GPT-4o Mini vs o3

Compare GPT-4o Mini and o3: 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 OpenAI models What is an LLM API? Python Quickstart What is inference?
Feature GPT-4o Mini o3
CategoryCompactReasoning
Parameters~70B~1T
Context Window128K200K
Input Price$0.015/1M tokens$0.10/1M tokens
Output Price$0.06/1M tokens$0.40/1M tokens
Latency~200ms~2000ms

Choose GPT-4o Mini when:

  • ✓ High-volume multimodal
  • ✓ Content filtering
  • ✓ Budget apps
Key Strengths:

Low cost multimodal, Vision capable, Fast

Choose o3 when:

  • ✓ Complex calculations
  • ✓ Multi-factor analysis
  • ✓ Research-grade work
Key Strengths:

Extended thinking, Complex logic, Mathematical reasoning

Verdict: GPT-4o Mini vs o3

For cost efficiency, GPT-4o Mini wins at $0.015/1M input tokens. For speed, o3 is faster at ~2000ms. GPT-4o Mini excels at High-volume multimodal while o3 is better for Complex calculations. 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-4o Mini costs $0.015/1M input tokens and $0.06/1M output tokens. o3 costs $0.10 input and $0.40 output. GPT-4o Mini is 6.7x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

GPT-4o Mini has a 128K context window with ~200ms latency. o3 offers 200K context at ~2000ms. o3 has the larger context window.

Best For

GPT-4o Mini (Compact) is optimized for: High-volume multimodal, Content filtering, Budget apps. o3 (Reasoning) works best for: Complex calculations, Multi-factor analysis, Research-grade work.

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

# Use o3
response_b = client.chat.completions.create(
    model="o3",
    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-4o Mini or o3?

GPT-4o Mini (Compact, ~70B) offers Low cost multimodal. o3 (Reasoning, ~1T) offers Extended thinking. Choose GPT-4o Mini for High-volume multimodal or o3 for Complex calculations.

How much does GPT-4o Mini cost vs o3?

GPT-4o Mini: $0.015/1M input, $0.06/1M output. o3: $0.10/1M input, $0.40/1M 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-4o Mini and o3 by changing the model parameter. No code changes needed.

Related Comparisons

GPT-4o Mini vs GPT-4.1 Nano GPT-4o Mini vs o3 Mini GPT-4o Mini vs o4-mini GPT-4o Mini vs Claude Haiku 3.5 GPT-4o Mini vs Gemma 3 12B GPT-4o Mini vs Gemma 3 4B

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