# The Multivac — Evaluation Report

**Evaluation ID:** EVAL-20260318-162216
**Date:** Mar 18, 2026
**Category:** code
**Question ID:** EVAL-20260318-162216

---

## Question

Your Node.js API is responding with 502 errors under load. Here's the relevant code and infrastructure:

- Express.js API behind an Nginx reverse proxy
- Connection pool to PostgreSQL (max 20 connections)
- Average response time: 50ms normally, 30s+ during incidents
- Error logs show: "connect ETIMEDOUT" and "too many clients already"
- The issue starts when traffic exceeds 200 req/s

```javascript
app.get('/api/users/:id', async (req, res) => {
  const client = await pool.connect();
  const result = await client.query('SELECT * FROM users WHERE id = $1', [req.params.id]);
  res.json(result.rows[0]);
});
```

What's wrong? Provide the fix and explain the connection pool exhaustion pattern.

---

## Winner

**GPT-5.4** (openrouter)
- Winner Score: 9.97
- Matrix Average: 9.51
- Total Judgments: 56

---

## Rankings

| Rank | Model | Provider | Avg Score | Judgments |
|------|-------|----------|-----------|----------|
| 1 | GPT-5.4 | openrouter | 9.97 | 7 |
| 2 | Claude Sonnet 4.6 | openrouter | 9.88 | 7 |
| 3 | MiniMax M2.5 | openrouter | 9.65 | 7 |
| 4 | MiniMax M1 | openrouter | 9.64 | 7 |
| 5 | MiniMax M2 | MiniMax | 9.51 | 7 |
| 6 | MiniMax M2.7 | openrouter | 9.26 | 7 |
| 7 | MiniMax-01 | openrouter | 9.11 | 7 |
| 8 | MiniMax M2.1 | openrouter | 9.04 | 7 |

---

## 10×10 Judgment Matrix

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

| Judge ↓ / Resp → | MiniMax M2.7 | MiniMax M2.5 | MiniMax M2.1 | MiniMax M2 | MiniMax M1 | MiniMax-01 | Claude Sonnet | GPT-5.4 |
|---|---|---|---|---|---|---|---|---|
| MiniMax M2.7 | — | 9.8 | 8.4 | 8.8 | 9.8 | 9.4 | 9.8 | 9.8 |
| MiniMax M2.5 | 10.0 | — | 9.4 | 9.8 | 10.0 | 9.4 | 10.0 | 10.0 |
| MiniMax M2.1 | 9.6 | 9.8 | — | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 |
| MiniMax M2 | 9.0 | 10.0 | 9.4 | — | 9.8 | 9.6 | 10.0 | 10.0 |
| MiniMax M1 | 9.4 | 9.8 | 9.4 | 10.0 | — | 8.7 | 10.0 | 10.0 |
| MiniMax-01 | 9.8 | 9.8 | 9.6 | 9.8 | 9.8 | — | 10.0 | 10.0 |
| Claude Sonnet | 9.0 | 9.3 | 8.6 | 9.2 | 9.6 | 8.3 | — | 10.0 |
| GPT-5.4 | 8.0 | 9.0 | 8.4 | 9.0 | 8.6 | 8.4 | 9.3 | — |

---

## 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: EVAL-20260318-162216. 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-20260318-162216/results
Full dataset: https://app.themultivac.com/dashboard/export