Fireworks AI: GPT OSS 120B (Fireworks)

Name: GPT OSS 120B (Fireworks) API
Brand: Openai

stable

GPT OSS 120B (Fireworks) is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

accounts__fireworks__models__gpt-oss-120bgpt-ossreleased Aug 5, 2025

Provider Quick start

Context

131.1K

tokens

Max output

32.8K

tokens

Input

$0.15

per 1M

Output

$0.60

per 1M

Activity

Daily period usage

Aggregated managed Everstack traffic. Buckets below 5 tenants or 100 requests are withheld.

Providers

ProviderContextInput /MOutput /M

Pricing

Item	Price	Unit
Input	$0.15	per 1M tokens
Output	$0.60	per 1M tokens
Cache read	$0.015	per 1M tokens

Performance

Reliability

Compare

Compare usage and performance

Place this model beside up to three other catalog models.

Capabilities

Modalities

Input

Output

Details

Model ID: accounts__fireworks__models__gpt-oss-120b
Family: gpt-oss
Status: stable
Knowledge: -
Released: Aug 5, 2025

Gateway Config

API: 2024-01-01
Auth: FIREWORKS_API_KEY
Discovery: static
Provider type: meta

Quick Start

index.ts

import Everstack from "@everstack/node";const client = new Everstack({  apiKey: process.env.EVERSTACK_API_KEY!,  baseUrl: "https://{instance}.{region}.everstack.ai",});const completion = await client.chat.completions.create({  model: "@fireworks/accounts__fireworks__models__gpt-oss-120b",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL

https://api.fireworks.ai/inference/v1

Chat completions

https://api.fireworks.ai/inference/v1/chat/completions

Model

accounts__fireworks__models__gpt-oss-120b

Auth env

FIREWORKS_API_KEY

GPT OSS 120B (Fireworks) FAQ

How much does the GPT OSS 120B (Fireworks) API cost?

Through Fireworks AI, GPT OSS 120B (Fireworks) costs $0.15 per 1M input tokens and $0.60 per 1M output tokens.

What is the context window of GPT OSS 120B (Fireworks)?

GPT OSS 120B (Fireworks) accepts up to 131.1K tokens of context and returns up to 32.8K output tokens on Fireworks AI.

Which providers offer GPT OSS 120B (Fireworks)?

GPT OSS 120B (Fireworks) is available from Fireworks AI and Together AI. Everstack can route between them with automatic fallback when one is unavailable.

What can GPT OSS 120B (Fireworks) do?

GPT OSS 120B (Fireworks) supports chat, function calling and reasoning. It accepts text input.

How do I call GPT OSS 120B (Fireworks) through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @fireworks/accounts__fireworks__models__gpt-oss-120b. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.