OpenAI: gpt-oss-20b (free)

Pricing, context window and lifecycle for openai/gpt-oss-20b:free, tracked from what the vendor publishes.

Price per million tokens

Facts

Supported parameters

frequency_penalty, include_reasoning, logprobs, max_tokens, presence_penalty, reasoning, reasoning_effort, repetition_penalty, response_format, seed, stop, structured_outputs, temperature, tool_choice, tools, top_k, top_logprobs, top_p

Other OpenAI models

• openai/gpt-3.5-turbo $0.500 in / $1.50 out
• openai/gpt-3.5-turbo-0613 $1.00 in / $2.00 out
• openai/gpt-3.5-turbo-16k $3.00 in / $4.00 out
• openai/gpt-3.5-turbo-instruct $1.50 in / $2.00 out
• openai/gpt-4 $30.00 in / $60.00 out
• openai/gpt-4-turbo $10.00 in / $30.00 out
• openai/gpt-4-turbo-preview $10.00 in / $30.00 out
• openai/gpt-4.1 $2.00 in / $8.00 out
• openai/gpt-4.1-mini $0.400 in / $1.60 out
• openai/gpt-4.1-nano $0.100 in / $0.400 out