Question 1

What does this Llama 3.1 405B vs Llama-3.3-70B-Instruct comparison cover?

Accepted Answer

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

Question 2

Which is cheaper: Llama 3.1 405B or Llama-3.3-70B-Instruct?

Accepted Answer

The available pricing does not establish a comparable input and output token rate for both models. Check the billing unit and selected host in each profile. Images, speech, video and local inference can have different cost structures.

Question 3

Which has the larger context window: Llama 3.1 405B or Llama-3.3-70B-Instruct?

Accepted Answer

Both records list a 128K-token context window. An equal limit does not imply equal recall, instruction following, or long-context quality.

Question 4

Which is faster: Llama 3.1 405B or Llama-3.3-70B-Instruct?

Accepted Answer

There is no matched speed measurement for both models with the same source, host, region and date. Test the same prompts at your expected concurrency and measure time to the first useful response as well as complete task time.

Question 5

What input and output types do Llama 3.1 405B and Llama-3.3-70B-Instruct support?

Accepted Answer

Llama 3.1 405B records text input and text output. Llama-3.3-70B-Instruct records text input and text output. “Not documented” means the current source record is incomplete; it does not prove that a modality is unsupported.

Question 6

Should I choose Llama 3.1 405B or Llama-3.3-70B-Instruct?

Accepted Answer

The recorded figures alone do not establish a clear choice. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Specification	Llama 3.1 405B	Llama-3.3-70B-Instruct
Provider	Meta	Meta
Listed pricing route	Meta	Meta
Model family	Llama 3.1	llama
Accepted inputs	text	text
Produced outputs	text	text
Context window	128K	128K
Max output	4.1K	4.1K
Input price / 1M	$3.50	$1.254
Output price / 1M	$3.50	$1.254
Output speed	30 t/s	—
Time to first token	0.70s	—
Reasoning mode	Not documented	Not documented
Tool calling	Documented	Documented
Image input	Not documented	Not documented
Audio input	Not documented	Not documented
Structured output	Documented	Not documented
License	Llama 3.1 Community	Open weights

Llama 3.1 405B vs Llama-3.3-70B-Instruct

Llama 3.1 405B

Llama-3.3-70B-Instruct

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

Compare a different pair