ember-1
Ember-1 is a reasoning model from Fireworks Research built on Kimi K3. It is designed to make every token go further by producing noticeably shorter reasoning traces.
Precio: Entrada: 720 créditos / 1 M de tokens (≈ $3.60); salida: 3600 créditos / 1 M de tokens (≈ $18.00).
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Ember-1 API on ModelFold
Ember-1 is a reasoning model from Fireworks Research built on Kimi K3. It is designed to make every token go further by producing noticeably shorter reasoning traces. Try Ember-1 in the ModelFold Playground, then call it from your own code through an OpenAI-compatible chat completions API.
What Is the Ember-1 API
Ember-1 at a glance
Ember-1 is a chat model from Fireworks AI. It accepts text and images as input and returns text, with a context window of up to 1M tokens.
Use it without hosting anything
On ModelFold you call Ember-1 with a single API key — no model weights to download and no inference servers to run. The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of Ember-1
Up to 1M tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Understands images
Besides text, Ember-1 accepts images as input, so a single request can combine instructions with visual or other media.
Function calling
Ember-1 supports tool (function) calling: describe your functions in the request and the model returns structured calls your code can run — the basis for agents and integrations.
Adjustable reasoning effort
Choose a reasoning effort level (low, medium or high) per request to balance depth of thinking against speed and token usage.
Structured outputs
Ask for JSON that follows a schema (response_format), which makes extraction, classification and system integrations more reliable.
How to Use Ember-1 on ModelFold
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Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how Ember-1 responds before writing any code.
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Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
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Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "ember-1" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
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Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
What You Can Build with Ember-1
Analysis and complex reasoning
Work through research questions, data interpretation, planning and other problems that need careful step-by-step reasoning.
High-volume pipelines
Run classification, extraction, rewriting and batch jobs at scale where cost per request matters.
AI coding assistants
Generate, explain, debug and refactor code, review pull requests and work through multi-file changes in developer tools and IDE plugins.
Autonomous agents
Build agents that plan multi-step tasks, call your tools and APIs, and keep working toward a goal across long sessions.
Frequently Asked Questions
What is Ember-1?⌄
Ember-1 is a reasoning model from Fireworks Research built on Kimi K3. It is designed to make every token go further by producing noticeably shorter reasoning traces.
Which inputs does Ember-1 support?⌄
Ember-1 accepts text and images and returns text. Through ModelFold you can send text and images (OpenAI-style image_url content); in the Playground you can also attach documents, which are converted to text.
How long is the context window of Ember-1?⌄
Up to 1M tokens, shared between your input and the model’s output.
Does Ember-1 support function calling?⌄
Yes. Ember-1 supports tools / function calling through the standard tools parameter of the chat completions API.
How is Ember-1 billed on ModelFold?⌄
Pay as you go by tokens: input and output tokens are charged at the per-million-token prices shown on this page. There is no monthly fee, and failed requests are not charged.
How do I call Ember-1 through the API?⌄
Send a POST request to https://modelfold.ai/v1/chat/completions with "model": "ember-1", using your ModelFold API key as the Bearer token.
| Entrada | 720 créditos 1M tokens≈ $3.60 |
| Salida | 3600 créditos 1M tokens≈ $18.00 |
Se cobra por token, con tarifas separadas para entrada y salida. Los tokens de razonamiento cuentan como salida. El entorno de pruebas aplica exactamente el mismo cálculo.
Leer la documentación de la API →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"ember-1","messages":[{"role":"user","content":"Hello"}]}'