--- title: Meta: Llama 3.1 405B Instruct | Text Generation | ModelsLab description: Build with Meta: Llama 3.1 405B Instruct API by Meta Llama. Text generation, chat, code, and reasoning. Pay-per-use. Free tier. url: https://modelslab.com/models/together_ai/meta-llama-llama-3.1-405b-instruct.md canonical: https://modelslab.com/models/together_ai/meta-llama-llama-3.1-405b-instruct.md type: product component: Playground/LLM/Index generated_at: 2026-05-05T21:41:29.311134Z --- Meta: Llama 3.1 405B Instruct --- [LLMs.txt](https://modelslab.com/models/open_router/meta-llama-llama-3.1-405b-instruct/llms.txt) [.md](https://modelslab.com/models/meta-llama/meta-llama-llama-3.1-405b-instruct.md) meta-llama-llama-3.1-405b-instruct meta-llama Closed Source Model $4.000000 / call Meta: Llama 3.1 405B Instruct --- Choose a prompt below to get started or type your own message Explain quantum computing in simple terms Write a Python function to sort a list Create a marketing email for a SaaS product Compare REST vs GraphQL APIs Send ### Meta: Llama 3.1 405B Instruct meta-llama meta-llama-llama-3.1-405b-instruct Copy model ID PricingInput $4.00 / 1M tokens Output $4.00 / 1M tokens API EndpointsOpenAI Compatible `https://modelslab.com/api/v7/llm/chat/completions`Endpoint Anthropic Compatible `https://modelslab.com/api/v7/llm/v1/messages`Messages `https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens `https://modelslab.com/api/v7/llm/v1/models`Models Use with Claude Code cURL Example ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses. 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[ML](https://modelslab.com/models/open_router/meta-llama-llama-4-maverick)[Open Router](https://modelslab.com/models/open_router) [Meta: Llama 4 Maverick Closed Source Model](https://modelslab.com/models/open_router/meta-llama-llama-4-maverick) About Meta: Llama 3.1 405B Instruct --- The highly anticipated 400B class of Llama3 is here! Clocking in at 128k context with impressive eval scores, the Meta AI team continues to push the frontier of open-source LLMs. Meta's latest class of model (Llama 3.1) launched with a variety of sizes & flavors. This 405B instruct-tuned version is optimized for high quality dialogue usecases. It has demonstrated strong performance compared to leading closed-source models including GPT-4o and Claude 3.5 Sonnet in evaluations. To read more abo ### Technical Specifications Model IDmeta-llama-llama-3.1-405b-instructCategoryLLM ModelsTaskText GenerationPrice$4.000000 per API callAddedFebruary 20, 2026 ### Key Features - Chat completion and multi-turn conversation API - Streaming response with token-by-token output - Function calling and tool use support - System prompts and role-based messaging - JSON mode and structured output ### Quick Start Integrate Meta: Llama 3.1 405B Instruct into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started. PythonJavaScriptcURLPHP ``` import requests import json url = "https://modelslab.com/api/v7/llm/chat/completions" headers = { "Content-Type": "application/json" } data = { "model_id": "meta-llama-llama-3.1-405b-instruct", "messages": [ { "role": "user", "content": "Hello!" } ], "max_tokens": 1000, "key": "YOUR_API_KEY" } try: response = requests.post(url, headers=headers, json=data) response.raise_for_status() # Raises an HTTPError for bad responses (4XX or 5XX) result = response.json() print("API Response:") print(json.dumps(result, indent=2)) except requests.exceptions.HTTPError as http_err: print(f"HTTP error occurred: {http_err} - {response.text}") except Exception as err: print(f"Other error occurred: {err}") ``` View the [full API documentation](https://modelslab.com/models/meta-llama/meta-llama-llama-3.1-405b-instruct/api) for SDKs, code examples in Python, JavaScript, and more. ### Pricing Meta: Llama 3.1 405B Instruct API costs $4.000000 per API call. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab.com/pricing) ### Use Cases - AI chatbots and virtual assistants - Code generation and developer tools - Content writing and copywriting automation - Data analysis, summarization, and extraction [Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from Meta Llama](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing) Meta: Llama 3.1 405B Instruct FAQ --- ### What is Meta: Llama 3.1 405B Instruct? The highly anticipated 400B class of Llama3 is here! Clocking in at 128k context with impressive eval scores, the Meta AI team continues to push the frontier of open-source LLMs. Meta's latest class of model (Llama 3.1) launched with a variety of sizes & flavors. This 405B instruct-tuned version is ### How do I use the Meta: Llama 3.1 405B Instruct API? You can integrate Meta: Llama 3.1 405B Instruct into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "meta-llama-llama-3.1-405b-instruct" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Meta: Llama 3.1 405B Instruct cost? Meta: Llama 3.1 405B Instruct costs $4.000000 per API call. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started. ### What is the Meta: Llama 3.1 405B Instruct model ID? The model ID for Meta: Llama 3.1 405B Instruct is "meta-llama-llama-3.1-405b-instruct". Use this ID in your API requests to specify this model. ### Does Meta: Llama 3.1 405B Instruct have a free tier? Yes, ModelsLab offers a free tier that lets you try Meta: Llama 3.1 405B Instruct and other AI models. Sign up to get free API credits and start building immediately. --- *This markdown version is optimized for AI agents and LLMs.* **Links:** - [Website](https://modelslab.com) - [API Documentation](https://docs.modelslab.com) - [Blog](https://modelslab.com/blog) --- *Generated by ModelsLab - 2026-05-06*