ = "5.36.0"  # x-release-please-version
+__version__ = "5.37.0"  # x-release-please-version

src/retell/resources/agent.py

@@ -276,12 +276,14 @@ def create(
                 "eleven_v3",
                 "sonic-3",
                 "sonic-3-latest",
+                "sonic-3.5",
                 "tts-1",
                 "gpt-4o-mini-tts",
                 "speech-02-turbo",
                 "speech-2.8-turbo",
                 "s1",
                 "s2-pro",
+                "s2.1-pro",
             ]
         ]
         | Omit = omit,
@@ -904,12 +906,14 @@ def update(
                 "eleven_v3",
                 "sonic-3",
                 "sonic-3-latest",
+                "sonic-3.5",
                 "tts-1",
                 "gpt-4o-mini-tts",
                 "speech-02-turbo",
                 "speech-2.8-turbo",
                 "s1",
                 "s2-pro",
+                "s2.1-pro",
             ]
         ]
         | Omit = omit,
@@ -1687,12 +1691,14 @@ async def create(
                 "eleven_v3",
                 "sonic-3",
                 "sonic-3-latest",
+                "sonic-3.5",
                 "tts-1",
                 "gpt-4o-mini-tts",
                 "speech-02-turbo",
                 "speech-2.8-turbo",
                 "s1",
                 "s2-pro",
+                "s2.1-pro",
             ]
         ]
         | Omit = omit,
@@ -2315,12 +2321,14 @@ async def update(
                 "eleven_v3",
                 "sonic-3",
                 "sonic-3-latest",
+                "sonic-3.5",
                 "tts-1",
                 "gpt-4o-mini-tts",
                 "speech-02-turbo",
                 "speech-2.8-turbo",
                 "s1",
                 "s2-pro",
+                "s2.1-pro",
             ]
         ]
         | Omit = omit,

src/retell/resources/llm.py

@@ -81,7 +81,8 @@ def create(
         | Omit = omit,
         model_high_priority: Optional[bool] | Omit = omit,
         model_temperature: float | Omit = omit,
-        s2s_model: Optional[Literal["gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]] | Omit = omit,
+        s2s_model: Optional[Literal["gpt-realtime-2", "gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
+        | Omit = omit,
         start_speaker: Literal["user", "agent"] | Omit = omit,
         starting_state: Optional[str] | Omit = omit,
         states: Optional[Iterable[llm_create_params.State]] | Omit = omit,
@@ -276,7 +277,8 @@ def update(
         | Omit = omit,
         model_high_priority: Optional[bool] | Omit = omit,
         model_temperature: float | Omit = omit,
-        s2s_model: Optional[Literal["gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]] | Omit = omit,
+        s2s_model: Optional[Literal["gpt-realtime-2", "gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
+        | Omit = omit,
         start_speaker: Literal["user", "agent"] | Omit = omit,
         starting_state: Optional[str] | Omit = omit,
         states: Optional[Iterable[llm_update_params.State]] | Omit = omit,
@@ -540,7 +542,8 @@ async def create(
         | Omit = omit,
         model_high_priority: Optional[bool] | Omit = omit,
         model_temperature: float | Omit = omit,
-        s2s_model: Optional[Literal["gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]] | Omit = omit,
+        s2s_model: Optional[Literal["gpt-realtime-2", "gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
+        | Omit = omit,
         start_speaker: Literal["user", "agent"] | Omit = omit,
         starting_state: Optional[str] | Omit = omit,
         states: Optional[Iterable[llm_create_params.State]] | Omit = omit,
@@ -735,7 +738,8 @@ async def update(
         | Omit = omit,
         model_high_priority: Optional[bool] | Omit = omit,
         model_temperature: float | Omit = omit,
-        s2s_model: Optional[Literal["gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]] | Omit = omit,
+        s2s_model: Optional[Literal["gpt-realtime-2", "gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
+        | Omit = omit,
         start_speaker: Literal["user", "agent"] | Omit = omit,
         starting_state: Optional[str] | Omit = omit,
         states: Optional[Iterable[llm_update_params.State]] | Omit = omit,

src/retell/types/agent_create_params.py

@@ -537,12 +537,14 @@ class AgentCreateParams(TypedDict, total=False):
             "eleven_v3",
             "sonic-3",
             "sonic-3-latest",
+            "sonic-3.5",
             "tts-1",
             "gpt-4o-mini-tts",
             "speech-02-turbo",
             "speech-2.8-turbo",
             "s1",
             "s2-pro",
+            "s2.1-pro",
         ]
     ]
     """Select the voice model used for the selected voice.

src/retell/types/agent_response.py

@@ -962,12 +962,14 @@ class AgentResponse(BaseModel):
             "eleven_v3",
             "sonic-3",
             "sonic-3-latest",
+            "sonic-3.5",
             "tts-1",
             "gpt-4o-mini-tts",
             "speech-02-turbo",
             "speech-2.8-turbo",
             "s1",
             "s2-pro",
+            "s2.1-pro",
         ]
     ] = None
     """Select the voice model used for the selected voice.

src/retell/types/agent_update_params.py

@@ -540,12 +540,14 @@ class AgentUpdateParams(TypedDict, total=False):
             "eleven_v3",
             "sonic-3",
             "sonic-3-latest",
+            "sonic-3.5",
             "tts-1",
             "gpt-4o-mini-tts",
             "speech-02-turbo",
             "speech-2.8-turbo",
             "s1",
             "s2-pro",
+            "s2.1-pro",
         ]
     ]
     """Select the voice model used for the selected voice.

src/retell/types/batch_call_create_batch_call_params.py

@@ -996,12 +996,14 @@ class TaskAgentOverrideAgent(TypedDict, total=False):
             "eleven_v3",
             "sonic-3",
             "sonic-3-latest",
+            "sonic-3.5",
             "tts-1",
             "gpt-4o-mini-tts",
             "speech-02-turbo",
             "speech-2.8-turbo",
             "s1",
             "s2-pro",
+            "s2.1-pro",
         ]
     ]
     """Select the voice model used for the selected voice.
@@ -1250,7 +1252,7 @@ class TaskAgentOverrideRetellLlm(TypedDict, total=False):
     tool calling, a lower value is recommended.
     """
 
-    s2s_model: Optional[Literal["gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
+    s2s_model: Optional[Literal["gpt-realtime-2", "gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
     """Select the underlying speech to speech model.
 
     Can only set this or model, not both.

src/retell/types/call_create_phone_call_params.py

@@ -1015,12 +1015,14 @@ class AgentOverrideAgent(TypedDict, total=False):
             "eleven_v3",
             "sonic-3",
             "sonic-3-latest",
+            "sonic-3.5",
             "tts-1",
             "gpt-4o-mini-tts",
             "speech-02-turbo",
             "speech-2.8-turbo",
             "s1",
             "s2-pro",
+            "s2.1-pro",
         ]
     ]
     """Select the voice model used for the selected voice.
@@ -1269,7 +1271,7 @@ class AgentOverrideRetellLlm(TypedDict, total=False):
     tool calling, a lower value is recommended.
     """
 
-    s2s_model: Optional[Literal["gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
+    s2s_model: Optional[Literal["gpt-realtime-2", "gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
     """Select the underlying speech to speech model.
 
     Can only set this or model, not both.

src/retell/types/call_create_web_call_params.py

@@ -1002,12 +1002,14 @@ class AgentOverrideAgent(TypedDict, total=False):
             "eleven_v3",
             "sonic-3",
             "sonic-3-latest",
+            "sonic-3.5",
             "tts-1",
             "gpt-4o-mini-tts",
             "speech-02-turbo",
             "speech-2.8-turbo",
             "s1",
             "s2-pro",
+            "s2.1-pro",
         ]
     ]
     """Select the voice model used for the selected voice.
@@ -1256,7 +1258,7 @@ class AgentOverrideRetellLlm(TypedDict, total=False):
     tool calling, a lower value is recommended.
     """
 
-    s2s_model: Optional[Literal["gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
+    s2s_model: Optional[Literal["gpt-realtime-2", "gpt-realtime-1.5", "gpt-realtime", "gpt-realtime-mini"]]
     """Select the underlying speech to speech model.
 
     Can only set this or model, not both.