DeepSeek V4 Pro

deepseek/deepseek-v4-pro

A chat model with a 1M-token context window, at $0.693 per million input tokens and $2.079 per million output tokens.

Details

Maker: deepseek
Kind: Chat
Context window: 1,000,000 tokens
Max output: 384,000 tokens
Input: $0.693 per million tokens
Cached input: $0.0231 per million tokens, 97% off
Cache write: Same as input
Output: $2.079 per million tokens
Capabilities: Reasoning, tool use
Takes: Text
Returns: Text
Zero data retention: Not on every provider
No training on requests: Not on every provider
Released: 2026-04-23
Newer model: deepseek/deepseek-v4.1-flash-1017Released later by the same maker, costs no more, and lists the same capabilities. Compare the two

Description

DeepSeek-V4 series incorporate several key upgrades in architecture and optimization: (1) a hybrid attention architecture that combines Compressed Sparse Attention (CSA) and Heavily Compressed Attention (HCA) to improve long-context efficiency; (2) ManifoldConstrained Hyper-Connections (mHC) that enhance conventional residual connections; (3) and the Muon optimizer for faster convergence and greater training stability

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek/deepseek-v4-pro",
    "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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