# Gemini 3.5 Flash vs Meta Llama 3.1 405B Instruct

On provider list prices, Meta Llama 3.1 405B Instruct costs $3.50 per million input tokens against $1.50 for Gemini 3.5 Flash: effectively level. Output is $3.50 against $9 (2.6x). On Allocate both bill at list plus the 7% transaction fee.

## Specifications

| | Gemini 3.5 Flash | Meta Llama 3.1 405B Instruct |
| --- | --- | --- |
| Lab | Google | Meta |
| Access | API only | Open weights |
| Context window | 1M tokens | 4K tokens |
| List price, input | $1.50 / M tokens | $3.50 / M tokens |
| List price, output | $9 / M tokens | $3.50 / M tokens |
| Cached input | n/a | n/a |
| License | Proprietary API | Llama community |
| Fine-tunable | No | Yes |

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 $4,950 a month on Gemini 3.5 Flash and $5,425 on Meta Llama 3.1 405B Instruct at list: a gap of $475.

Gemini 3.5 Flash 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 Gemini 3.5 Flash for

- High-volume support and triage
- Document extraction at scale
- Vision and OCR pipelines

## Choose Meta Llama 3.1 405B Instruct for

- Open weights you can fine-tune and own

## Common questions

### Which is cheaper, Gemini 3.5 Flash or Meta Llama 3.1 405B Instruct?

Gemini 3.5 Flash, on this workload shape. At list prices it is $1.50/$9 per million tokens in and out against $3.50/$3.50 for Meta Llama 3.1 405B Instruct. Billed on Allocate: $1.60/$9.63 against $3.75/$3.75, list plus 7%.

### Which has the bigger context window?

Gemini 3.5 Flash: 1,000,000 tokens (1M) against 4,096 (4K) for Meta Llama 3.1 405B Instruct.

### Can I fine-tune Gemini 3.5 Flash or Meta Llama 3.1 405B Instruct?

Meta Llama 3.1 405B Instruct publishes open weights (Llama community) and can be fine-tuned on your own data. Gemini 3.5 Flash is a closed model served over API; its weights are not available.

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[HTML page](https://allocate.network/compare/gemini-3-5-flash-vs-meta-llama-3-1-405b-instruct) · [Gemini 3.5 Flash](https://allocate.network/models/gemini-3-5-flash.md) · [Meta Llama 3.1 405B Instruct](https://allocate.network/models/meta-llama-3-1-405b-instruct.md) · [Machine-readable catalog](https://allocate.network/catalog.json)