FireworksText Generation/v1/ai/chatReasoning

Ember-1 API

Access Ember-1 through one API key. Fireworks Efficient Reasoning on Kimi K3.

Ember-1 is a specialised reasoning model from Fireworks Research, built on Moonshot's Kimi K3. Ember-1 is for reasoning-heavy workloads where the cost is dominated by long thinking traces: it delivers the same answers with markedly fewer tokens.

Full Docs Get API Key

Takes 30 seconds.

Ember-1 API pricing

Pay per request from your YepAPI balance — no subscription, no monthly minimum. Prices updated September 27, 2026.

Token type	Price
Input	$4.43 / 1M tokens
Output (incl. reasoning)	$22.15 / 1M tokens
Context window	1.0M tokens

What it costs	Per job	Per 1,000
Chat reply1K input + 500 output tokens	$0.016	$15.50
RAG answer8K input + 800 output tokens	$0.053	$53.16
Agent step with tools30K input + 2K output tokens	$0.177	$177.20
Long document summary100K input + 2K output tokens	$0.487	$487.30

4,900+

Developers

2.3M+

API calls served

184

Endpoints

$0.01

Per call

Yep, that's it.

Try it live

Send a message and see Ember-1 respond in real time.

POST/v1/ai/chatfireworks/ember-1

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Ember-1 specs

Provider	Fireworks
Model ID	fireworks/ember-1
Endpoint	/v1/ai/chat
Type	Text Generation
Context window	1.05M tokens
Max output	944K tokens
Reasoning	Yes
OpenAI-compatible	Yes — /v1/ai/chat/completions

How to get an Ember-1 API key

1
Create an account
Sign up at yepapi.com with Google or email. It takes about 30 seconds.
2
Create an API key
Open the dashboard, go to API Keys and create a key. Copy it — it starts with yep_sk_.
3
Call Ember-1
Send a request to /v1/ai/chat with the x-api-key header and model "fireworks/ember-1".
4
Pay as you go
Usage is billed per request from your balance. Top up any amount; there is no subscription.

Strengths

✓

Shorter reasoning traces

Roughly 40% fewer reasoning tokens than its base for equivalent answers.

✓

Built on Kimi K3

Inherits Moonshot's Kimi K3 capability with a Fireworks efficiency post-train.

✓

1M context, very large output

Handles up to 1,048,576 input tokens and returns up to 943,718 output tokens per call.

✓

Tools and structured output

Function calling and JSON schema outputs.

Quick start

Copy this snippet and start making calls with Ember-1.

const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "model": "fireworks/ember-1",
    "messages": [
      {
        "role": "user",
        "content": "Explain API gateways in 2 sentences."
      }
    ],
    "maxTokens": 256
  }),
});
const { data } = await res.json();
console.log(data.message.content);

Ember-1 vs similar models

Every model below runs on the same API key — switch by changing the model ID.

Model	Provider	Price	Context
Ember-1	Fireworks	$4.43 in / $22.15 out per 1M	1.0M
Nemotron 3 Super	NVIDIA	$0 in / $0 out per 1M	262K
Qwen3.7 Flash	Qwen	$0.04 in / $0.19 out per 1M	1M
Solar Mini 4	Upstage	$0.07 in / $0.30 out per 1M	524K
Nemotron 3.5 Lightning	NVIDIA	$0.10 in / $0.30 out per 1M	262K
DeepSeek V4 Flash	DeepSeek	$0.13 in / $0.27 out per 1M	1.0M
Qwen 3.5 Flash	Qwen	$0.10 in / $0.38 out per 1M	1M
Seed 1.6 Flash	ByteDance	$0.11 in / $0.44 out per 1M	262K

Why use Ember-1 through YepAPI?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

Ember-1 API — pricing, context window & access

Ember-1 is a specialised reasoning model from Fireworks Research, built on Moonshot's Kimi K3. It pairs a 1,048,576-token context window with up to 943,718 output tokens per response, at $4.43 per 1M input and $22.15 per 1M output tokens through YepAPI.

Through YepAPI you call Ember-1 on an OpenAI-compatible endpoint with a single key — the same key that reaches GPT-6, Claude, Gemini, Grok and the SEO, SERP and scraping APIs. Input: text, images.

What is Ember-1?

Ember-1 is a specialised reasoning model from Fireworks Research, built on Moonshot's Kimi K3. It is designed to make every token go further: it produces shorter reasoning traces, using roughly 40% fewer tokens than the base model for the same answers, with text and image input, a 1,048,576-token context window and up to 943,718 output tokens at $4.43 / $22.15 per 1M tokens. It accepts text, images as input, handles up to 1,048,576 tokens of context and returns up to 943,718 output tokens per call.

Build with Ember-1 via YepAPI

YepAPI serves Ember-1 on the OpenAI-compatible /v1/ai/chat endpoint. Point your base URL at YepAPI, add your key, and set the model string to ember-1 (or the full fireworks/ember-1). Function calling, structured outputs and reasoning settings pass straight through, and switching to any other model on the platform is a one-string change per request.

Ember-1 API pricing — $4.43 / 1M input, $22.15 / 1M output

Ember-1 costs $4.43 per 1M input tokens and $22.15 per 1M output tokens through YepAPI, pay per token with no minimums. Failed calls are never charged, and every request is itemised in your dashboard API Logs so you can see exactly what a very long response cost.

Ember-1 use cases

Ember-1 is for reasoning-heavy workloads where the cost is dominated by long thinking traces: it delivers the same answers with markedly fewer tokens.

Start generating in 30 seconds

Pay per call, no subscriptions.

Get API Key

What developers say

“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
Marcus T.
SEO Platform Founder

“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
Priya S.
Full-Stack Developer

“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Jake R.
Indie Hacker

Frequently asked questions

Ember-1 costs $4.43 per 1M input tokens and $22.15 per 1M output tokens through YepAPI, billed per request with no monthly fee. For example, a chat reply (1K input + 500 output tokens) costs about $0.016.

Sign up at yepapi.com (Google or email, about 30 seconds), open the dashboard and create an API key. The same key works for Ember-1 and every other model — no separate Fireworks account or waitlist.

Use "fireworks/ember-1" as the model on /v1/ai/chat. The short alias "ember-1" also works.

Yes. Point the OpenAI SDK at https://api.yepapi.com/v1/ai with your YepAPI key and set model to "fireworks/ember-1". Streaming works the same way, so existing OpenAI code only needs the base URL and key changed.

Ember-1 supports a 1.0M token context window with up to 944K output tokens per request.