What is the context window of Meta: Llama 3.1 8B Instruct?

Meta: Llama 3.1 8B Instruct supports a context window of 131K tokens.

Is Meta: Llama 3.1 8B Instruct free to use?

Meta: Llama 3.1 8B Instruct is a paid model. It costs $0.050 per million input tokens and $0.080 per million output tokens.

How is LLM API pricing calculated?

LLM pricing has two components: input tokens (everything you send) and output tokens (what the model generates). Total cost = (prompt tokens × input rate + output tokens × output rate) / 1,000,000 × number of requests.

Meta: Llama 3.1 8B Instruct API Pricing — $0.050 Input / $0.080 Output per 1M Tokens

Q: How much does Meta: Llama 3.1 8B Instruct cost?

Meta: Llama 3.1 8B Instruct costs $0.050 per million input tokens and $0.080 per million output tokens via OpenRouter. Pricing was last updated Oct 29, 2026.

Meta: Llama 3.1 8B Instruct by Meta — $0.050 input / $0.080 output per 1M tokens via OpenRouter. Context: 131K tokens. Pricing last updated Oct 29, 2026.

Input / 1M tokens

$0.050

Output / 1M tokens

$0.080

Provider

Cost at common usage volumes

Usage	Daily	Monthly
Chatbot (100/day)	$0.013	$0.38
Small app (1K/day)	$0.090	$2.70
Mid-scale (10K/day)	$1.40	$42.00
Large scale (100K/day)	$33.00	$990.00

Model ID: meta-llama/llama-3.1-8b-instruct
Data source: OpenRouter public API — updated Oct 29, 2026.

← Full cost calculator Compare models →

About Meta: Llama 3.1 8B Instruct

Meta: Llama 3.1 8B Instruct is an LLM developed by Meta. Input costs $0.050 per million tokens and output costs $0.080 per million tokens via OpenRouter. It supports a context window of 131K tokens.

Pricing Details

Via the OpenRouter API:

Input tokens: $0.050 per 1 million tokens
Output tokens: $0.080 per 1 million tokens

A token is roughly 0.75 words. For context: a typical user message of 100 words is approximately 133 tokens; a 500-word system prompt is about 650 tokens.

How Much Does Meta: Llama 3.1 8B Instruct Cost?

For a typical chatbot application (1,000 requests/day, 1,000 prompt tokens and 500 output tokens per request):

Daily cost: $0.0900
Monthly cost: $2.700

Accessing Meta: Llama 3.1 8B Instruct via OpenRouter

OpenRouter provides a unified API for 200+ LLMs including Meta: Llama 3.1 8B Instruct. You can use it with any OpenAI-compatible SDK by setting the base URL to https://openrouter.ai/api/v1 and using your OpenRouter API key. The model ID is meta-llama/llama-3.1-8b-instruct.

Compare Meta: Llama 3.1 8B Instruct with Other Models

Use the AI Model Cost Comparison tool to compare Meta: Llama 3.1 8B Instruct against GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, or any other model side by side. Or use the LLM API Cost Calculator to browse all 456+ models sorted by cost for your specific usage.

Frequently Asked Questions

Yes. Meta: Llama 3.1 8B Instruct is available on OpenRouter with the model ID meta-llama/llama-3.1-8b-instruct. OpenRouter provides a unified API compatible with OpenAI's SDK format.