Side-by-side technical and economic comparison between Meta / Together's Llama 3.1 405B — Together AI and DeepSeek's DeepSeek-V4.1-Reasoner.
• Llama 3.1 405B — Together AI: Classified as a Legacy Reference model (Deprecated on Together AI (Reference)).
| Metric | Llama 3.1 405B — Together AI | DeepSeek-V4.1-Reasoner | Advantage |
|---|---|---|---|
| Provider Organization | Meta / Together | DeepSeek | — |
| Standard Input / 1M | $3.50 | $0.50 | DeepSeek-V4.1-Reasoner (86% lower) |
| Cached Input / 1M | None | $0.01 | DeepSeek-V4.1-Reasoner lower |
| Output / 1M | $3.50 | $2.50 | DeepSeek-V4.1-Reasoner lower |
| Context Window | 128k | 256k | DeepSeek-V4.1-Reasoner (256k) |
| Max Generation Tokens | 4.1k | 384k | DeepSeek-V4.1-Reasoner |
| Tokenizer Family | Meta Llama 3 Tiktoken BPE (~128k vocabulary) | DeepSeek Byte-Level BPE (102k vocabulary) | — |
Opt for Llama 3.1 405B — Together AI when your engineering requirements prioritize Meta / Together's ecosystem, specific tokenizer efficiencies (Exact Llama 3 Tokenizer (±2%)), or when your expected prompt-to-completion ratios favor its $3.5/M input rate.
Opt for DeepSeek-V4.1-Reasoner when looking for DeepSeek's tooling integration, specific context window depth (256k tokens), or when output generation volume favors its $2.5/M rate.