Llama 3.1 405B vs XTTS v2

Compare Llama 3.1 405B and XTTS v2: 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 Llama 3.1 405B XTTS v2
CategoryOpen SourceSpeech
Parameters405BGenerative
Context Window128KN/A
Input Price$0.08/1M tokens$0.015/1K/1M tokens
Output Price$0.14/1M tokensN/A/1M tokens
Latency~600ms~300ms

Choose Llama 3.1 405B when:

  • ✓ Premium tasks
  • ✓ Research
  • ✓ Fine-tuning base
Key Strengths:

Largest open model, Highest open-source quality

Choose XTTS v2 when:

  • ✓ Voice readings
  • ✓ Temple announcements
  • ✓ Guided meditation
Key Strengths:

Natural prosody, Multiple Indian voices, Voice cloning

Verdict: Llama 3.1 405B vs XTTS v2

For cost efficiency, XTTS v2 wins at $0.015/1K/1M input tokens. For speed, XTTS v2 is faster at ~300ms. Llama 3.1 405B excels at Premium tasks while XTTS v2 is better for Voice readings. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.

Detailed Analysis

Pricing Comparison

Llama 3.1 405B costs $0.08/1M input tokens and $0.14/1M output tokens. XTTS v2 costs $0.015/1K input and N/A output. XTTS v2 is 5.3x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

Llama 3.1 405B has a 128K context window with ~600ms latency. XTTS v2 offers N/A context at ~300ms. Llama 3.1 405B has the larger context window.

Best For

Llama 3.1 405B (Open Source) is optimized for: Premium tasks, Research, Fine-tuning base. XTTS v2 (Speech) works best for: Voice readings, Temple announcements, Guided meditation.

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 Llama 3.1 405B
response_a = client.chat.completions.create(
    model="llama-3-1-405b",
    messages=[{"role": "user", "content": "Your question here"}]
)

# Use XTTS v2
response_b = client.chat.completions.create(
    model="xtts-v2",
    messages=[{"role": "user", "content": "Your question here"}]
)

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Get API Key Try in Playground

Frequently Asked Questions

Which is better, Llama 3.1 405B or XTTS v2?

Llama 3.1 405B (Open Source, 405B) offers Largest open model. XTTS v2 (Speech, Generative) offers Natural prosody. Choose Llama 3.1 405B for Premium tasks or XTTS v2 for Voice readings.

How much does Llama 3.1 405B cost vs XTTS v2?

Llama 3.1 405B: $0.08/1M input, $0.14/1M output. XTTS v2: $0.015/1K/1M input, N/A/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 Llama 3.1 405B and XTTS v2 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.