Model comparison
Grok Build 0.1 vs Qwen3.5 0.8B
Grok Build 0.1 (xAI) and Qwen3.5 0.8B (Qwen) 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 | Qwen3.5 0.8B | |
|---|---|---|
| Input price per 1M | $1.00 | $0.010 |
| Output price per 1M | $2.00 | $0.050 |
| Context window | 256K tokens | 33K tokens |
| Max output | 256K tokens | 8K tokens |
| Input types | text, image, pdf | text |
| Capabilities | tools, JSON, vision, reasoning | tools |
| Author | xAI | Qwen |
What a month costs on each
| Workload | Grok Build 0.1 | Qwen3.5 0.8B |
|---|---|---|
| Chatbot month (15M in, 4M out) | $23.00 | $0.350 |
| RAG month (40M in, 3M out) | $46.00 | $0.550 |
| Coding month (60M in, 10M out) | $80.00 | $1.10 |
On a typical 75/25 input-output mix, Qwen3.5 0.8B 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": "qwen/qwen3.5-0.8b", ...}'Common questions
Which is cheaper, Grok Build 0.1 or Qwen3.5 0.8B?
Qwen3.5 0.8B 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. Qwen3.5 0.8B offers 33K tokens.
Can I switch between Grok Build 0.1 and Qwen3.5 0.8B 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 qwen/qwen3.5-0.8b).
How do I pay for Grok Build 0.1 or Qwen3.5 0.8B?
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 Qwen: Qwen API pricing