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OpenAI
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...
Available via OpenRouter: create a free account at openrouter.ai, generate an API key, then call this model as openai/gpt-oss-20b through the OpenRouter API (or any OpenRouter-compatible app/client).
Grab a key at openrouter.ai/keys and call the model with its ID openai/gpt-oss-20b:
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-oss-20b",
"messages": [{"role": "user", "content": "Hello!"}]
}'Verified free entry points — terms change.
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Free tier for extremely fast inference of open models — useful when latency, not cost, is your bottleneck.
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Official: openrouter.ai/openai/gpt-oss-20b