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OpenAI: 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 production use cases. It activates 5.1B parameters per forward pass and is optimized...

Specifications

ProviderOpenAI
Model IDopenai/gpt-oss-120b
Context window131K tokens (131,072)
Modalitiestext → text
TokenizerGPT
Router sourcesOpenRouter, TrustedRouter, Vercel AI Gateway, Cloudflare
Released2025-08-05
Tracked since2026-11-14
PopularityNot in the ranked set
ReasoningMandatory

Pricing (per million tokens)

VariantSourceAPI IDInputOutputContext
standardOpenRouteropenai/gpt-oss-120b$0.15$0.6131K
batchOpenRouteropenai/gpt-oss-120b:batch$0.03$0.136131K
standardTrustedRouteropenai/gpt-oss-120b$0.032$0.179131K
standardVercel AI Gatewayopenai/gpt-oss-120b$0.1$0.5131K
standardCloudflareopenai/gpt-oss-120b$0.35$0.75—

Recorded price history

DateInput / 1MOutput / 1MContext
2026-11-14$0.35$0.75—
2026-11-14$0.1$0.5131K
2026-11-14$0.032$0.179131K
2026-11-14$0.15$0.6131K

Capabilities

Agentic tool useStructured outputsReasoning (always on)Controllable reasoningNo content storage (attested)Zero data retentionNo training on inputs (attested)

Trust flags come from TrustedRouter's per-provider attestations.

Supported parameters

frequency_penalty, include_reasoning, logit_bias, logprobs, max_tokens, min_p, presence_penalty, reasoning, reasoning_effort, repetition_penalty, response_format, seed, stop, structured_outputs, temperature, tool_choice, tools, top_a, top_k, top_logprobs, top_p