feat: Add gemini-3-pro-preview (#3950)

* Add gemini-3-pro-preview

Also refactors the tool support check for better forward compatibility.

* Add cassette for Gemini 3 Pro

---------

Co-authored-by: Greyson LaLonde <greyson.r.lalonde@gmail.com>

Author: markmcd

lib/crewai/src/crewai/cli/constants.py

@@ -145,6 +145,7 @@
         "claude-3-haiku-20240307",
     ],
     "gemini": [
+        "gemini/gemini-3-pro-preview",
         "gemini/gemini-1.5-flash",
         "gemini/gemini-1.5-pro",
         "gemini/gemini-2.0-flash-lite-001",

lib/crewai/src/crewai/llm.py

@@ -179,6 +179,7 @@ def writable(self) -> bool:
     "o3-mini": 200000,
     "o4-mini": 200000,
     # gemini
+    "gemini-3-pro-preview": 1048576,
     "gemini-2.0-flash": 1048576,
     "gemini-2.0-flash-thinking-exp-01-21": 32768,
     "gemini-2.0-flash-lite-001": 1048576,

lib/crewai/src/crewai/llms/constants.py

@@ -235,6 +235,7 @@
 ]
 
 GeminiModels: TypeAlias = Literal[
+    "gemini-3-pro-preview",
     "gemini-2.5-pro",
     "gemini-2.5-pro-preview-03-25",
     "gemini-2.5-pro-preview-05-06",
@@ -287,6 +288,7 @@
     "learnlm-2.0-flash-experimental",
 ]
 GEMINI_MODELS: list[GeminiModels] = [
+    "gemini-3-pro-preview",
     "gemini-2.5-pro",
     "gemini-2.5-pro-preview-03-25",
     "gemini-2.5-pro-preview-05-06",

lib/crewai/src/crewai/llms/providers/gemini/completion.py

@@ -1,5 +1,6 @@
 import logging
 import os
+import re
 from typing import Any, cast
 
 from pydantic import BaseModel
@@ -100,9 +101,8 @@ def __init__(
         self.stop_sequences = stop_sequences or []
 
         # Model-specific settings
-        self.is_gemini_2 = "gemini-2" in model.lower()
-        self.is_gemini_1_5 = "gemini-1.5" in model.lower()
-        self.supports_tools = self.is_gemini_1_5 or self.is_gemini_2
+        version_match = re.search(r"gemini-(\d+(?:\.\d+)?)", model.lower())
+        self.supports_tools = bool(version_match and float(version_match.group(1)) >= 1.5)
 
     @property
     def stop(self) -> list[str]:
@@ -559,6 +559,7 @@ def get_context_window_size(self) -> int:
                 )
 
         context_windows = {
+            "gemini-3-pro-preview": 1048576,  # 1M tokens
             "gemini-2.0-flash": 1048576,  # 1M tokens
             "gemini-2.0-flash-thinking": 32768,
             "gemini-2.0-flash-lite": 1048576,

lib/crewai/tests/cassettes/test_gemini_models[gemini-gemini-3-pro-preview].yaml

@@ -0,0 +1,69 @@
+interactions:
+- request:
+    body: '{"contents":[{"role":"user","parts":[{"text":"What is the capital of France?"}]}],"generationConfig":{"stop_sequences":[]}}'
+    headers:
+      accept:
+      - '*/*'
+      accept-encoding:
+      - gzip, deflate
+      connection:
+      - keep-alive
+      content-length:
+      - '123'
+      content-type:
+      - application/json
+      host:
+      - generativelanguage.googleapis.com
+      user-agent:
+      - litellm/1.78.5
+    method: POST
+    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-3-pro-preview:generateContent
+  response:
+    body:
+      string: !!binary |
+        H4sIAAAAAAAC/21UW4+iSBh9719heGxmBgFvbDIPgKAgNwUV3OxDCSWU3KFApdP/fWl77XF2l6RI
+        5ftOnVN1ku+8vQwGhA+yAAUAw5r4Y/BnXxkM3u7/j16eYZjhvvEo9cUCVPgX9vN7e9r3EAyvH4cI
+        J4IDHxQIg2SQnwZyBTIfDlA9eH21QIXq19cfxLd/HY3yJoywjcIM4KaCHzRSvZbEWpL4YIlRytG8
+        a3eoGiukHPHm3jH2FNvMTC1qLlgS05RL42PVyPMdz1uFHpQuytZSBqcHf7PexMHK3mjJQjWKIbM+
+        MxFL6cvWMMfQFsOJ3UQk5j1hWmoxK1DrLqncyrpcQ+UY0uZog2oqkTmXiQ2f27ZBpS58MXBTxRbX
+        qdfsl25Vn5tswrUHeVhVxenW7kaG0cKdt2hjjxPUBYY26BAUvbqqw30AoG0eTMmzdImnIrI51+VY
+        xeqUl/HKs8ZgfBPF0bbtMDjMzxZSkv3KNuJgwTlYMkw9YEyKMcfkRvUmkiPpBqL486niJEuQKtE7
+        XibhpJy1AltrXSrjq+iEucKfK5z43Ci6bTu+VIVuRNecmwRN2gnbqQHH6lQ06eNM5ttpwEjZVOI3
+        umesM9qbcxMySprtbDYXaboQdioPMpuEy3U4VZrM6njN0rAk8Fh3/ON+E58FJPDtxD8upIWTbI/D
+        MrqM7RWj7VWo6kMFUgaj5Dpzsg8bE6GoIc+rJEcnau8qGNnZygGNcRO61nD5sXgyWbUQ+Z4XQhrX
+        3C6UyS2OTHAp2cUJVp0eSZqtyTuTy48XjmW0xLJVYRqYYmSZhatQ45ROKPZiXTZTxiq2ceDPIhii
+        7tBurqtSL7ylp5NRw5FUzJXsLkiRJs1BIi05Oxit51ToBF2oTGOvYTXjfJptR62SVdTB7W5aaJzq
+        nb9adAVFIii3gZE5Qz87C+ViVKa3eJ2f4pyiSzasywoHJA2klNL01IIYX6o55V8n3BUc8vKagLIp
+        d/pRZoatSfor/yx4bAYp/udP4mlc3r/2f/2aIqLKk/vUpHkAkwf8/QEgTihDdbSBoM6zD5jtmNbX
+        EBIoC+C1Lw9fHgJ3aqKpQQh1iEGfFOArD4iiytMCO3kMMzFv7kkx++R6ypX/beO8D4XfOvSI/vYf
+        1nrea6LkOW+eoqh/IkgQvt2zRnKdpzDpBZ5VHza8PLn1yJrfL0gz45d//Pq0cAerGn16FcK0d+87
+        +72/Yb9gi+DlrklUsC7yrIZK8IHbeV4/2Sy/LL9r50a3aquVZ2uPeHl/+RvdmjG6dAUAAA==
+    headers:
+      Alt-Svc:
+      - h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
+      Content-Encoding:
+      - gzip
+      Content-Type:
+      - application/json; charset=UTF-8
+      Date:
+      - Wed, 19 Nov 2025 08:56:53 GMT
+      Server:
+      - scaffolding on HTTPServer2
+      Server-Timing:
+      - gfet4t7; dur=2508
+      Transfer-Encoding:
+      - chunked
+      Vary:
+      - Origin
+      - X-Origin
+      - Referer
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-XSS-Protection:
+      - '0'
+    status:
+      code: 200
+      message: OK
+version: 1

lib/crewai/tests/llms/google/test_google.py

@@ -455,13 +455,11 @@ def test_gemini_model_capabilities():
     llm_2_0 = LLM(model="google/gemini-2.0-flash-001")
     from crewai.llms.providers.gemini.completion import GeminiCompletion
     assert isinstance(llm_2_0, GeminiCompletion)
-    assert llm_2_0.is_gemini_2 == True
     assert llm_2_0.supports_tools == True
 
     # Test Gemini 1.5 model
     llm_1_5 = LLM(model="google/gemini-1.5-pro")
     assert isinstance(llm_1_5, GeminiCompletion)
-    assert llm_1_5.is_gemini_1_5 == True
     assert llm_1_5.supports_tools == True
 
 

lib/crewai/tests/test_llm.py

@@ -259,6 +259,7 @@ def test_validate_call_params_no_response_format():
 @pytest.mark.parametrize(
     "model",
     [
+        "gemini/gemini-3-pro-preview",
         "gemini/gemini-2.0-flash-thinking-exp-01-21",
         "gemini/gemini-2.0-flash-001",
         "gemini/gemini-2.0-flash-lite-001",