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Basic request

curl https://www.opencompress.ai/api/v1/chat/completions \
  -H "Authorization: Bearer sk-occ-your-key-here" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o-mini",
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {"role": "user", "content": "What is prompt compression and why does it matter?"}
    ]
  }'

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Streaming

curl https://www.opencompress.ai/api/v1/chat/completions \
  -H "Authorization: Bearer sk-occ-your-key-here" \
  -H "Content-Type: application/json" \
  -N \
  -d '{
    "model": "gpt-4o",
    "messages": [
      {"role": "user", "content": "Write a short story about AI."}
    ],
    "stream": true
  }'

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Specify a different model

curl https://www.opencompress.ai/api/v1/chat/completions \
  -H "Authorization: Bearer sk-occ-your-key-here" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "messages": [
      {"role": "user", "content": "Compare REST and GraphQL."}
    ]
  }'

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Response format

{
  "id": "gen-abc123",
  "object": "chat.completion",
  "created": 1772341560,
  "model": "gpt-4o-mini",
  "choices": [
    {
      "index": 0,
      "finish_reason": "stop",
      "message": {
        "role": "assistant",
        "content": "Prompt compression is..."
      }
    }
  ],
  "usage": {
    "prompt_tokens": 18,
    "completion_tokens": 145,
    "total_tokens": 163
  }
}
The response format is identical to the OpenAI Chat Completions API. Any tool that parses OpenAI responses will work unchanged.