Side-by-side technical and economic comparison between xAI's Grok 2 and Meta / Together's Llama 4 Vivas.
• Grok 2: Classified as a Legacy Reference model (Generally Available).
| Metric | Grok 2 | Llama 4 Vivas | Advantage |
|---|---|---|---|
| Provider Organization | xAI | Meta / Together | — |
| Standard Input / 1M | $2.00 | $0.25 | Llama 4 Vivas (88% lower) |
| Cached Input / 1M | None | $0.06 | Llama 4 Vivas lower |
| Output / 1M | $10.00 | $0.85 | Llama 4 Vivas lower |
| Context Window | 128k | 1M | Llama 4 Vivas (1M) |
| Max Generation Tokens | 8.2k | 128k | Llama 4 Vivas |
| Tokenizer Family | xAI Byte-level BPE (~131k vocabulary) | Meta Llama 3 Tokenizer (128k vocabulary) | — |
Opt for Grok 2 when your engineering requirements prioritize xAI's ecosystem, specific tokenizer efficiencies (Calibrated xAI Tokenizer (±3%)), or when your expected prompt-to-completion ratios favor its $2/M input rate.
Opt for Llama 4 Vivas when looking for Meta / Together's tooling integration, specific context window depth (1M tokens), or when output generation volume favors its $0.85/M rate.