Ember-1

fireworks/ember-1

A chat model with a 1M-token context window, at $3.15 per million input tokens and $15.75 per million output tokens.

Details

Maker: fireworks
Kind: Chat
Context window: 1,048,576 tokens
Max output: 1,048,576 tokens
Input: $3.15 per million tokens
Cached input: $0.315 per million tokens, 90% off
Cache write: Same as input
Output: $15.75 per million tokens
Capabilities: Reasoning, tool use, vision
Takes: Text, image
Returns: Text
Zero data retention: Yes, on every provider
No training on requests: Yes, on every provider
Released: 2026-09-23

Description

Ember-1 is Fireworks’ research-preview reasoning model built on Kimi K3 for coding and agentic workflows. It supports image input, function calling, and a 1M-token context window. Fireworks reports approximately 40% fewer generated tokens while maintaining comparable quality across its evaluations, helping reduce the cost of workloads with extensive reasoning.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "fireworks/ember-1",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Set PHANTOM_KEY to your key. Any OpenAI client works with the base URL https://phantom.codes/v1.

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