Claude 3.5 Sonnet vs Llama 3.1 405B

Claude 3.5 Sonnet vs Llama 3.1 405B: Claude 3.5 Sonnet is cheaper for input-heavy usage ($3.00/M vs $3.50/M input tokens), while Claude 3.5 Sonnet is better for long-context tasks (200,000 tokens).

Direct answer: choose Claude 3.5 Sonnet for lower token spend and choose Claude 3.5 Sonnet when your workload needs longer context.

Compare input and output token pricing, context windows, and monthly cost estimates on one page so you can pick the cheaper model fast.

Anthropic

Claude 3.5 Sonnet

Meta (via Together AI)

Llama 3.1 405B

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Claude 3.5 Sonnet pricing page Llama 3.1 405B pricing page Anthropic provider overview Meta (via Together AI) provider overview

Cost Comparison (1000 input + 500 output tokens, 100 requests/day)

Claude 3.5 Sonnet

Per Request:$0.0105

Daily:$1.05

Monthly:$31.50

Yearly:$383.25

Llama 3.1 405B

Per Request:$0.005250

Daily:$0.525

Monthly:$15.75

Yearly:$191.625

Cost Differences

$0.005250

Per Request

$0.525

Daily

$15.75

Monthly

$191.625

Yearly

Llama 3.1 405B costs less than Claude 3.5 Sonnet

Quick Recommendation

Winner for direct API pricing: Llama 3.1 405B. At the default workload, Llama 3.1 405B saves about $15.75/month ($191.625/year) versus Claude 3.5 Sonnet.

Claude 3.5 Sonnet full pricing breakdown Llama 3.1 405B full pricing breakdown Anthropic API pricing details Meta (via Together AI) API pricing details Anthropic vs Meta (via Together AI) API pricing Codex Mini vs Claude Opus 4.7 Codex Mini vs Claude Opus 4.6

Feature Comparison

Feature	Claude 3.5 Sonnet	Llama 3.1 405B
Provider	Anthropic	Meta (via Together AI)
Input Price	$3.00/1M tokens	$3.50/1M tokens
Output Price	$15.00/1M tokens	$3.50/1M tokens
Context Window	200,000 tokens	128,000 tokens
Max Output	8,192 tokens	32,768 tokens
Category	balanced	flagship
Capabilities	textvisioncode	textcodereasoning
Release Date	10/22/2024	7/23/2024

Claude 3.5 Sonnet vs Llama 3.1 405B: Which Should You Choose?

Choosing between Claude 3.5 Sonnet and Llama 3.1 405B depends on your priorities: cost efficiency, context length, or raw capability. Llama 3.1 405B is the more affordable option at $3.50/1M input tokens. Meanwhile, Claude 3.5 Sonnet offers a significantly larger context window at 200,000 tokens vs 128,000 for Llama 3.1 405B.

These models come from different providers — Anthropic and Meta (via Together AI) — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to Meta (via Together AI)involves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.

These models target different tiers: Claude 3.5 Sonnet is a balanced model while Llama 3.1 405B is flagship. This means they're optimized for different workloads. Llama 3.1 405B targets more demanding workloads, while Claude 3.5 Sonnet provides a cost-effective option for everyday tasks.

Output costs matter too. Claude 3.5 Sonnet charges $15.00/1M output tokens vs $3.50 for Llama 3.1 405B. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Llama 3.1 405B has the edge here at $3.50/1M output tokens.

Multimodal capabilities: Claude 3.5 Sonnet supports vision (image inputs) while Llama 3.1 405B is text-only. If your application needs image understanding, this narrows your choice.

Best Use Cases

Choose Claude 3.5 Sonnet when:

• Budget is a primary concern
• You need a larger context window (200,000 tokens)
• You're already using Anthropic's API ecosystem

Choose Llama 3.1 405B when:

• You need longer outputs (up to 32,768 tokens)
• You're already using Meta (via Together AI)'s API ecosystem

Pros and Caveats at a Glance

Claude 3.5 Sonnet

• Input pricing: $3.00/M tokens
• Output pricing: $15.00/M tokens
• Context window: 200,000 tokens
• Max output: 8,192 tokens

Watch out for

• Higher output cost than Llama 3.1 405B

Llama 3.1 405B

• Input pricing: $3.50/M tokens
• Output pricing: $3.50/M tokens
• Context window: 128,000 tokens
• Max output: 32,768 tokens

Watch out for

• Higher input cost than Claude 3.5 Sonnet
• Smaller context window than Claude 3.5 Sonnet

Try Different Scenarios

Use the calculator below to see how costs change with different usage patterns

Claude 3.5 Sonnet (Anthropic)

Cost Calculator

Provider

Model

Input Tokens

Output Tokens

Requests/Day

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Llama 3.1 405B (Meta (via Together AI))

Cost Calculator

Provider

Model

Input Tokens

Output Tokens

Requests/Day

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Frequently Asked Questions

Which is cheaper, Claude 3.5 Sonnet or Llama 3.1 405B?▼

Llama 3.1 405B is cheaper for input tokens at $3.50 per million tokens vs $3.00 for Claude 3.5 Sonnet.

What is the context window difference between Claude 3.5 Sonnet and Llama 3.1 405B?▼

Claude 3.5 Sonnet supports 200,000 tokens while Llama 3.1 405B supports 128,000 tokens — a difference of 72,000 tokens in favor of Claude 3.5 Sonnet.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, Llama 3.1 405B is the lower-cost option, while Claude 3.5 Sonnet offers a larger context window (200,000 vs 128,000 tokens). Choose Llama 3.1 405B for budget sensitivity or Claude 3.5 Sonnet for longer context tasks.

Which model has better overall pricing for heavy usage?▼

At 100 requests/day with 1,000 input and 500 output tokens each, Claude 3.5 Sonnet costs about $31.50/month and Llama 3.1 405B costs about $15.75/month. Overall, Llama 3.1 405B has lower combined input + output rates ($3.50 in, $3.50 out) vs Claude 3.5 Sonnet.

Where can I compare Anthropic and Meta (via Together AI) API pricing beyond this model matchup?▼

See the Anthropic vs Meta (via Together AI) provider comparison page for lineup-level averages, then review each model page for exact per-token rates.