Grok 4.1 Fast (Reasoning) pricing & specs
xAI · released 2025-11-19 · ● verified 2026-10-11 · deprecated
This model is deprecated. Cheapest compatible replacement: Gemma 4 E2B IT.
input / 1M$0.20via Google Vertex AI
output / 1M$0.50via Google Vertex AI
context128K
max output30K
// price history ($/1M tokens)
// cheaper or similar alternatives
| model | in | out | ctx | vs Grok 4.1 Fast (Reasoning) |
|---|---|---|---|---|
| Gemma 4 E2B IT | $0.04 | $0.08 | 131.1K | −81.8% |
| Qwen3.7 Flash | $0.03 | $0.13 | 1M | −80% |
| Qwen3.5 9B | $0.10 | $0.15 | 262.1K | −59.1% |
| Gemma 4 26B A4B IT | $0.07 | $0.34 | 262.1K | −50% |
| GPT-5 Nano | $0.05 | $0.40 | 400K | −50% |
// price by host
| host | in $/1M | out $/1M |
|---|---|---|
| Google Vertex AI | $0.20 | $0.50 |
// faq
How much does Grok 4.1 Fast (Reasoning) cost?
Grok 4.1 Fast (Reasoning) costs $0.20 per million input tokens and $0.50 per million output tokens (cheapest tracked host: Google Vertex AI). At 50M input and 10M output tokens per month that is about $15.00.
What is the context window of Grok 4.1 Fast (Reasoning)?
128K tokens, with up to 30K output tokens per request.
Does Grok 4.1 Fast (Reasoning) support prompt caching?
Yes. Cached input tokens cost $0.05 per million.
What are cheaper alternatives to Grok 4.1 Fast (Reasoning)?
Gemma 4 E2B IT ($0.04 in / $0.08 out), Qwen3.7 Flash ($0.03 in / $0.13 out), Qwen3.5 9B ($0.10 in / $0.15 out) offer the same input types and capabilities for less.
// spec sheet
- input / 1M
- $0.20
- output / 1M
- $0.50
- cache read / 1M
- $0.05
- blended (3:1)
- $0.275
- context
- 128K
- max output
- 30K
- input types
- text · image
- reasoning
- yes
- tool calling
- yes
- structured output
- yes
- open weights
- no
- knowledge cutoff
- n/a
- price source
- Google Vertex AI
// cost calculator
| model | in $/1M | out $/1M | = monthly |
|---|---|---|---|
| Gemma 4 E2B IT | $0.04 | $0.08 | $2.80 |
| Qwen3.7 Flash | $0.03 | $0.13 | $2.80 |
| Qwen3.5 9B | $0.10 | $0.15 | $6.50 |
| Grok 4.1 Fast (Reasoning) | $0.20 | $0.50 | $15.00 |
Base-tier list prices. Long-context tiers, caching and batch discounts are not included.