Question 1

How much does GPT-OSS 120B cost?

Accepted Answer

GPT-OSS 120B costs $0.039 per 1 million input tokens and $0.19 per 1 million output tokens. This pricing is set by OpenAI.

Question 2

What tokenizer does GPT-OSS 120B use?

Accepted Answer

GPT-OSS 120B uses the o200k_base tokenizer. This is OpenAI's latest tokenizer, optimized for efficiency with a vocabulary of ~200,000 tokens.

Question 3

What is GPT-OSS 120B's context window?

Accepted Answer

GPT-OSS 120B supports a context window of 131K tokens (131,072 tokens). The maximum output length is 33K tokens.

Question 4

How does GPT-OSS 120B compare to other models?

Accepted Answer

You can compare GPT-OSS 120B's pricing and capabilities against other LLMs in the comparison table above, or visit the full pricing page for a side-by-side view of all models.

Question 5

How do I count tokens for GPT-OSS 120B?

Accepted Answer

Use the token counter at the top of this page or visit the homepage calculator. Paste your text and it will show the exact token count and cost for GPT-OSS 120B using the o200k_base tokenizer.

Model	Input / 1M	Output / 1M	Context	Max Output
GPT-OSS 120B	$0.039	$0.19	131K	33K
GPT-OSS 20B	$0.075	$0.3	131K	33K
Qwen3.5-9B	$0.05	$0.15	262K	33K
Llama 3.3 70B	$0.18	$0.18	131K	4K

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