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Stable DiffCoder

ByteDanceOpen WeightsPending Human Review

Stable DiffCoder is ByteDance’s 8B diffusion coding model, built on the Seed Coder architecture and training pipeline. Block-diffusion continual pretraining uses a tailored warmup and clipped noise schedule, followed by instruction tuning. It generates code through iterative parallel refinement and supports code completion, editing, and reasoning. MIT-licensed base and instruction weights and the training report enable controlled comparisons against autoregressive coding models. Its documented 8K context and specialized inference routine should be respected instead of assuming ordinary sequential decoding behavior.

2026-01-22
8B
Block-diffusion Transformer
MIT

Specifications

Parameters
8B
Architecture
Block-diffusion Transformer
License
MIT
Context Window
8,192 tokens
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
Seed
API Access
Not Available
Chat Interface
Not Available
Variants
Stable-DiffCoder-8B-InstructStable-DiffCoder-8B-Base

Capabilities & Limitations

Capabilities
code generationcode editingparallel text refinement
Known Limitations
Specialized diffusion inference is requiredContext is limited to 8K tokensGenerated code requires execution tests
Notable Use Cases
code completiondiffusion-language researchprogramming assistants

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