SpaceXSI releases Grok 4.7 for coding and agentic work at Grok 4.6 prices

On September 21, 2026, SpaceXSI (xAI) released Grok 4.7 on the xAI API as grok-4.7, with a 500k context window, Grok 4.6 prices and a Fast mode offered only in Cursor and Grok Build.

Archive entry: this covers an event from September 21, 2026, and we published it on November 8, 2026. The details come from sources dated at the time and may have changed since.

On September 21, 2026, SpaceXSI (xAI) released Grok 4.7, which became available on the xAI API as grok-4.7, as recorded in the xAI release notes. The model carried the same prices as Grok 4.6.

What Grok 4.7 offered

It had a 500k context window, accepted text and image input, produced text output and set no output limit.
Below 200k prompt tokens, the prices per million tokens were $2 for input, $0.50 for cached tokens and $6 for output; above 200k they were $4, $1 and $12.
Reasoning effort could be set to low, medium, high (the default) or xhigh, and the Responses API always returned reasoning.encrypted_content.
Tools included function calling, web search, X search and code execution, and the knowledge cutoff was May 2026.
The US regional endpoint https://us.api.x.ai/v1 served the model at a 10% premium.
The developer guide recommended setting prompt_cache_key.

What it means for people who build with AI

Developers in Cursor, Grok Build or on the xAI API could use Grok 4.7 for coding and agentic tasks at unchanged prices. It was the default model in Grok Build, was available in Cursor on all plans, and was also reachable through the OpenRouter, Vercel and Cloudflare gateways.

Grok 4.7 Fast and availability

Grok 4.7 Fast was the same model at 2x the standard rates (1.5x for long context). According to the Grok 4.7 developer guide, it was offered only in Cursor and Grok Build, billed through the plan, and was not on the public API or Grok Build's free tier. The guide also called Grok 4.7 SpaceXSI's frontier model for coding, agentic tasks and knowledge work.

Sources

Release Notes | SpaceXSI Docs (SpaceXSI (xAI), September 21, 2026, official)
Grok 4.7 Developer Guide | SpaceXSI Docs (SpaceXSI (xAI), October 10, 2026, official)

Written with AI assistance, strictly from the sources listed above. Before it went live, automated checks verified its dates, sources and every language edition.