Get started with OpenAI’s GPT-OSS, open-source reasoning model duo.
reasoning
property:
openai/gpt-oss-120b
openai/gpt-oss-20b
developer
message which is used to provide information about the instructions for the model and available function tools.system
message which is used to specify reasoning effort, meta information like knowledge cutoff and built-in tools.max_tokens
of ~30,000 with this setting.max_tokens
parameter to control response length and costsmax_tokens
parameter