GPT-OSS 20B

openai/gpt-oss-20b

openai

Open-weight 20B model (Apache 2.0), similar performance to o3-mini. Available on testnet for developer testing.

Code Examples

from blockrun_llm import LLMClient

# Testnet: Use testnet API endpoint
client = LLMClient(api_url="https://testnet.blockrun.ai/api")
response = client.chat("openai/gpt-oss-20b", "Hello!")

Pricing

Per Request$0.0010

Context128K tokens

Max Output16K tokens

Flat rate per request. No token counting.

Payment

Network

Base Sepolia

Currency

Testnet USDC

Protocol

x402

Pay per request with testnet USDC on Base Sepolia. Get testnet USDC from Circle faucet.

Try It

Send a message to try GPT-OSS 20B

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