Cause (Documented platform behavior): Graphiti depends on structured JSON output; reliability varies across OpenAI-compatible providers and small models.
Fix status: documented_behavior
Other error fragments:
- Could not extract JSON from model response: {text}
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/getzep/graphiti/6b4b56ff6f4b1e4e69c3c3c5487cf1b8762c483a/README.md (official_docs, unknown, documented_behavior): "Structured output and small models" section documents json_schema vs json_object modes and small-model failures.
- https://raw.githubusercontent.com/getzep/graphiti/6b4b56ff6f4b1e4e69c3c3c5487cf1b8762c483a/graphiti_core/llm_client/openai_base_client.py (official_docs, unknown, documented_behavior): Invalid response error text.
- https://raw.githubusercontent.com/getzep/graphiti/6b4b56ff6f4b1e4e69c3c3c5487cf1b8762c483a/graphiti_core/llm_client/anthropic_client.py (official_docs, unknown, documented_behavior): JSON extraction failure text for Anthropic client.
Search phrasings: graphiti ollama structured output json_object; graphiti Invalid response from LLM; graphiti local model extraction fails
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Entity/edge extraction or dedup fails with invalid/unparseable JSON from the model.
- Context
- Product: Graphiti (Zep) Component: OpenAIGenericClient structured output Operation: Running Graphiti with Ollama/vLLM/LM Studio via OpenAIGenericClient Affected versions: unknown Environment: unknown Exception: Exception, ValueError Packages: graphiti-core main at pinned SHA Trigger: Provider accepts json_schema response_format but does not constrain output, or a small model emits schema-mismatched JSON.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Invalid response from LLM: {response}
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Graphiti] Extraction failures with Ollama / OpenAI-compatible local models (structured output not honored): use structured_output_mode="json_object"
Recommended action: Set OpenAIGenericClient(structured_output_mode="json_object"), use the most capable model available, and keep SEMAPHORE_LIMIT low.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 177ecb72-dcb5-4546-98e3-f3b88067101b
- Proposed action
- Recommended action: Set OpenAIGenericClient(structured_output_mode="json_object"), use the most capable model available, and keep SEMAPHORE_LIMIT low.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.