Model comparison
Grok Build 0.1 vs Llama-3.1-8B-Instruct
Grok Build 0.1 (xAI) and Llama-3.1-8B-Instruct (Meta) side by side: what each costs per million tokens through Rapid Router, how much context each takes, what each supports, and where independent benchmarks place them. Same API, same key; switching is a one-string change.
| Grok Build 0.1 | Llama-3.1-8B-Instruct | |
|---|---|---|
| Input price per 1M | $1.00 | $0.020 |
| Output price per 1M | $2.00 | $0.040 |
| Context window | 256K tokens | 131K tokens |
| Max output | 256K tokens | 118K tokens |
| Input types | text, image, pdf | text |
| Capabilities | tools, JSON, vision, reasoning | tools, JSON |
| Author | xAI | Meta |
What a month costs on each
| Workload | Grok Build 0.1 | Llama-3.1-8B-Instruct |
|---|---|---|
| Chatbot month (15M in, 4M out) | $23.00 | $0.460 |
| RAG month (40M in, 3M out) | $46.00 | $0.920 |
| Coding month (60M in, 10M out) | $80.00 | $1.60 |
On a typical 75/25 input-output mix, Llama-3.1-8B-Instruct costs less (about 98% less than Grok Build 0.1). Grok Build 0.1 takes the longer prompt at 256K tokens. Try your own numbers in the cost calculator.
Call either one
curl https://rapidrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $RAPIDROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "x-ai/grok-build-0.1", "messages": [{"role": "user", "content": "Hello"}]}'
# the other one: change the model string
-d '{"model": "meta-llama/meta-llama-3.1-8b-instruct:free", ...}'Common questions
Which is cheaper, Grok Build 0.1 or Llama-3.1-8B-Instruct?
Llama-3.1-8B-Instruct is cheaper on a typical mix of 75% input and 25% output tokens, by about 98%. Through Rapid Router both are billed at the provider list price per million tokens.
Which has the larger context window?
Grok Build 0.1, at 256K tokens. Llama-3.1-8B-Instruct offers 131K tokens.
Can I switch between Grok Build 0.1 and Llama-3.1-8B-Instruct without changing code?
Yes. Both are callable at https://rapidrouter.ai/api/v1 with the same OpenAI-compatible request; only the model string changes (x-ai/grok-build-0.1 or meta-llama/meta-llama-3.1-8b-instruct:free).
How do I pay for Grok Build 0.1 or Llama-3.1-8B-Instruct?
Top up a Rapid Router balance by card in US dollars, and both models debit that balance per request.
More Grok models: xAI API pricing · More Llama: Meta API pricing