---
id: "2026-09-21-grok-4-7"
url: "https://postcutoff.com/e/2026-09-21-grok-4-7/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2026-09-21"
date_precision: day
category: model-release
importance: 4
confidence: high
status: [Confirmed]
sources: 4
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-09-21-grok-4-7/

# SpaceXAI releases Grok 4.7 with a new larger base model and new safeguard stack

On 2026-09-21 SpaceXAI released Grok 4.7, its most capable model for coding and knowledge work, built on a new, larger base model than Grok 4.6 and a longer RL run weighted toward multi-hour tasks. It keeps Grok 4.6's $2/$6 pricing and ships with a new safeguard stack (3.3% risky-prompt pass rate on xAI's HackerBench v0.3).

## Key facts
- Released 2026-09-21 in Cursor, Grok Build, the Grok API, third-party coding harnesses, routers and cloud platforms
- Price: $2 per 1M input / $6 per 1M output tokens; fast variant at 2x price for 2x output speed
- New, larger base model than Grok 4.6; longer RL run on tasks that take many hours
- CursorBench 4.0: 46.3%; DeepSWE v1.1 (high effort): 71.0%; Terminal-Bench 4.0: 37.6%; EEBench: 64.0% (xAI)
- AA Briefcase v1.1: 1,657; Harvey Legal Agent Benchmark: 19.6%; HealthBench Professional: 56.7% (xAI)
- Safety: HackerBench v0.3 - only 3.3% of risky dual-use cyber prompts allowed; LatchBio biosafety: 62.4%
- SiliconANGLE: on EEBench (chip design) it beat Fable 5.1 but trailed GPT-6 Astra
- Grok Voice Transcribe 2.0 was released the Friday before (per SiliconANGLE)

## What happened

Just six weeks after Grok 4.6, SpaceXAI shipped **Grok 4.7** (2026-09-21). xAI says it works longer on difficult tasks
and checks its own work more carefully. It uses a new, larger base model and a longer reinforcement-learning run
on a harder task mix weighted toward problems that take many hours. Price and speed are unchanged from Grok 4.6.

xAI-reported results include CursorBench 4.0 46.3%, DeepSWE v1.1 71.0% (high effort), Terminal-Bench 4.0 37.6%,
EEBench 64.0%, AA Briefcase v1.1 1,657, Harvey Legal Agent Benchmark 19.6% and HealthBench Professional 56.7%.
It also introduced "an entirely new safeguard stack", with xAI claiming its strongest refusal/jailbreak resistance
yet while keeping legitimate security work unblocked (HackerBench v0.3: 3.3% risky prompts allowed).

## Why it matters

xAI's rapid 4.x cadence (4.5 -> 4.6 -> 4.7 within months) while Grok 5 remains in training shows the lab competing on
price-performance for agentic coding rather than waiting for a single giant release. The emphasis on safety
benchmarks is also a shift for xAI, which had been criticized for weak safeguards.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 144 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 83 days after its cutoff
- Gemini 4 Hydrogen (training cutoff March 2026): 174 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 113 days after its cutoff

## Sources

1. [Introducing Grok 4.7 | SpaceXAI](https://x.ai/news/grok-4-7) (x.ai, official)
2. [SiliconANGLE - SpaceX launches Grok 4.7 with long-horizon processing, safety upgrades](https://siliconangle.com/2026/09/21/spacex-launches-grok-4-7-with-long-horizon-processing-safety-upgrades/) (siliconangle.com, press)
3. [Unite.AI - SpaceXAI releases Grok 4.7 for coding and knowledge work](https://www.unite.ai/spacexai-releases-grok-4-7-for-coding-and-knowledge-work/) (unite.ai, press)
4. [TestingCatalog - SpaceXAI releases Grok 4.7](https://www.testingcatalog.com/spacexai-releases-grok-4-7-for-coding-and-knowledge-work/) (testingcatalog.com, press)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2026-08-12: [SpaceXAI releases Grok 4.6, matching GPT-5.6 Sol on the AA Intelligence Index](https://postcutoff.com/e/2026-08-12-grok-4-6/index.md)
- 2026-02-02: [SpaceX absorbs xAI in a $1.25 trillion merger](https://postcutoff.com/e/2026-02-02-spacex-acquires-xai/index.md)
- Archived: 1 post, listed in https://postcutoff.com/e/2026-09-21-grok-4-7/index.json