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MedGemma 1.5

GoogleOpen WeightsPending Human Review

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

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