openai/gpt-oss-120bgpt-oss-120b is OpenAI’s open-weights AI model, released Aug 5, 2025. It costs $0.04/M input and $0.17/M output tokens, and handles a 131K-token context window.
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 production use cases.
Scores on standardized evaluations. Higher is better — and rank shows where gpt-oss-120b lands among all models tracked on Model Beat.
Graduate-level scientific reasoning
Frontier of human expert knowledge
Broad expert knowledge
Common-sense trick questions
Factual accuracy & hallucination
Novel ML problem-solving
Contamination-free coding
Scientific research coding
Olympiad-qualifier math
Multi-step agentic tasks
Autonomous task length
Command-line agentic tasks
Tool-agent-user reliability
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 production use cases.
gpt-oss-120b is an AI model developed by OpenAI, part of the GPT family, released Aug 5, 2025.
gpt-oss-120b is served from $0.04 per million input tokens and $0.17 per million output tokens (cheapest credible provider on OpenRouter: DeepInfra).
gpt-oss-120b supports a context window of up to 131K tokens.
On standardized evaluations tracked by Epoch AI, gpt-oss-120b scores 87.8% on LiveCodeBench, 88.9% on AIME 2024/2025, 48.2% on WeirdML.
gpt-oss-120b is released with open weights (Open weights (unrestricted)), so the model can be downloaded and self-hosted.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Jul 30, 2026.