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DiffusionGemma

GoogleOpen WeightsPending Human Review

DiffusionGemma is an experimental open-weight text diffusion model built on the Gemma 4 26B A4B backbone. An autoregressive encoder caches context while a bidirectional decoder repeatedly denoises 256-token canvases, producing blocks of text in parallel. It accepts text and visual input and supports thinking and tools. It targets fast small-batch generation on a capable accelerator, trading some task accuracy for throughput relative to autoregressive Gemma 4.

2026-06-10
25.2B total / 3.8B active
Sparse MoE encoder-decoder with autoregressive prompt encoder, bidirectional diffusion decoder and 256-token generation canvases
Apache-2.0

Specifications

Parameters
25.2B total / 3.8B active
Architecture
Sparse MoE encoder-decoder with autoregressive prompt encoder, bidirectional diffusion decoder and 256-token generation canvases
License
Apache-2.0
Context Window
262,144 tokens
Type
multimodal
Modalities
textimagevideo

Benchmark Scores

Advanced Specifications

Model Family
Gemma
API Access
Not Available
Chat Interface
Not Available
Multilingual Support
Yes
Variants
diffusiongemma-26B-A4B-it
Hardware Support
GPUTPUCPU

Capabilities & Limitations

Capabilities
block text diffusionreasoningcodevisionfunction calling
Known Limitations
Reported speed gains depend on accelerator and batch size; high concurrency can remove the advantage.Task quality is lower than its autoregressive counterpart on several evaluations.Experimental runtime and sampling requirements differ from ordinary autoregressive models.
Notable Use Cases
local low-latency generationdiffusion-model researchsmall-batch assistants
Function Calling Support
Yes
Tool Use Support
Yes

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