Llama 3.1 70B vs Phi-3 Medium
Head-to-head specifications
| Metric | Llama 3.1 70B | Phi-3 Medium | Difference |
|---|---|---|---|
| MMLU (general capability) | 86.0% | 78.0% | +8.0% |
| Context window | 128K tokens | 128K tokens | — |
| Price (input / output per 1M) | Open weights | Open weights | — |
| Access | Open weights | Open weights | — |
- Llama 3.1 70B leads general capability (MMLU 86.0% vs 78.0%).
Verdict: Llama 3.1 70B or Phi-3 Medium?
Llama 3.1 70B advantages
- General capability (+9%)
Phi-3 Medium advantages
- No decisive advantage on the tracked metrics.
Which should you choose?
- Choose the Llama 3.1 70B if you need the strongest reasoning and accuracy.
Value for money
Both are open-weight models you can self-host, so running cost depends on your own infrastructure rather than API pricing.
Llama 3.1 70B vs Phi-3 Medium: which should you choose?
Llama 3.1 70B — Meta large language model (2024) with a 128K-token context window and an MMLU score of 86.0%, released with open weights.
Phi-3 Medium — Microsoft large language model (2024) with a 128K-token context window and an MMLU score of 78.0%, released with open weights.
Llama 3.1 70B vs Phi-3 Medium: Llama 3.1 70B scores higher on the MMLU benchmark. Llama 3.1 70B leads general capability (MMLU 86.0% vs 78.0%).
Capability and reasoning
On MMLU — a 57-subject benchmark of general knowledge and reasoning — the Llama 3.1 70B scores 86.0% versus 78.0%. MMLU is a useful proxy for raw knowledge but does not capture instruction-following, coding, tool use, latency or safety, so treat it as one signal among several.
Context window
The Llama 3.1 70B handles up to 128K tokens per request, which sets how much documentation, transcript or code it can reason over at once — decisive for retrieval-augmented and long-document workflows.
Pricing and access
Llama 3.1 70B is open weights and Phi-3 Medium is open weights. Proprietary models bill per token via API; open-weight models can be self-hosted, trading per-call cost for infrastructure you manage. For production, weigh throughput, rate limits and data-residency needs alongside headline price.
The verdict
Both are credible choices in the ai model comparison space; the specification table above lays out every metric so you can weigh the trade-offs that matter to you. Pick the one whose strengths line up with how you will actually use it.
Frequently asked questions
Is the Llama 3.1 70B better than the Phi-3 Medium?
Llama 3.1 70B is the clearly stronger overall choice, winning most of the dimensions that matter. Llama 3.1 70B leads general capability (MMLU 86.0% vs 78.0%).
What is the main difference between the Llama 3.1 70B and the Phi-3 Medium?
Llama 3.1 70B leads general capability (MMLU 86.0% vs 78.0%).
Which is better value?
Both are open-weight models you can self-host, so running cost depends on your own infrastructure rather than API pricing.
Which should I choose?
Choose the Llama 3.1 70B if you need the strongest reasoning and accuracy.
Methodology
Large language models are compared on the MMLU benchmark (a widely-cited 57-subject test of general knowledge and reasoning, reported as a percentage), maximum context window, and published API pricing per million input and output tokens. Open-weight models can also be self-hosted. Benchmarks capture only part of real-world quality, which also depends on tool use, latency, safety and task fit.