Last refreshed 2026-04-19. Next refresh: weekly.
Why use gpt-oss-120b on Fireworks AI?
Fireworks AI offers gpt-oss-120b with pay-as-you-go pricing at $0.15/1M input tokens. Fireworks AI offers a generative AI platform as a service, focusing on rapid product iteration and cost-efficient AI deployment.
Compare gpt-oss-120b across 7 providers to find the best fit for your use caseSetup recipe
Python + curlpip install openaiexport FIREWORKS_API_KEY=...import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["FIREWORKS_API_KEY"],gpt-oss-120bRequest example
import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["FIREWORKS_API_KEY"],
base_url="https://api.fireworks.ai/inference/v1"
)
response = client.chat.completions.create(
model="gpt-oss-120b",
messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)Gotchas
- Fireworks model IDs use "accounts/fireworks/models/{model-name}" format, e.g. "accounts/fireworks/models/llama4-scout-instruct-basic" or "accounts/fireworks/models/deepseek-r1".
- The examples expect FIREWORKS_API_KEY; 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 | $0.15 |
| Output tokens | $0.60 |
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 Fireworks AI?
On Fireworks AI, gpt-oss-120b costs $0.15 per 1M input tokens and $0.6 per 1M output tokens.
What is the context window for gpt-oss-120b on Fireworks AI?
gpt-oss-120b supports a 131,072 token context window on Fireworks AI.
How does Fireworks 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.