Last refreshed 2026-05-11. Next refresh: weekly.
Why use gpt-oss-120b on GCP Vertex AI?
GCP Vertex AI offers gpt-oss-120b with pay-as-you-go pricing at $0.09/1M input tokens. Vertex AI is Google Cloud's managed AI platform, offering access to Gemini models and hundreds of partner models alongside tools for fine-tuning, grounding, vector search, and end-to-end MLOps pipelines.
Compare gpt-oss-120b across 7 providers to find the best fit for your use caseSetup recipe
Python + curlpip install google-cloud-aiplatformexport GOOGLE_CLOUD_PROJECT=...import os
import vertexai
from vertexai.generative_models import GenerativeModel
vertexai.init(project=os.environ["GOOGLE_CLOUD_PROJECT"], location="us-central1")gpt-oss-120bRequest example
import os
import vertexai
from vertexai.generative_models import GenerativeModel
# Reads GOOGLE_CLOUD_PROJECT from env; authenticates via Application Default Credentials
vertexai.init(project=os.environ["GOOGLE_CLOUD_PROJECT"], location="us-central1")
model = GenerativeModel("gpt-oss-120b")
response = model.generate_content("Hello")
print(response.text)Gotchas
- For Google-published models use the model name directly, e.g. "gemini-2.0-flash-001". For third-party publishers (Anthropic, Meta, etc.) use the full publisher path, e.g. "publishers/anthropic/models/claude-3-5-sonnet-v2@20241022".
- The examples expect GOOGLE_CLOUD_PROJECT; rename it only if your application config maps the new variable.
Compare gpt-oss-120b Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| OpenRouter | $0.04 | $0.18 |
| Together AI | $0.15 | $0.60 |
| Fireworks AI | $0.15 | $0.60 |
| GCP Vertex AI | $0.09 | $0.36 |
| NVIDIA NIM | — | — |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $0.09 |
| Output tokens | $0.36 |
Capabilities
About gpt-oss-120b
OpenAI open-weight model with 120 billion parameters. Text-only model supporting reasoning, function calling, and structured outputs. Free for self-hosting. Released August 5, 2025.
FAQ
What does gpt-oss-120b cost on GCP Vertex AI?
On GCP Vertex AI, gpt-oss-120b costs $0.09 per 1M input tokens and $0.36 per 1M output tokens.
What is the context window for gpt-oss-120b on GCP Vertex AI?
gpt-oss-120b supports a 131,072 token context window on GCP Vertex AI.
How does GCP Vertex AI compare to other gpt-oss-120b providers?
gpt-oss-120b is available from 7 providers. The cheapest input pricing is $0.039/1M tokens from OpenRouter.
Who created gpt-oss-120b?
gpt-oss-120b was created by OpenAI as part of the GPT-OSS model family.
Is gpt-oss-120b open source?
gpt-oss-120b is open source according to the seed data.