# GPT-4.5 vs Llama 3.1 8B

> Side-by-side benchmark comparison for GPT-4.5 and Llama 3.1 8B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-4-5-vs-llama-3-1-8b
- Last updated: October 14, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick GPT-4.5 if you want the stronger benchmark profile. Llama 3.1 8B only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-4.5 leads overall 69 to 51.
- The biggest single benchmark swing is GPQA in Knowledge, with scores of 69.5% and 30.4%.

## Model Snapshot

| Property | GPT-4.5 | Llama 3.1 8B |
|----------|----------|----------|
| Creator | OpenAI | Meta |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 128K | 128K |
| Overall Score | null | null |
| Benchmarks Covered | 6 | 7 |
| Pricing (input/output) | $75.00 / $150.00 | N/A |

## Category Breakdown

### Coding

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Llama 3.1 8B public-lane score: Coming soon

| Benchmark | GPT-4.5 | Llama 3.1 8B | Winner |
|-----------|-----------|-----------|--------|
| HumanEval | 88.6% | 72.6% | GPT-4.5 |

### Reasoning

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Llama 3.1 8B public-lane score: Coming soon

| Benchmark | GPT-4.5 | Llama 3.1 8B | Winner |
|-----------|-----------|-----------|--------|
| DROP | 83.4% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Llama 3.1 8B public-lane score: Coming soon

| Benchmark | GPT-4.5 | Llama 3.1 8B | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 90.8% | 73% | GPT-4.5 |
| GPQA | 69.5% | 30.4% | GPT-4.5 |
| SimpleQA | 62.5% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 48.3% | Coming soon |

### Multilingual

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Llama 3.1 8B public-lane score: Coming soon

| Benchmark | GPT-4.5 | Llama 3.1 8B | Winner |
|-----------|-----------|-----------|--------|
| MGSM | 86.9% | 68.9% | GPT-4.5 |

### Instruction Following

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Llama 3.1 8B public-lane score: Coming soon

| Benchmark | GPT-4.5 | Llama 3.1 8B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 80.4% | Coming soon |

### Mathematics

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Llama 3.1 8B public-lane score: Coming soon

| Benchmark | GPT-4.5 | Llama 3.1 8B | Winner |
|-----------|-----------|-----------|--------|
| GSM8K | Coming soon | 84.5% | Coming soon |

## FAQ

### Which is better overall, GPT-4.5 or Llama 3.1 8B?

GPT-4.5 is ahead overall on BenchLM right now.

### How many benchmarks does GPT-4.5 cover on BenchLM?

GPT-4.5 currently has 6 sourced benchmark scores on BenchLM.

### How many benchmarks does Llama 3.1 8B cover on BenchLM?

Llama 3.1 8B currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-4-5)
- [Llama 3.1 8B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-llama-3-1-8b)
- [GPT-4.5 vs GPT-6.1 Sol](/compare/gpt-4-5-vs-gpt-6-1-sol)
- [Llama 3.1 8B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-llama-3-1-8b)

## Explore More

- [GPT-4.5 profile](/models/gpt-4-5)
- [Llama 3.1 8B profile](/models/llama-3-1-8b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)