Grok 4.1 Fast Pricing
xAI · Grok 4 · Retired
Grok 4.1 Fast costs $0.2 per million input tokens and $0.5 per million output tokens on the xAI API. Cached input reads are billed at $0.05 per million tokens. It supports a 2,000,000-token context window and up to 16,384 output tokens per request. The model supports image input, tool use, long context. Pricing verified September 22, 2026.
Grok 4.1 Fast API pricing
Grok 4.1 Fast API pricing is $0.2 per million input tokens and $0.5 per million output tokens, verified September 22, 2026.
- Input (per 1M tokens)
- $0.2
- Output (per 1M tokens)
- $0.5
- Cached input (per 1M tokens)
- $0.05
- Context window
- 2,000,000 tokens
- Max output
- 16,384 tokens
Capabilities
Grok 4.1 Fast supports image input, tool use, long context.
Price history
See full Grok 4.1 Fast price historyGrok 4.1 Fast API pricing has not changed since June 28, 2026.
Price-stable since June 28, 2026.
Frequently asked questions
Short answers to the most common questions about Grok 4.1 Fast pricing, limits, and capabilities.
Notes
2026-09-22 STATUS SET TO RETIRED. This row had been flagged as actively wrong in a user-facing way since 2026-09-07 and was still reading Live. Grok 4.1 Fast was deprecated 2026-05-15 and RETIRED 2026-08-15 per xAI's own migration page (docs.x.ai/developers/migration/may-15-retirement) and Oracle OCI's model documentation. Requests to the retired slug no longer run this model — they silently redirect to grok-4.3 and bill at grok-4.3 rates ($1.25/M input, $2.50/M output), i.e. 6.25x the input price and 5x the output price this row advertised. Price fields left at $0.20 / $0.50 deliberately: they are the historically accurate rates for this SKU. Status=Retired removes the row from the calculator, which is the correct fix. Rewriting the prices to grok-4.3's rates would misrepresent a dead SKU as a live one.