Kimi K3 Fast

moonshotai/kimi-k3-fast

A chat model with a 1M-token context window, at $4.725 per million input tokens and $23.625 per million output tokens.

Details

Maker: moonshotai
Kind: Chat
Context window: 1,000,000 tokens
Max output: 131,072 tokens
Input: $4.725 per million tokens
Cached input: $0.4725 per million tokens, 90% off
Cache write: Same as input
Output: $23.625 per million tokens
Capabilities: Reasoning, tool use, vision, file input
Takes: Text, image, pdf
Returns: Text
Zero data retention: Yes, on every provider
No training on requests: Yes, on every provider
Released: 2026-07-27

Description

Fast version of Kimi’s flagship model for long-horizon coding and end-to-end knowledge work, with a 1M-token context window.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "moonshotai/kimi-k3-fast",
    "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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