GPT-4.1 Mini vs Phi-3.5 Mini

Compare GPT-4.1 Mini and Phi-3.5 Mini: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.

Updated 2026-05-21 · By Abhishek Raj · Our methodology

All OpenAI models All Microsoft models What is an LLM API? Python Quickstart What is inference?
Feature GPT-4.1 Mini Phi-3.5 Mini
CategoryFrontierCompact
Parameters~200B3.8B
Context Window1M128K
Input Price$0.03/1M tokens$0.005/1M tokens
Output Price$0.08/1M tokens$0.01/1M tokens
Latency~250ms~50ms

Choose GPT-4.1 Mini when:

  • ✓ High-volume horoscopes
  • ✓ Batch analysis
  • ✓ Content at scale
Key Strengths:

70% cheaper than GPT-4.1, 1M context, Strong reasoning

Choose Phi-3.5 Mini when:

  • ✓ Simple Q&A
  • ✓ Classification
  • ✓ Edge inference
Key Strengths:

128K context in tiny model, Ultra-low cost, Fast

Verdict: GPT-4.1 Mini vs Phi-3.5 Mini

For cost efficiency, Phi-3.5 Mini wins at $0.005/1M input tokens. For speed, GPT-4.1 Mini is faster at ~250ms. GPT-4.1 Mini excels at High-volume horoscopes while Phi-3.5 Mini is better for Simple Q&A. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.

Detailed Analysis

Pricing Comparison

GPT-4.1 Mini costs $0.03/1M input tokens and $0.08/1M output tokens. Phi-3.5 Mini costs $0.005 input and $0.01 output. Phi-3.5 Mini is 6.0x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

GPT-4.1 Mini has a 1M context window with ~250ms latency. Phi-3.5 Mini offers 128K context at ~50ms. GPT-4.1 Mini has the larger context window.

Best For

GPT-4.1 Mini (Frontier) is optimized for: High-volume horoscopes, Batch analysis, Content at scale. Phi-3.5 Mini (Compact) works best for: Simple Q&A, Classification, Edge inference.

Try Both on XALEN

Both models are available through XALEN's OpenAI-compatible API. Switch between them by changing the model parameter:

from xalen import XALEN

client = XALEN(api_key="xln_test_YOUR_KEY")

# Use GPT-4.1 Mini
response_a = client.chat.completions.create(
    model="gpt-4-1-mini",
    messages=[{"role": "user", "content": "Your question here"}]
)

# Use Phi-3.5 Mini
response_b = client.chat.completions.create(
    model="phi-3-5-mini",
    messages=[{"role": "user", "content": "Your question here"}]
)

Start Building with XALEN

200+ AI models. One API. Pay-as-you-go.

Get API Key Try in Playground

Frequently Asked Questions

Which is better, GPT-4.1 Mini or Phi-3.5 Mini?

GPT-4.1 Mini (Frontier, ~200B) offers 70% cheaper than GPT-4.1. Phi-3.5 Mini (Compact, 3.8B) offers 128K context in tiny model. Choose GPT-4.1 Mini for High-volume horoscopes or Phi-3.5 Mini for Simple Q&A.

How much does GPT-4.1 Mini cost vs Phi-3.5 Mini?

GPT-4.1 Mini: $0.03/1M input, $0.08/1M output. Phi-3.5 Mini: $0.005/1M input, $0.01/1M output. Both available on XALEN with batch processing at 50% discount.

Can I use both models on XALEN?

Yes. XALEN provides 200+ models through a single OpenAI-compatible API. Switch between GPT-4.1 Mini and Phi-3.5 Mini by changing the model parameter. No code changes needed.

Related Comparisons

GPT-4.1 Mini vs GPT-4.1 GPT-4.1 Mini vs GPT-4.1 Nano GPT-4.1 Mini vs GPT-4o GPT-4.1 Mini vs GPT-4o Mini GPT-4.1 Mini vs Claude Opus 4 GPT-4.1 Mini vs Claude Sonnet 4

Last updated: 2026-05-21. Pricing and specifications may change. Check pricing page for latest rates.