The table is the first thing worth looking at. Not for the numbers, but because the new model loses in it.
SpaceXAI puts Grok 4.7 next to Grok 4.6, GPT-5.6 Sol and Fable 5.1 and hides nothing. On CursorBench, Fable is ahead. In multi-hour terminal work it is far ahead. Grok 4.7 wins where nobody looks first - legal tasks and electrical engineering.
Fact
The facts: on 21 September 2026 SpaceXAI released Grok 4.7, which the company says is built on a new, larger base model than Grok 4.6 and trained with a longer reinforcement learning run on a harder mix of tasks, weighted toward ones that take many hours. The price is $2 per million input tokens and $6 per million output tokens, the same as Grok 4.6; a fast variant with twice the output speed costs twice as much. According to SpaceXAI's table, Grok 4.7 (xHigh) scores 46.3% on CursorBench 4.0 against 51.8% for Fable 5.1 (Max) and 41.7% for GPT-5.6 Sol (Max), 37.6% on Terminal-Bench 4.0 against 57.9% for Fable 5.1, and 19.6% on the Harvey Legal Agent Benchmark against 6.7% for Fable 5.1. Per the company, the model tops LatchBio's biosafety benchmark at 62.4% and lets through 3.3% of risky prompts on their HackerBench v0.3. It is available in Cursor, Grok Build and through the API. According to Vercel, the model has a 500K-token context window and is offered at 40% off on their AI Gateway until 27 September.
Where the bill is
Fable 5.1 costs $10 for input and $50 for output. Grok 4.7 costs $2 and $6. Output is more than eight times cheaper, and output is exactly what an agent spends when it works alone all night.
That is the real news. Five and a half points on CursorBench are visible, but they are not a gulf. Twenty points in the terminal are. So if your task is long command-line work, you pay more and take Fable. If it is code, documents and a lot of repetition, the bill starts leaning the other way.
The model that loses in the table can win on the monthly invoice.
The numbers are theirs, from their own table, measured at high effort levels. What it really costs will be known when someone runs it on a real project for a month and shows the spend.
The 40% discount on Vercel's gateway runs until 27 September. If you are going to try it, this week is cheaper.
Official primary sources
SpaceXAI - Introducing Grok 4.7, 21.09.2026Vercel Changelog - Grok 4.7 now available on AI Gateway, fx, and eve, 21.09.2026The visual is generated code-art, no third-party images.