Llama 3.1 405B Instruct

Llama 3.1 405B Instruct is a previous Meta instruct snapshot, not the live Llama catalog lead. There is no separate Llama 4 page on this site.

Compare Llama 3.1 8B Instruct and Llama 3.1 70B Instruct if you wanted the leftover 3.1 twins, Llama 3.2 Vision if you wanted the leftover vision snapshot, and GPT-5.6 Sol if you wanted a current frontier chat model.

Key Features

• Previous 3.1 405B instruct: older copy treated Llama 3.1 as Meta's current class. Confirm llama.com before you hard-code it.
• Not the 2026 Llama lead: llama.com now leads with Llama 4.
• License is community, not MIT: Confirm the Llama community / Acceptable Use terms. Do not assume MIT commercial.
• No invented bench: Do not paste leftover closed-source parity as a 2026 census.

Use Cases

• People with a Llama 3.1 405B Instruct bookmark who need the catalog corrected.
• People who were about to call it Meta's current instruct default.

Limitation: We did not re-download the 3.1 405B card or invent a 2026 per-token price.

Pricing

First-party pages on 2026-08-18.

If a leftover blog still calls 3.1 405B Meta's latest instruct, treat llama.com as the correction.

Getting Started

1. Open llama.com before you hard-code Llama 3.1 405B Instruct.
2. Confirm Llama 4 if you wanted the live Meta catalog.
3. Confirm Llama 3.1 8B Instruct and Llama 3.1 70B Instruct if you wanted the leftover 3.1 twins.
4. Do not paste "latest Llama class" into a 2026 deck.

Frequently Asked Questions

Is Llama 3.1 405B still Meta's default?

No. llama.com now leads with Llama 4.

Same as Llama 4?

No. Llama 4 is the live llama.com headline. This slug is a leftover 3.1 instruct snapshot.

Is it fully open source MIT?

Confirm the Llama community license and Acceptable Use Policy. Do not assume MIT commercial.

Alternatives

• Llama 3.2 Vision: Another leftover Meta snapshot (llama.com now leads Llama 4).
• Qwen3.8-2.4T-A95B: Live Alibaba multimodal flagship if you wanted a current open-weight path.
• GPT-5.6 Sol: Live OpenAI frontier chat if you wandered here for a current model.

Tips

1. Call 3.1 405B Instruct a previous snapshot, not the current Llama default.
2. Point new Meta work at Llama 4.
3. Confirm the community license before you invent a commercial claim.

Conclusion

Llama 3.1 405B Instruct is a previous Meta instruct snapshot, not the 2026 Llama default. Start at llama.com, then decide whether Llama 4 already covers the path you need.