From 2c9111dc44785f6c3fdbb70895bf3d7e8fd90dbd Mon Sep 17 00:00:00 2001
From: perseus <51974392+tcconnally@users.noreply.github.com>
Date: Mon, 15 Jun 2026 20:27:02 +0000
Subject: [PATCH 1/2] fix: skip response_format for Deepseek provider

Deepseek's API returns 'response_format type is unavailable now'
when the response_format parameter is included. Added a provider
blocklist check in both base_llm.py (constant) and
openai/completion.py (gate).

Closes #5990
---
 lib/crewai/src/crewai/llms/base_llm.py                    | 4 ++++
 lib/crewai/src/crewai/llms/providers/openai/completion.py | 8 +++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/crewai/src/crewai/llms/base_llm.py b/lib/crewai/src/crewai/llms/base_llm.py
index 94d5eb6b9f..fe3df746ed 100644
--- a/lib/crewai/src/crewai/llms/base_llm.py
+++ b/lib/crewai/src/crewai/llms/base_llm.py
@@ -126,6 +126,10 @@ def get_current_call_id() -> str:
     return call_id
 
 
+# Providers that do not support the response_format parameter.
+# Deepseek: returns "response_format type is unavailable now"
+PROVIDERS_WITHOUT_RESPONSE_FORMAT: set[str] = {"deepseek"}
+
 class BaseLLM(BaseModel, ABC):
     """Abstract base class for LLM implementations.
 
diff --git a/lib/crewai/src/crewai/llms/providers/openai/completion.py b/lib/crewai/src/crewai/llms/providers/openai/completion.py
index d8972e1de4..202ac7f00b 100644
--- a/lib/crewai/src/crewai/llms/providers/openai/completion.py
+++ b/lib/crewai/src/crewai/llms/providers/openai/completion.py
@@ -1569,7 +1569,13 @@ def _prepare_completion_params(
         if self.is_o1_model and self.reasoning_effort:
             params["reasoning_effort"] = self.reasoning_effort
 
-        if self.response_format is not None:
+        # Skip response_format for providers that don't support it
+        # (e.g., Deepseek returns "response_format type is unavailable")
+        if (
+            self.response_format is not None
+            and self._extract_provider(self.model)
+            not in {"deepseek"}
+        ):
             if isinstance(self.response_format, type) and issubclass(
                 self.response_format, BaseModel
             ):

From 45c8aa790905e2cdb482dab2d38cd23992f4165a Mon Sep 17 00:00:00 2001
From: perseus <51974392+tcconnally@users.noreply.github.com>
Date: Mon, 15 Jun 2026 21:26:25 +0000
Subject: [PATCH 2/2] refactor: use PROVIDERS_WITHOUT_RESPONSE_FORMAT constant
 from base_llm

Addresses CodeRabbit review: import the centralized provider blocklist
instead of duplicating a hardcoded set literal.
---
 lib/crewai/src/crewai/llms/providers/openai/completion.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/crewai/src/crewai/llms/providers/openai/completion.py b/lib/crewai/src/crewai/llms/providers/openai/completion.py
index 202ac7f00b..59a635e22d 100644
--- a/lib/crewai/src/crewai/llms/providers/openai/completion.py
+++ b/lib/crewai/src/crewai/llms/providers/openai/completion.py
@@ -30,7 +30,7 @@
 
 from crewai.events.types.llm_events import LLMCallType
 from crewai.llms._finish_reason_utils import extract_choices_finish_reason_and_id
-from crewai.llms.base_llm import BaseLLM, JsonResponseFormat, llm_call_context
+from crewai.llms.base_llm import PROVIDERS_WITHOUT_RESPONSE_FORMAT, BaseLLM, JsonResponseFormat, llm_call_context
 from crewai.llms.hooks.base import BaseInterceptor
 from crewai.llms.hooks.transport import AsyncHTTPTransport, HTTPTransport
 from crewai.llms.providers.utils.common import safe_tool_conversion
@@ -1574,7 +1574,7 @@ def _prepare_completion_params(
         if (
             self.response_format is not None
             and self._extract_provider(self.model)
-            not in {"deepseek"}
+            not in PROVIDERS_WITHOUT_RESPONSE_FORMAT
         ):
             if isinstance(self.response_format, type) and issubclass(
                 self.response_format, BaseModel