# Llama 3.1 8B vs Mistral Medium 3.5 128B

> Side-by-side benchmark comparison for Llama 3.1 8B and Mistral Medium 3.5 128B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/llama-3-1-8b-vs-mistral-medium-3-5-128b
- Last updated: October 14, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Llama 3.1 8B and Mistral Medium 3.5 128B.

## Summary

- Llama 3.1 8B and Mistral Medium 3.5 128B do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Llama 3.1 8B | Mistral Medium 3.5 128B |
|----------|----------|----------|
| Creator | Meta | Mistral |
| Type | Open Weight | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 256K |
| Independent public score (not head-to-head) | null | 33.88 |
| Benchmarks Covered | 7 | 7 |
| Pricing (input/output) | N/A | $1.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Llama 3.1 8B public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 20.2 (Supported · #105/124)

| Benchmark | Llama 3.1 8B | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| τ³-bench results | Coming soon | 91.4% | Coming soon |
| Gert Labs | Coming soon | 39.10% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 39.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Llama 3.1 8B public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 22.7 (Estimated · #112/148)

| Benchmark | Llama 3.1 8B | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| HumanEval | 72.6% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 77.6% | Coming soon |
| SWE-bench (Vals) | Coming soon | 66.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Llama 3.1 8B public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 73.5 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Llama 3.1 8B public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 60.1 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Llama 3.1 8B public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 31.8 (Supported · #145/181)

| Benchmark | Llama 3.1 8B | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 73% | Coming soon | Coming soon |
| MMLU-Pro | 48.3% | Coming soon | Coming soon |
| GPQA | 30.4% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 34.8% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 75.3% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Llama 3.1 8B public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: Coming soon

| Benchmark | Llama 3.1 8B | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| MGSM | 68.9% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Llama 3.1 8B public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 84 (#50/128)

| Benchmark | Llama 3.1 8B | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 80.4% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Llama 3.1 8B public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: Coming soon

| Benchmark | Llama 3.1 8B | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| GSM8K | 84.5% | Coming soon | Coming soon |

## FAQ

### Can I compare Llama 3.1 8B and Mistral Medium 3.5 128B on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Llama 3.1 8B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-llama-3-1-8b)
- [Mistral Medium 3.5 128B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-mistral-medium-3-5-128b)
- [Llama 3.1 8B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-llama-3-1-8b)
- [Mistral Medium 3.5 128B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-mistral-medium-3-5-128b)

## Explore More

- [Llama 3.1 8B profile](/models/llama-3-1-8b)
- [Mistral Medium 3.5 128B profile](/models/mistral-medium-3-5-128b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)