gpt-oss-120b (free) API Cost Calculator
Estimate your monthly API costs for gpt-oss-120b (free) from Openai.
Pricing per 1M tokens
Pricing last verified: Mar 21, 2026
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Cost Breakdown
Compare with Similar Models
| Model | Input/1M | Output/1M |
|---|---|---|
| gpt-oss-20b (free) Openai | $0.00 | $0.00 |
| gpt-oss-20b Openai | $0.0300 | $0.1400 |
| gpt-oss-120b Openai | $0.0390 | $0.1900 |
| gpt-oss-safeguard-20b Openai | $0.0750 | $0.3000 |
| GPT-5 Nano Openai | $0.0500 | $0.4000 |
Frequently Asked Questions
How much does gpt-oss-120b (free) cost per token?
gpt-oss-120b (free) is priced at $0.00 per 1M input tokens and $0.00 per 1M output tokens. Use the calculator above to estimate your monthly costs based on your usage volume.
What is the context window for gpt-oss-120b (free)?
gpt-oss-120b (free) has a context window of 131.1K tokens (131,072 tokens). The maximum output length is 131.1K tokens.
Does gpt-oss-120b (free) support function calling (tool use)?
Yes, gpt-oss-120b (free) supports function calling (also called tool use). You can define custom functions that the model can invoke as part of its responses.
How does gpt-oss-120b (free) compare to similar models?
gpt-oss-120b (free) costs $0.00 input and $0.00 output per 1M tokens. gpt-oss-120b (free) is competitively priced compared to gpt-oss-20b (free) ($0.00 input / $0.00 output per 1M tokens). See the "Compare with Similar Models" table above, or visit the gpt-oss-20b (free) page at /tools/cost-calculator/openai/gpt-oss-20b-free.