Llama 3.1 405B vs Perspective API

Compare Llama 3.1 405B and Perspective API: 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 Meta models All Google models What is an LLM API? Python Quickstart What is inference?
Feature Llama 3.1 405B Perspective API
CategoryOpen SourceSafety
Parameters405B~500M
Context Window128K3K
Input Price$0.08/1M tokensFree/1M tokens
Output Price$0.14/1M tokensN/A/1M tokens
Latency~600ms~80ms

Choose Llama 3.1 405B when:

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

Largest open model, Highest open-source quality

Choose Perspective API when:

  • ✓ Comment moderation
  • ✓ Toxicity detection
  • ✓ Community safety
Key Strengths:

Free, Toxicity scoring, Multiple attributes

Verdict: Llama 3.1 405B vs Perspective API

For cost efficiency, Perspective API wins at Free/1M input tokens. For speed, Llama 3.1 405B is faster at ~600ms. Llama 3.1 405B excels at Premium tasks while Perspective API is better for Comment moderation. 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. Perspective API costs Free input and N/A output. Perspective API is NaNx 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. Perspective API offers 3K context at ~80ms. 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. Perspective API (Safety) works best for: Comment moderation, Toxicity detection, Community safety.

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 Perspective API
response_b = client.chat.completions.create(
    model="perspective-api",
    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, Llama 3.1 405B or Perspective API?

Llama 3.1 405B (Open Source, 405B) offers Largest open model. Perspective API (Safety, ~500M) offers Free. Choose Llama 3.1 405B for Premium tasks or Perspective API for Comment moderation.

How much does Llama 3.1 405B cost vs Perspective API?

Llama 3.1 405B: $0.08/1M input, $0.14/1M output. Perspective API: Free/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 Perspective API 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.