# k3r053n3: Kimi K3 OpenAI-compatible proxy gateway

A standalone, high-performance, zero-dependency Go proxy gateway that exposes a standard OpenAI-compatible API (`/v1/chat/completions` and `/v1/models`) for the **Kimi K3** model hosted on the [`cw-105/kimi-k3-gguf-demo`](https://cw-105-kimi-k3-gguf-demo.hf.space) Gradio space.

## Features

- **Zero external dependencies**: pure Go standard library (`net/http`, `encoding/json`, `bufio`, `bytes`, `crypto/rand`, `flag`, `strings`, `time`).
- **SOCKS5 proxy support**: zero-dependency built-in RFC 1928 / RFC 1929 SOCKS5 client supporting domain name resolution (`socks5h://`), IPv4/IPv6, and username/password authentication (via `-socks`, `-proxy`, or `ALL_PROXY`/`all_proxy`/`SOCKS5_PROXY`/`socks5_proxy` environment variables).
- **Reasoning effort support**: defaults to `"max"` reasoning effort out of the box, with support for `"max"`, `"high"`, `"low"`, and `"default"` (via `reasoning_effort` request field or CLI flag).
- **Real-time token streaming**: Server-Sent Events (SSE) streaming engine (`stream: true`) with separate token-by-token emission for `delta.reasoning_content` and `delta.content`.
- **Reasoning extraction**: clean separation of `<think>...</think>` internal thoughts into `reasoning_content` (streaming chunks and non-streaming messages) without leaking raw tags into `content`.
- **OpenAI-compatible tool calling**:
  - automatic tool definition formatting into system instructions.
  - multi-turn tool execution response formatting (`role: "tool"` / `role: "function"`).
  - real-time stream interceptor (`StreamToolInterceptor`) that catches `<tool_call>` blocks on the fly and emits standard OpenAI `delta.tool_calls` chunks with `finish_reason: "tool_calls"`.
  - non-streaming tool call parsing with structured `tool_calls` and `finish_reason: "tool_calls"`.
- **Backend & model routing**: route between multiple upstream backends (`direct:together`, `direct:fireworks`, `hf:together`, `hf:fireworks-ai`, `hf:featherless-ai`, `hf:baseten`) dynamically or via model suffix (`kimi-k3:together`, `kimi-k3:fireworks`, etc.).
- **Reliability & resilience**: automatic Fibonacci exponential backoff retry mechanism (`DoWithFibonacciRetry`) on upstream network connections.
- **Full CORS support**: ready for direct browser integration, web frontends, and OpenAI-compatible client libraries.

## Quick start

### Installation

Install directly with `go install`:

```bash
go install code.luxferre.top/luxferre/k3r053n3@latest
```

### Build from source

```bash
make k3r053n3
```

Or build manually with Go:

```bash
go build -trimpath -ldflags="-s -w" -o bin/k3r053n3 .
```

### Run

```bash
./bin/k3r053n3
```

By default, the server starts on port `8080` pointing to `https://cw-105-kimi-k3-gguf-demo.hf.space` with default reasoning effort `"max"` and default backend `"direct:together"`.

## CLI options

| Flag | Default | Description |
||||
| `-port` | `8080` | Port to listen on |
| `-endpoint` | `https://cw-105-kimi-k3-gguf-demo.hf.space` | Root URL of the Kimi K3 Gradio space |
| `-model` | `kimi-k3` | Exposed default model name |
| `-backend` | `direct:together` | Default Space backend (`direct:together`, `direct:fireworks`, `hf:together`, `hf:fireworks-ai`, `hf:featherless-ai`, `hf:baseten`) |
| `-reasoning` | `max` | Default reasoning effort (`max`, `high`, `low`, `default`) |
| `-max-tokens` | `8192` | Default max completion tokens (256 - 8192) |
| `-temperature` | `0.7` | Default sampling temperature (0.0 - 1.5) |
| `-socks`, `-proxy` | `""` | SOCKS5 proxy URL (`socks5://127.0.0.1:1080` or `socks5://user:pass@host:port`, also checks `ALL_PROXY`/`all_proxy`/`SOCKS5_PROXY`/`socks5_proxy` env vars) |
| `-user-agent`, `-ua` | Firefox 153 on Linux | Custom `User-Agent` header for upstream requests |

## Endpoints

- `GET /` - gateway health check and route overview
- `GET /v1/models` (or `GET /models`) - list of available models and backend mappings
- `POST /v1/chat/completions` (or `POST /chat/completions`) - OpenAI-compatible chat completions

## Usage examples

### 1. Models list

```bash
curl -s http://localhost:8080/v1/models
```

### 2. Standard chat completion (non-streaming)

```bash
curl -s http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kimi-k3",
    "messages": [
      {"role": "user", "content": "What is 25 * 4? Show brief work."}
    ],
    "stream": false
  }'
```

Response includes separated `reasoning_content` and `content`:

```json
{
  "id": "chatcmpl-88054d2e-2084-4bcd-b9fa-8e99e9267523",
  "object": "chat.completion",
  "created": 1788348384,
  "model": "kimi-k3",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "**25 × 4 = 100**\n\nQuick way: 25 × 4 = 25 × 2 × 2 = 50 × 2 = **100**\n\n(Think of it as 4 quarters = 1 dollar.)",
        "reasoning_content": "The user is asking a simple arithmetic question: 25 * 4..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 0,
    "completion_tokens": 0,
    "total_tokens": 0
  }
}
```

### 3. Real-time streaming with reasoning deltas

```bash
curl -s -N http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kimi-k3",
    "messages": [
      {"role": "user", "content": "Tell me a 1-sentence joke about computers."}
    ],
    "stream": true
  }'
```

Output delivers real-time `delta.reasoning_content` chunks during thinking, followed by `delta.content` chunks for the answer, ending with `[DONE]`:

```
data: {"id":"chatcmpl-...","object":"chat.completion.chunk","created":1788348397,"model":"kimi-k3","choices":[{"index":0,"delta":{"reasoning_content":"Thinking..."}}]}
...
data: {"id":"chatcmpl-...","object":"chat.completion.chunk","created":1788348397,"model":"kimi-k3","choices":[{"index":0,"delta":{"content":"There are only 10 types of people in the world: those who understand binary and those who don't."}}]}
data: {"id":"chatcmpl-...","object":"chat.completion.chunk","created":1788348397,"model":"kimi-k3","choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}
data: [DONE]
```

### 4. Reasoning effort control

Control reasoning effort via the `reasoning_effort` field (`"max"`, `"high"`, `"low"`, `"default"`):

```bash
curl -s http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kimi-k3",
    "reasoning_effort": "low",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'
```

### 5. Tool / function calling

```bash
curl -s http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kimi-k3",
    "messages": [
      {"role": "user", "content": "What is the weather in Seattle right now?"}
    ],
    "tools": [
      {
        "type": "function",
        "function": {
          "name": "get_weather",
          "description": "Get current weather for a given city",
          "parameters": {
            "type": "object",
            "properties": {
              "location": {"type": "string", "description": "City name"}
            },
            "required": ["location"]
          }
        }
      }
    ],
    "stream": false
  }'
```

Response emits standard OpenAI `tool_calls` with `finish_reason: "tool_calls"`:

```json
{
  "id": "chatcmpl-cbe006c5-1b5d-42d3-ab89-254c7f012061",
  "object": "chat.completion",
  "created": 1788348416,
  "model": "kimi-k3",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": null,
        "reasoning_content": "The user is asking about the weather in Seattle...",
        "tool_calls": [
          {
            "index": 0,
            "id": "call_de6cdf1a_0",
            "type": "function",
            "function": {
              "name": "get_weather",
              "arguments": "{\"location\":\"Seattle\"}"
            }
          }
        ]
      },
      "finish_reason": "tool_calls"
    }
  ]
}
```

### 6. Submitting tool results in follow-up turns

```bash
curl -s http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kimi-k3",
    "messages": [
      {"role": "user", "content": "What is the weather in Seattle right now?"},
      {
        "role": "assistant",
        "tool_calls": [
          {
            "id": "call_de6cdf1a_0",
            "type": "function",
            "function": {"name": "get_weather", "arguments": "{\"location\":\"Seattle\"}"}
          }
        ]
      },
      {
        "role": "tool",
        "tool_call_id": "call_de6cdf1a_0",
        "name": "get_weather",
        "content": "{\"temperature\": \"16C\", \"conditions\": \"Partly cloudy with gentle breeze\"}"
      }
    ]
  }'
```

## Python OpenAI client integration

```python
from openai import OpenAI

client = OpenAI(
  base_url="http://localhost:8080/v1",
  api_key="not-needed",
)

# Streaming with reasoning
response = client.chat.completions.create(
  model="kimi-k3",
  messages=[
    {"role": "user", "content": "Explain quantum superposition in 2 sentences."}
  ],
  stream=True,
  extra_body={"reasoning_effort": "max"},
)

for chunk in response:
  delta = chunk.choices[0].delta
  if hasattr(delta, "reasoning_content") and delta.reasoning_content:
    print(delta.reasoning_content, end="", flush=True)
  if delta.content:
    print(delta.content, end="", flush=True)
print()
```

## SOCKS5 proxy usage

Run the gateway through a SOCKS5 proxy (e.g. Tor or local tunnel):

```bash
# Using CLI flag
./bin/k3r053n3 -socks socks5://127.0.0.1:9050

# With authentication
./bin/k3r053n3 -socks socks5://user:pass@127.0.0.1:1080

# Using environment variable
export ALL_PROXY=socks5://127.0.0.1:1080
./bin/k3r053n3
```

## Testing

Run unit and integration tests:

```bash
make test
```

## Credits

Created by Luxferre in 2026, released into the public domain with no warranties.