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fix(openai): support gpt-5.6 reasoning_effort with function tools #7169

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fix(openai): support gpt-5.6 reasoning_effort with function tools #7169

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11 changes: 10 additions & 1 deletion livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/llm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@
from openai.types.chat import ChatCompletionToolChoiceOptionParam, completion_create_params

from .models import (
_REASONING_EFFORT_NONE_MODELS,
CerebrasChatModels,
ChatModels,
CometAPIChatModels,
Expand All @@ -59,6 +60,11 @@

lk_oai_debug = int(os.getenv("LK_OPENAI_DEBUG", 0))

# models that reject any reasoning_effort value but "none" once function tools are attached
_REASONING_EFFORT_TOOL_REQUIRES_NONE_MODELS: frozenset[str] = frozenset(
{"gpt-5.6", "gpt-5.6-luna", "gpt-5.6-sol", "gpt-5.6-terra"}
)

Verbosity = Literal["low", "medium", "high"]
PromptCacheRetention = Literal["in_memory", "24h"]

Expand Down Expand Up @@ -124,7 +130,7 @@ def __init__(
super().__init__()

if not is_given(reasoning_effort) and _supports_reasoning_effort(model):
if model in ["gpt-5.1", "gpt-5.2", "gpt-5.4", "gpt-5.4-mini"]:
if model in _REASONING_EFFORT_NONE_MODELS:
reasoning_effort = "none"
else:
reasoning_effort = "minimal"
Expand Down Expand Up @@ -1025,6 +1031,9 @@ def chat(
if is_given(response_format):
extra["response_format"] = llm_utils.to_openai_response_format(response_format) # type: ignore

if tools and self._opts.model in _REASONING_EFFORT_TOOL_REQUIRES_NONE_MODELS:
extra["reasoning_effort"] = "none"

return LLMStream(
self,
model=self._opts.model,
Expand Down
24 changes: 24 additions & 0 deletions livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/models.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,10 @@
]
DalleModels = Literal["dall-e-2", "dall-e-3"]
ChatModels = Literal[
"gpt-5.6",
"gpt-5.6-luna",
"gpt-5.6-sol",
"gpt-5.6-terra",
"gpt-5.5",
"gpt-5.4",
"gpt-5.4-mini",
Expand Down Expand Up @@ -291,6 +295,10 @@

def _supports_reasoning_effort(model: ChatModels | str) -> bool:
return model in [
"gpt-5.6",
"gpt-5.6-luna",
"gpt-5.6-sol",
"gpt-5.6-terra",
"gpt-5.5",
"gpt-5.4",
"gpt-5.4-mini",
Expand All @@ -302,6 +310,22 @@ def _supports_reasoning_effort(model: ChatModels | str) -> bool:
]


# Lowest tier these accept is "none"; everything else in _supports_reasoning_effort falls back
# to "minimal", which the gpt-5.6 family rejects outright.
_REASONING_EFFORT_NONE_MODELS: frozenset[str] = frozenset(
{
"gpt-5.6",
"gpt-5.6-luna",
"gpt-5.6-sol",
"gpt-5.6-terra",
"gpt-5.4",
"gpt-5.4-mini",
"gpt-5.2",
"gpt-5.1",
}
)


@dataclass
class OpenRouterWebPlugin:
"""OpenRouter web search plugin configuration"""
Expand Down
4 changes: 2 additions & 2 deletions livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/responses/llm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,7 @@
from openai.types.shared_params import ResponsesModel

from ..log import logger
from ..models import _supports_reasoning_effort
from ..models import _REASONING_EFFORT_NONE_MODELS, _supports_reasoning_effort
from ..tools import OpenAITool

ServiceTier = Literal["auto", "default", "flex", "scale", "priority"]
Expand Down Expand Up @@ -242,7 +242,7 @@ def __init__(
super().__init__()

if not is_given(reasoning) and _supports_reasoning_effort(model):
if model in ["gpt-5.1", "gpt-5.2", "gpt-5.4", "gpt-5.4-mini"]:
if model in _REASONING_EFFORT_NONE_MODELS:
reasoning = Reasoning(effort="none")
else:
reasoning = Reasoning(effort="minimal")
Expand Down
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