# The Multivac — Evaluation Report

**Evaluation ID:** EVAL-20260207-142741
**Date:** Mar 10, 2026
**Category:** code
**Question ID:** CODE-009

---

## Question

This Python application has a memory leak. Find it and explain the fix.

```python
import threading
import time
from functools import lru_cache

class EventProcessor:
    _instances = []
    
    def __init__(self, name):
        self.name = name
        self.callbacks = []
        self._lock = threading.Lock()
        EventProcessor._instances.append(self)
    
    def register_callback(self, func):
        self.callbacks.append(func)
    
    @lru_cache(maxsize=10000)
    def process(self, event_data):
        results = []
        for callback in self.callbacks:
            result = callback(event_data)
            results.append(result)
        return tuple(results)
    
    def __del__(self):
        print(f"Processor {self.name} deleted")

def create_processor_for_request(request_id):
    processor = EventProcessor(f"processor_{request_id}")
    processor.register_callback(lambda x: x.upper())
    processor.register_callback(lambda x: len(x))
    return processor

# Simulated request handling
def handle_request(request_id, data):
    processor = create_processor_for_request(request_id)
    return processor.process(data)

# This runs for hours...
for i in range(1000000):
    result = handle_request(i, f"event_data_{i}")
    time.sleep(0.001)
```

---

## Winner

**Grok Code Fast** (xAI)
- Winner Score: 9.45
- Matrix Average: 8.21
- Total Judgments: 90

---

## Rankings

| Rank | Model | Provider | Avg Score | Judgments |
|------|-------|----------|-----------|----------|
| 1 | Grok Code Fast | xAI | 9.45 | 8 |
| 2 | Grok 3 (Direct) | xAI | 9.44 | 8 |
| 3 | GPT-5.2-Codex | OpenAI | 9.42 | 8 |
| 4 | Claude Sonnet 4.5 | Anthropic | 9.07 | 8 |
| 5 | Gemini 3 Flash Preview | Google | 8.86 | 7 |
| 6 | Claude Opus 4.5 | Anthropic | 8.84 | 8 |
| 7 | DeepSeek V3.2 | DeepSeek | 8.79 | 7 |
| 8 | MiniMax M2 | MiniMax | 8.71 | 7 |
| 9 | GLM-4-7 | Zhipu | 5.75 | 6 |
| 10 | Gemini 3 Pro Preview | Google | 3.72 | 8 |

---

## 10×10 Judgment Matrix

Rows = Judge, Columns = Respondent. Self-judgments excluded (—).

| Judge ↓ / Resp → | Gemini 3 | Gemini 3 | GLM-4-7 | Grok Code Fast | Claude Opus | Claude Sonnet | MiniMax M2 | Grok 3 | DeepSeek V3.2 | GPT-5.2-Codex |
|---|---|---|---|---|---|---|---|---|---|---|
| Gemini 3 | — | 6.0 | 0.0 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.6 | 9.8 |
| Gemini 3 | 0.0 | — | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| GLM-4-7 | 0.0 | 0.0 | — | 9.6 | 8.8 | 9.3 | 0.0 | 9.2 | 0.0 | 9.6 |
| Grok Code Fast | 9.8 | 2.1 | 1.0 | — | 9.8 | 10.0 | 9.8 | 9.8 | 9.8 | 9.8 |
| Claude Opus | 8.2 | 1.3 | 0.7 | 9.3 | — | 8.8 | 6.0 | 9.6 | 7.8 | 9.0 |
| Claude Sonnet | 9.2 | 8.6 | 8.6 | 9.8 | 9.3 | — | 8.8 | 10.0 | 9.2 | 9.6 |
| MiniMax M2 | 8.8 | 1.6 | 8.6 | 9.8 | 7.8 | 9.2 | — | 9.6 | 9.8 | 8.4 |
| Grok 3 | 8.8 | 3.7 | 7.0 | 9.4 | 9.0 | 8.8 | 9.6 | — | 8.6 | 9.6 |
| DeepSeek V3.2 | 9.6 | 5.8 | 8.6 | 9.1 | 9.3 | 9.2 | 8.6 | 9.3 | — | 9.6 |
| GPT-5.2-Codex | 7.6 | 0.7 | 0.0 | 8.8 | 7.0 | 7.5 | 8.4 | 8.2 | 6.8 | — |

---

## Methodology

- **10×10 Blind Peer Matrix:** All models answer the same question, then all models judge all responses.
- **5 Criteria:** Correctness, completeness, clarity, depth, usefulness (each scored 1–10).
- **Self-judgments excluded:** Models do not judge their own responses.
- **Weighted Score:** Composite of all 5 criteria.

---

## Citation

The Multivac (2026). Blind Peer Evaluation: CODE-009. app.themultivac.com

## License

Open data. Free to use, share, and build upon. Please cite The Multivac when using this data.

Download raw JSON: https://app.themultivac.com/api/evaluations/EVAL-20260207-142741/results
Full dataset: https://app.themultivac.com/dashboard/export