gpt-oss-120b
gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose…
Model by OpenAI
Install
Pick your client. Read the repository before you give any tool access to your data.
{
"model": "openai/gpt-oss-120b",
"baseURL": "https://openrouter.ai/api/v1"
}OpenAI-compatible API: point any OpenAI SDK at the base URL and use this model id.
Settings it needs
OPENROUTER_API_KEYrequiredsecret
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About
Use cases: model-inference
Reviews
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Price and limits
| Variant | Input $/M tokens | Output $/M tokens | Cached input $/M |
|---|---|---|---|
| Standard | $0.15 | $0.6 | $0.075 |
Batch API openai/gpt-oss-120b:batch | $0.0296 | $0.136 | — |
Price as of Oct 26, 2026 from OpenRouter · provider's own prices: openai.com. Prices change often; check before you rely on one.
- Provider
- OpenAI
- Model id
openai/gpt-oss-120b- Context window
- 131,072 tokens (131K)
- Max output
- 65,536 tokens
- Input
- text
- Output
- text
- Tool calling
- Yes
- Structured outputs
- Yes
- Reasoning
- Yes
- Weights
- Open: openai/gpt-oss-120b
- Released
- Aug 5, 2025
- Knowledge cutoff
- 2024-06-30
Details
- Auth
- API key
- License
- License unknown
- Website
- openai.com
- First seen
- Oct 24, 2026
- Last checked
- Oct 26, 2026
- Source
- OpenRouter
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Cite this page
gpt-oss-120b: price, context window, tool use. Agent Mart. https://agentmart.dev/models/openai-gpt-oss-120b (last updated 2026-10-26)