Mars5 TTS vs Aya Expanse 32B

Compare Mars5 TTS and Aya Expanse 32B: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.

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

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Feature Mars5 TTS Aya Expanse 32B
CategorySpeechOpen Source
ParametersGenerative32B
Context WindowN/A128K
Input Price$0.012/1K/1M tokens$0.03/1M tokens
Output PriceN/A/1M tokens$0.06/1M tokens
Latency~250ms~250ms

Choose Mars5 TTS when:

  • ✓ Custom voices
  • ✓ Audiobooks
  • ✓ Character voices
Key Strengths:

Voice cloning, Emotion control, Natural output

Choose Aya Expanse 32B when:

  • ✓ Multilingual apps
  • ✓ Translation
  • ✓ Global content
Key Strengths:

23 languages, Open weights, Strong multilingual

Verdict: Mars5 TTS vs Aya Expanse 32B

For cost efficiency, Mars5 TTS wins at $0.012/1K/1M input tokens. For speed, Aya Expanse 32B is faster at ~250ms. Mars5 TTS excels at Custom voices while Aya Expanse 32B is better for Multilingual apps. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.

Detailed Analysis

Pricing Comparison

Mars5 TTS costs $0.012/1K/1M input tokens and N/A/1M output tokens. Aya Expanse 32B costs $0.03 input and $0.06 output. Mars5 TTS is 2.5x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

Mars5 TTS has a N/A context window with ~250ms latency. Aya Expanse 32B offers 128K context at ~250ms. Aya Expanse 32B has the larger context window.

Best For

Mars5 TTS (Speech) is optimized for: Custom voices, Audiobooks, Character voices. Aya Expanse 32B (Open Source) works best for: Multilingual apps, Translation, Global content.

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 Mars5 TTS
response_a = client.chat.completions.create(
    model="mars5-tts",
    messages=[{"role": "user", "content": "Your question here"}]
)

# Use Aya Expanse 32B
response_b = client.chat.completions.create(
    model="c4ai-aya-expanse-32b",
    messages=[{"role": "user", "content": "Your question here"}]
)

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Get API Key Try in Playground

Frequently Asked Questions

Which is better, Mars5 TTS or Aya Expanse 32B?

Mars5 TTS (Speech, Generative) offers Voice cloning. Aya Expanse 32B (Open Source, 32B) offers 23 languages. Choose Mars5 TTS for Custom voices or Aya Expanse 32B for Multilingual apps.

How much does Mars5 TTS cost vs Aya Expanse 32B?

Mars5 TTS: $0.012/1K/1M input, N/A/1M output. Aya Expanse 32B: $0.03/1M input, $0.06/1M 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 Mars5 TTS and Aya Expanse 32B by changing the model parameter. No code changes needed.

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