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Run gpt-oss-20b on Lium
OpenAI · Text generation · 20.9B parameters · 13.8 GB 5-bit weights · released 2025-08-04
It needs about 17 GB of VRAM. The cheapest setup that runs it is RTX A4500 (20 GB), from $0.16 per hour, billed per second.
Other GPUs that run it
How to run it
Rent the pod above, open a terminal over SSH or Jupyter and serve openai/gpt-oss-20b:
vllm serve openai/gpt-oss-20bClaude Code and Codex can do all of it through the Lium CLI.
Frequently asked questions
How much VRAM does gpt-oss-20b need?
About 13.8 GB for the released 5-bit weights, so plan on 17 GB with room for activations and KV cache at a short context. Longer contexts and bigger batches need more.
What GPU should I rent to run gpt-oss-20b?
RTX A4500 (20 GB). On Lium that setup costs from $0.16 per hour, billed per second with no minimum.
For AI agents (CLI install, agent skill, headless signup): llms-full.txt