Gemma 4 OpenCoder 40B-A8B v2 is a continued post-trained Gemma 4 coding model focused on agentic software engineering, long-context reasoning, and reliable tool use. It is designed for OpenCode workflows including repository navigation, implementation, editing, debugging, review, and sustained multi-file work.

The checkpoint contains approximately 42.4B text parameters and activates approximately 8.1B text parameters per token. It retains Gemma 4's native 262,144-token context window.

This BF16 release is a self-contained checkpoint using the standard Gemma 4 architecture. It does not require an adapter, external router, or auxiliary model.

Intended use

Agentic software engineering
OpenCode coding workflows
Long-context codebase navigation
Reasoning-enabled tool use
Multi-file implementation and editing
Debugging and code review

Run with reasoning and automatic tool calling enabled, and preserve the checkpoint's included chat template.

Model format

Weight format: BF16 safetensors
Architecture: Gemma 4 Mixture-of-Experts
Total text parameters: approximately 42.4B
Active text parameters: approximately 8.1B per token
Maximum context: 262,144 tokens

vLLM

bash

vllm serve LLMWildling/gemma-4-opencoder-40b-a8b-bf16-v2 \
  --tensor-parallel-size 2 \
  --reasoning-parser gemma4 \
  --tool-call-parser gemma4 \
  --enable-auto-tool-choice \
  --max-model-len 262144

Adjust tensor parallelism and context length for the available hardware. For OpenCode, select the served model and keep reasoning and tool calling enabled.