MedGemma 1.5
MedGemma 1.5 is the independently released 4B instruction-tuned update to MedGemma for medical text and image interpretation. It adds CT and MRI volume understanding, whole-slide pathology inputs, longitudinal chest X-ray analysis, anatomical localization, and structured extraction from medical reports and EHRs. It uses Gemma 3 with a medical-data-trained SigLIP image encoder and produces text. The weights are intended as a developer foundation requiring application-specific validation.
2026-01-13
4B
Gemma 3 decoder-only Transformer with grouped-query attention and a medical-data-trained SigLIP vision encoder
Health AI Developer Foundations terms of use
Specifications
- Parameters
- 4B
- Architecture
- Gemma 3 decoder-only Transformer with grouped-query attention and a medical-data-trained SigLIP vision encoder
- License
- Health AI Developer Foundations terms of use
- Context Window
- 131,072 tokens
- Max Output
- 8,192 tokens
- Type
- multimodal
- Modalities
- textimage
Benchmark Scores
Advanced Specifications
- Model Family
- Gemma
- Finetuned From
- gemma-3
- API Access
- Not Available
- Chat Interface
- Not Available
- Variants
- medgemma-1.5-4b-it
- Hardware Support
- GPUTPUCPU
Capabilities & Limitations
- Capabilities
- medical image understandingmedical text reasoning3D scan analysispathology interpretationdocument extraction
- Known Limitations
- This developer model is not a validated standalone clinical product.Multi-turn behavior has not been optimized or comprehensively evaluated.Performance must be validated for the intended population and imaging workflow.
- Notable Use Cases
- medical AI researchclinical-data extractionmedical imaging prototypes