refactor: use gpt-5-mini by default (#1505)

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## Description
Set gpt-5-mini back to default LLM as issues with it have been resolved

## Type of Change
<!-- Please check the relevant option -->
- [ ] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [ ] Code refactoring
- [ ] Performance improvement
- [ ] Other (please specify):

## Pre-submission Checklist
<!-- Please check all boxes that apply before submitting your PR -->
- [ ] **I have tested my changes thoroughly before submitting this PR**
- [ ] **This PR contains minimal changes necessary to address the
issue/feature**
- [ ] My code follows the project's coding standards and style
guidelines
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have added necessary documentation (if applicable)
- [ ] All new and existing tests pass
- [ ] I have searched existing PRs to ensure this change hasn't been
submitted already
- [ ] I have linked any relevant issues in the description
- [ ] My commits have clear and descriptive messages

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.

.env.template

@@ -16,7 +16,7 @@
 STRUCTURED_OUTPUT_FRAMEWORK="instructor"
 
 LLM_API_KEY="your_api_key"
-LLM_MODEL="openai/gpt-4o-mini"
+LLM_MODEL="openai/gpt-5-mini"
 LLM_PROVIDER="openai"
 LLM_ENDPOINT=""
 LLM_API_VERSION=""
@@ -36,7 +36,7 @@ EMBEDDING_MAX_TOKENS=8191
 
 # If using BAML structured output these env variables will be used
 BAML_LLM_PROVIDER=openai
-BAML_LLM_MODEL="gpt-4o-mini"
+BAML_LLM_MODEL="gpt-5-mini"
 BAML_LLM_ENDPOINT=""
 BAML_LLM_API_KEY="your_api_key"
 BAML_LLM_API_VERSION=""

cognee/infrastructure/llm/config.py

@@ -39,7 +39,7 @@ class LLMConfig(BaseSettings):
 
     structured_output_framework: str = "instructor"
     llm_provider: str = "openai"
-    llm_model: str = "openai/gpt-4o-mini"
+    llm_model: str = "openai/gpt-5-mini"
     llm_endpoint: str = ""
     llm_api_key: Optional[str] = None
     llm_api_version: Optional[str] = None
@@ -48,7 +48,7 @@ class LLMConfig(BaseSettings):
     llm_max_completion_tokens: int = 16384
 
     baml_llm_provider: str = "openai"
-    baml_llm_model: str = "gpt-4o-mini"
+    baml_llm_model: str = "gpt-5-mini"
     baml_llm_endpoint: str = ""
     baml_llm_api_key: Optional[str] = None
     baml_llm_temperature: float = 0.0