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OpenAI: gpt-oss-120b

openai/gpt-oss-120b

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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 to run on a single H100 GPU with native MXFP4 quantization. The model supports configurable reasoning depth, full chain-of-thought access, and native tool use, including function calling, browsing, and structured output generation.

Modalities
In / Out Price
$0.03 / $0.17per 1M
Context
131K
Released
Aug 5, 2025
Knowledge Cutoff
Jun 2024
Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), Floor (cheapest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for OpenAI: gpt-oss-120b (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial Analysisgpt-oss-120b (High) Intelligence Index11.6
Artificial Analysisgpt-oss-120b (High) Coding Index30.4
Artificial Analysisgpt-oss-120b (High) Agentic Index3.7
Artificial Analysisgpt-oss-120b (High) GPQA Diamond78.2%
Artificial Analysisgpt-oss-120b (High) HLE19.6%
Artificial Analysisgpt-oss-120b (High) IFBench69.0%
Artificial Analysisgpt-oss-120b (High) τ²-Bench Telecom65.8%
Artificial Analysisgpt-oss-120b (High) AA-LCR52.0%
Artificial Analysisgpt-oss-120b (High) GDPval-AA5.6%
Artificial Analysisgpt-oss-120b (High) CritPt1.1%
Artificial Analysisgpt-oss-120b (High) SciCode34.0%
Artificial Analysisgpt-oss-120b (High) Terminal-Bench Hard23.5%
Artificial Analysisgpt-oss-120b (High) AA-Omniscience Accuracy21.8%
Artificial Analysisgpt-oss-120b (High) AA-Omniscience Non-Hallucination Rate9.2%
Artificial Analysisgpt-oss-120b (low) Coding Index21.2
Artificial Analysisgpt-oss-120b (low) GPQA Diamond67.2%
Artificial Analysisgpt-oss-120b (low) HLE5.9%
Artificial Analysisgpt-oss-120b (low) IFBench58.3%
Artificial Analysisgpt-oss-120b (low) τ²-Bench Telecom45.0%
Artificial Analysisgpt-oss-120b (low) AA-LCR46.0%
Artificial Analysisgpt-oss-120b (low) GDPval-AA0.0%
Artificial Analysisgpt-oss-120b (low) CritPt0.0%
Artificial Analysisgpt-oss-120b (low) Terminal-Bench Hard5.3%
Artificial Analysisgpt-oss-120b (low) AA-Omniscience Accuracy19.8%
Artificial Analysisgpt-oss-120b (low) AA-Omniscience Non-Hallucination Rate8.6%
Design ArenaGPT OSS 120B Models Arena 3D Elo912
Design ArenaGPT OSS 120B Models Arena Code Categories Elo969
Design ArenaGPT OSS 120B Models Arena Data Visualization Elo995
Design ArenaGPT OSS 120B Models Arena Game Development Elo1005
Design ArenaGPT OSS 120B Models Arena UI Component Elo934
Design ArenaGPT OSS 120B Models Arena Website Elo974

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

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Not used in Standard routing:Why these endpoints are not used
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Throughput
585tok/s

P50, best across providers

Latency
0.15s

P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchBaseten79.1%--Baseten (US)77.9%--CoreWeave77.8%--Amazon Bedrock77.4%--Amazon Bedrock (EU)75.8%--MARA74.1%--NovitaAI73.7%--
+16 more providers
Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.52%

Availability over the last 3 days

Last 72 hours
Availability 99.52%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.58%
Without Routing
91.32%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

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Frequently asked questions

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 to run on a single H100 GPU with native MXFP4 quantization.

gpt-oss-120b costs $0.03/M input tokens and $0.17/M output tokens, with separate rates for Cache Read at $0.03/M tokens.

gpt-oss-120b has a 131,072 token context window. It supports up to 131,072 completion tokens.

Yes. gpt-oss-120b accepts tools and tool_choice for function calling on 16 of the 20 providers serving it, and requests that send tools are routed to those providers. It also supports structured outputs via a JSON schema in response_format.

gpt-oss-120b is served by 20 providers on OpenRouter: CoreWeave, DekaLLM, DeepInfra (Turbo), AkashML, Mancer, Crusoe, NovitaAI, DigitalOcean and 12 more. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

gpt-oss-120b was released on August 5, 2025. Its knowledge cutoff is June 30, 2024.

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