# The Multivac — Evaluation Report

**Evaluation ID:** EVAL-20260402-183311
**Date:** Apr 02, 2026
**Category:** reasoning
**Question ID:** REASON-030

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## Question

You believe X. Why? Because of Y. Why believe Y? Because of Z. This goes on forever (infinite regress). Three philosophical positions attempt to solve this: (1) Foundationalism — some beliefs need no justification. (2) Coherentism — beliefs justify each other in a web. (3) Infinitism — the chain can be infinite. Evaluate each. Then: how does an AI language model 'justify' its outputs? Does it face the same problem?

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## Winner

**GPT-5.4** (openrouter)
- Winner Score: 9.22
- Matrix Average: 8.54
- Total Judgments: 88

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## Rankings

| Rank | Model | Provider | Avg Score | Judgments |
|------|-------|----------|-----------|----------|
| 1 | GPT-5.4 | openrouter | 9.22 | 9 |
| 2 | Grok 4.20 | openrouter | 9.17 | 8 |
| 3 | MiMo-V2-Flash | Xiaomi | 9.13 | 9 |
| 4 | MiniMax M2.5 | openrouter | 8.91 | 9 |
| 5 | DeepSeek V4 | openrouter | 8.43 | 9 |
| 6 | Claude Opus 4.6 | openrouter | 8.43 | 9 |
| 7 | Gemini 2.5 Flash | openrouter | 8.39 | 8 |
| 8 | Claude Sonnet 4.6 | openrouter | 8.32 | 9 |
| 9 | GPT-OSS-120B | OpenAI | 7.70 | 9 |
| 10 | Gemini 3.1 Pro | openrouter | 7.68 | 9 |

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## 10×10 Judgment Matrix

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

| Judge ↓ / Resp → | GPT-OSS-120B | Gemini 3.1 Pro | DeepSeek V4 | Claude Opus | GPT-5.4 | Grok 4.20 | Claude Sonnet | MiMo-V2-Flash | Gemini 2.5 | MiniMax M2.5 |
|---|---|---|---|---|---|---|---|---|---|---|
| GPT-OSS-120B | — | 8.1 | 8.3 | 8.7 | 8.7 | · | 8.7 | 8.7 | 8.4 | 8.4 |
| Gemini 3.1 Pro | 6.0 | — | 9.0 | 8.0 | 10.0 | 10.0 | 8.0 | 10.0 | 7.9 | 9.7 |
| DeepSeek V4 | 9.3 | 8.4 | — | 8.8 | 8.8 | 8.8 | 8.8 | 9.3 | 9.3 | 9.3 |
| Claude Opus | 7.2 | 7.3 | 7.8 | — | 9.4 | 9.6 | 8.8 | 9.1 | 8.4 | 8.6 |
| GPT-5.4 | 5.9 | 5.9 | 8.8 | 7.7 | — | 9.2 | 7.3 | 9.0 | 8.2 | 9.0 |
| Grok 4.20 | 8.3 | 7.9 | 8.7 | 8.7 | 9.1 | — | 8.5 | 8.7 | 8.4 | 8.4 |
| Claude Sonnet | 8.3 | 7.8 | 7.8 | 8.7 | 9.2 | 9.2 | — | 8.7 | 8.4 | 8.7 |
| MiMo-V2-Flash | 9.1 | 8.4 | 8.4 | 8.8 | 9.2 | 9.2 | 8.7 | — | · | 9.2 |
| Gemini 2.5 | 8.8 | 8.8 | 8.8 | 8.8 | 10.0 | 8.8 | 8.7 | 9.8 | — | 8.8 |
| MiniMax M2.5 | 6.4 | 6.3 | 8.3 | 7.7 | 8.7 | 8.4 | 7.5 | 9.0 | 8.0 | — |

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## 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.

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## Citation

The Multivac (2026). Blind Peer Evaluation: REASON-030. 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-20260402-183311/results
Full dataset: https://app.themultivac.com/dashboard/export