# Meta Llama 3.1 405B Instruct vs Claude Sonnet 5

On provider list prices, Meta Llama 3.1 405B Instruct costs $3.50 per million input tokens against $3 for Claude Sonnet 5: effectively level. Output is $3.50 against $15 (4.3x). On Allocate both bill at list plus the 7% transaction fee.

## Specifications

| | Meta Llama 3.1 405B Instruct | Claude Sonnet 5 |
| --- | --- | --- |
| Lab | Meta | Anthropic |
| Access | Open weights | API only |
| Context window | 4K tokens | 1M tokens |
| List price, input | $3.50 / M tokens | $3 / M tokens |
| List price, output | $3.50 / M tokens | $15 / M tokens |
| Cached input | n/a | n/a |
| License | Llama community | Proprietary API |
| Fine-tunable | Yes | No |

Specifications and provider list prices from the Allocate catalog, checked 2026-07-08. Billed price is list plus the 7% transaction fee.

## What the numbers say

Take 1,000,000 requests a month at 1,200 input and 350 output tokens each. That workload costs $5,425 a month on Meta Llama 3.1 405B Instruct and $8,850 on Claude Sonnet 5 at list: a gap of $3,425, or 1.6x.

Claude Sonnet 5 reads 1M tokens per request against 4K for Meta Llama 3.1 405B Instruct, 244.1x the window. That decides which one can take whole documents without splitting them.

## Choose Meta Llama 3.1 405B Instruct for

- Open weights you can fine-tune and own

## Choose Claude Sonnet 5 for

- Judgment calls with policy context
- Customer-facing writing
- Review and escalation flows

## Common questions

### Which is cheaper, Meta Llama 3.1 405B Instruct or Claude Sonnet 5?

Meta Llama 3.1 405B Instruct, on this workload shape. At list prices it is $3.50/$3.50 per million tokens in and out against $3/$15 for Claude Sonnet 5. Billed on Allocate: $3.75/$3.75 against $3.21/$16.05, list plus 7%.

### Which has the bigger context window?

Claude Sonnet 5: 1,000,000 tokens (1M) against 4,096 (4K) for Meta Llama 3.1 405B Instruct.

### Can I fine-tune Meta Llama 3.1 405B Instruct or Claude Sonnet 5?

Meta Llama 3.1 405B Instruct publishes open weights (Llama community) and can be fine-tuned on your own data. Claude Sonnet 5 is a closed model served over API; its weights are not available.

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[HTML page](https://allocate.network/compare/meta-llama-3-1-405b-instruct-vs-sonnet-5) · [Meta Llama 3.1 405B Instruct](https://allocate.network/models/meta-llama-3-1-405b-instruct.md) · [Claude Sonnet 5](https://allocate.network/models/sonnet-5.md) · [Machine-readable catalog](https://allocate.network/catalog.json)