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Favicon for openai

OpenAI: gpt-oss-120b

openai/gpt-oss-120b

Model weights
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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), 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. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

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.

Quick Start

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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$0.05$0.45--1.24s25 tps
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$0.055$0.385$0.020.81s28 tps
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$0.07$0.50--0.54s107 tps
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$0.10$0.50$0.100.20s228 tps
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$0.15$0.60------
--
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99.50%
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$0.15$0.60--0.58s75 tps
99.94%
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99.89%
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99.77%
$0.35$0.75$0.350.22s725 tps
99.67%
$0.09$0.36--0.29s153 tps
82.07%
$0.05$0.25--0.58s50 tps
91.71%

Throughput

715tok/s

P50, best across providers

Latency

0.14s

P50, best provider

AutoExacto Benchmarks
GPQA DiamondTAU-Bench
Amazon Bedrock
75.9%--
Amazon Bedrock
74.7%--
Phala
71.9%--
Parasail
76.2%66.3%
AkashML
76.1%65.5%
DigitalOcean
70.7%--
+14 more providers
Uptime (3d)

100.00%

Availability (3d)

99.69%

Availability over the last 3 days

Last 72 hours
Availability 99.69%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.69%
Without Routing
95.71%

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.

1.
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Mira
Mira is a Telegram-native AI assistant.
127Btokens
2.
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cvi-magic-tasks-ai-tagging
new
33.8Btokens
3.
Favicon for https://craftrpgs.com/?utm_source=openrouter
Craft
Build and play AI RPGs
16.7Btokens
4.
Favicon for https://app.makemycv.com/
MakeMyCV
new
11.2Btokens
5.
Favicon for https://openclaw.ai/
OpenClaw
OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.
9.55Btokens

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. It also supports structured outputs via a JSON schema in response_format.

gpt-oss-120b is served by 18 providers on OpenRouter: AkashML, CoreWeave, DeepInfra (Turbo), NovitaAI, SiliconFlow, DigitalOcean, Mancer, Google Vertex and 10 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.