GPT-4o vs MythoMax 13B

Compare GPT-4o and MythoMax 13B: 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 Gryphe models What is an LLM API? Python Quickstart What is inference?
Feature GPT-4o MythoMax 13B
CategoryFrontierOpen Source
Parameters~1T13B
Context Window128K4K
Input Price$0.05/1M tokens$0.01/1M tokens
Output Price$0.15/1M tokens$0.02/1M tokens
Latency~400ms~100ms

Choose GPT-4o when:

  • ✓ Chart image analysis
  • ✓ Multimodal Q&A
  • ✓ Content generation
Key Strengths:

Multimodal, Fast for frontier, Strong reasoning

Choose MythoMax 13B when:

  • ✓ Story generation
  • ✓ Creative content
  • ✓ Interactive fiction
Key Strengths:

Creative writing, Roleplay, Narrative quality

Verdict: GPT-4o vs MythoMax 13B

For cost efficiency, MythoMax 13B wins at $0.01/1M input tokens. For speed, MythoMax 13B is faster at ~100ms. GPT-4o excels at Chart image analysis while MythoMax 13B is better for Story generation. 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 costs $0.05/1M input tokens and $0.15/1M output tokens. MythoMax 13B costs $0.01 input and $0.02 output. MythoMax 13B is 5.0x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

GPT-4o has a 128K context window with ~400ms latency. MythoMax 13B offers 4K context at ~100ms. GPT-4o has the larger context window.

Best For

GPT-4o (Frontier) is optimized for: Chart image analysis, Multimodal Q&A, Content generation. MythoMax 13B (Open Source) works best for: Story generation, Creative content, Interactive fiction.

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

# Use MythoMax 13B
response_b = client.chat.completions.create(
    model="mythomax-13b",
    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 or MythoMax 13B?

GPT-4o (Frontier, ~1T) offers Multimodal. MythoMax 13B (Open Source, 13B) offers Creative writing. Choose GPT-4o for Chart image analysis or MythoMax 13B for Story generation.

How much does GPT-4o cost vs MythoMax 13B?

GPT-4o: $0.05/1M input, $0.15/1M output. MythoMax 13B: $0.01/1M input, $0.02/1M 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 and MythoMax 13B by changing the model parameter. No code changes needed.

Related Comparisons

GPT-4o vs GPT-4.1 GPT-4o vs GPT-4.1 Mini GPT-4o vs Claude Opus 4 GPT-4o vs Claude Sonnet 4 GPT-4o vs Claude Opus 4.5 GPT-4o vs Claude Sonnet 4.5

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