Llama 3.1 405B Instruct
Meta's Llama 3.1 405B Instruct was the largest open-weights model ever released at launch (July 2024) and remains the benchmark for "what's possible with open weights." At 405 billion dense parameters and a 131K context window, it competes with frontier closed models on most evaluations — but at 5-10x the per-token cost of a 70B model on most providers. Realistic hosted pricing in 2026 ranges from $2.70/$2.70 per 1M tokens on the cheapest providers up to $3.50/$3.50 on Together. Worth running for high-stakes tasks where output quality justifies the price gap: complex agents, long-context analysis, or critical content generation. For most chat and RAG workloads, Llama 3.3 70B delivers 90% of the quality at 10% of the cost.
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Questions developers ask
How much does it cost to run Llama 3.1 405B Instruct for 100M tokens?▾
Running Llama 3.1 405B Instruct with 100M input and 10M output tokens per month costs approximately $350.00 on DeepInfra, the cheapest available provider as of the latest pricing data. Costs vary significantly depending on your input/output ratio and whether you use prompt caching.
What is the cheapest provider for Llama 3.1 405B Instruct?▾
DeepInfra currently offers Llama 3.1 405B Instruct at the lowest total cost for a standard workload. Prices change frequently — check the provider table above for the latest data.
What context window does Llama 3.1 405B Instruct support?▾
Llama 3.1 405B Instruct supports a context window of 131,072 tokens. Individual providers may cap this lower.
What's the cheapest way to run Llama 3.1 405B Instruct?▾
The cheapest way to run Llama 3.1 405B Instruct is via DeepInfra, starting at $2.70 per million input tokens. If your workload is prompt-heavy, enabling prompt caching can reduce costs further.
Is there a free tier for Llama 3.1 405B Instruct?▾
Free tiers vary by provider and change frequently. Check each provider's current pricing page for trial credits or free-tier limits. The prices shown on this page reflect paid API access.
How much does Llama 3.1 405B Instruct cost for 1M tokens?▾
Llama 3.1 405B Instruct input pricing starts at $2.70 per million tokens on DeepInfra. Output tokens are typically priced 2–4× higher than input tokens depending on the provider.
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Prices verified May 18, 2026 by scraping 5 providers. Methodology · Raw data