Skip to main content
Launching the open-source gateway

Llama 3.1 8B Instruct vs Phi-4

SpecLlama 3.1 8B InstructPhi-4
Respan Index6.9 (#161)9.0 (#160)
Blended price per 1M$0.025$0.088
Context window128K16K
Input / output per 1M$0.02 / $0.04$0.07 / $0.14
Max output-16K
Inputtexttext
Released2024-07-232024-12-12

Respan Index by category

Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.

CategoryLlama 3.1 8B InstructPhi-4
Coding0.0 Llama 3.1 8B Instruct0.8* Phi-4
Agents0.8 Llama 3.1 8B Instruct0.7 Phi-4
Reasoning13.8 Llama 3.1 8B Instruct17.1 Phi-4
Knowledge & language0.4 Llama 3.1 8B Instruct3.2 Phi-4
Human preference21.6 Llama 3.1 8B Instruct26.9 Phi-4

* Estimated: no published scores in that category. How the Respan Index works

Benchmarks both report

Phi-4 leads on 7 of the 9 benchmarks both report. Higher is better. Each score links to where it was published.

BenchmarkLlama 3.1 8B InstructPhi-4
GPQA Diamond27%56.1%
MATH Level 5 (Epoch AI)22.9%64.9%
OTIS Mock AIME 2024-2025 (Epoch AI)1.7%13.8%
LMArena Elo12111256
BALROG (BALROG)15.1%11.6%
HumanEval72.6%82.6%
IFEval80.4%63%
MMLU69.4%84.8%
MMLU-Pro48.3%70.4%

FAQ

Is Llama 3.1 8B Instruct better than Phi-4?

Phi-4 scores 9.0 on the Respan Index (#160), ahead of Llama 3.1 8B Instruct at 6.9 (#161). Phi-4 leads on 7 of the 9 benchmarks both report.

Which is cheaper, Llama 3.1 8B Instruct or Phi-4?

Llama 3.1 8B Instruct lists at $0.02 input and $0.04 output per 1M tokens; Phi-4 at $0.07 and $0.14. Llama 3.1 8B Instruct is 3.5x cheaper per token at list price.

Which has the larger context window?

Llama 3.1 8B Instruct accepts 128K tokens and Phi-4 16K tokens.

Compare other models

vs

Built for AI agents.
Break less.
Ship more.