gpt-oss-120b
VerifiedOpenAI LLM optimized for long-form text processing.
About gpt-oss-120b
gpt-oss-120b is built as a proprietary text-only LLM. Its architecture supports an extended context length of 131072 tokens, enabling coherent handling of lengthy inputs. OpenAI keeps the weights closed and does not release parameter counts.
The model suits applications that require sustained context across documents or multi-turn exchanges. Typical uses include summarization, question answering, and content generation where input length exceeds standard limits. Its closed distribution allows OpenAI to manage updates and access centrally.
Capabilities
How gpt-oss-120b compares
gpt-oss-120b (striped bar) vs other language models on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · gpt-oss-120b ranks #8 of 66
Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Long Document Analysis
The model handles long-context reasoning over 131072 tokens to process and extract insights from extensive reports or transcripts.
Software Development Workflows
It supports code generation combined with instruction following to assist in writing, debugging, and refactoring complex codebases.
Conversational Applications
Strong multi-turn dialogue and natural language understanding enable reliable interactive agents for customer service or tutoring scenarios.
Strengths & limitations
Strengths
- +Handles extended contexts well
- +Strong general reasoning ability
- +Versatile text generation
Limitations
- –Text-only modality
- –May produce hallucinations
- –Large model size increases inference cost
Cost calculator
Estimate what gpt-oss-120b would cost for your usage.
Based on gpt-oss-120b's $0.04/1M input · $0.18/1M output. Estimate only — actual cost varies by provider and caching.
Quick start
OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. Only the model slug changes between models.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const completion = await client.chat.completions.create({
model: "openai/gpt-oss-120b",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: openai/gpt-oss-120b
Editor's verdict
gpt-oss-120b is OpenAI's proprietary language models with a 131K-token context window.
At $0.18 per 1M output tokens, it is very cost-efficient for its class.
It is available through OpenAI's API and aggregators like OpenRouter.
Best suited to handles extended contexts well and strong general reasoning ability.
Frequently asked questions
The model provides a context length of 131072 tokens.
User reviews
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