---
id: "2026-08-12-grok-4-6"
url: "https://postcutoff.com/e/2026-08-12-grok-4-6/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2026-08-12"
date_precision: day
category: model-release
importance: 4
confidence: high
status: [Confirmed]
sources: 8
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/2026-08-12-grok-4-6/

# SpaceXAI releases Grok 4.6, matching GPT-5.6 Sol on the AA Intelligence Index

On 2026-08-12 SpaceXAI (xAI after its merger with SpaceX) released Grok 4.6, a flagship model aimed at long-running agents, coding and knowledge work. It scored 61 on the Artificial Analysis Intelligence Index - tied with OpenAI's GPT-5.6 Sol and one point behind Anthropic's Claude Fable 5 - at $2/$6 per million input/output tokens.

## Key facts
- Released 2026-08-12; builds on Grok 4.5
- Artificial Analysis Intelligence Index: 61 (ties GPT-5.6 Sol at max reasoning; 1 point behind Claude Fable 5 Max)
- GDPVal-AA v2: 1753; CursorBench v3.2: 69.9%; DeepSWE v1.1: 65.9%; FrontierCode v1.1: 61.3% (xAI)
- Price: $2 per 1M input tokens, $6 per 1M output tokens; fast variant costs 2x
- Available in Grok Build, Cursor, xAI API (console.x.ai), OpenRouter, Vercel and Cloudflare
- 2x included usage in Cursor and Grok Build for the first week
- Reported (DataNorth): 500,000-token context window and knowledge cutoff of 2026-02-01
- xAI attributes gains to a longer supplemental training run, stronger engineering data and expanded RL for coding and knowledge work
- Cloud availability: Amazon Bedrock (Aug 19), Gemini Enterprise Agent Platform / Vertex Model Garden (Aug 21; $2 input, $0.50 cached, $6 output per 1M tokens), Microsoft Foundry (Aug 26); GitHub Copilot from Aug 14
- xAI's partner posts confirm a 500K-token context window and reasoning effort low/medium/high/xhigh
- LatchBio independent bio evaluation (xAI post, Sept 1): on BioSecBench-Refusal Grok 4.6 averaged 62.1% (harmonic mean), refusing 59.2% of disguised red-team tasks and completing 64.8% of routine ones, the only model above 50% on both; BioSecBench-Surveillance 53.5% (behind Opus 5, ahead of GPT-5.6 Sol)

## What happened

SpaceXAI released **Grok 4.6** on 2026-08-12, positioning it for tasks that stay open across many steps: research,
analysis, working across a codebase, and turning an idea into a finished app or artifact, with improved self-testing
and verification on long task sequences and stronger first drafts of visual/interactive projects.

xAI-reported benchmarks: Artificial Analysis Intelligence Index 61, GDPVal-AA v2 1753, CursorBench v3.2 69.9%,
DeepSWE v1.1 65.9%, FrontierCode v1.1 61.3%. Pricing is $2 / $6 per million input/output tokens, with a faster
variant at double the price. It launched in Cursor, xAI's Grok Build coding tool, the xAI API, OpenRouter, Vercel
and Cloudflare.

Grok 5 was **not** released: as of September 2026 trackers report it still in training (reportedly on the
Colossus 2 cluster in Memphis), with no official model card.

## Why it matters

Grok 4.6 put xAI level with OpenAI's then-current flagship on the most-cited aggregate index, at a notably low price,
and signaled xAI's pivot toward coding/agentic workloads distributed through Cursor and its own Grok Build tool.

The 500K context window and knowledge-cutoff figures come from secondary coverage (DataNorth), not the official post.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 104 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 43 days after its cutoff
- Gemini 4 Hydrogen (training cutoff March 2026): 134 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 73 days after its cutoff

## Sources

1. [Introducing Grok 4.6 | SpaceXAI](https://x.ai/news/grok-4-6) (x.ai, official)
2. [SpaceXAI - Grok 4.6 on Gemini Enterprise Agent Platform](https://x.ai/news/grok-4-6-vertex-ai) (x.ai, official)
3. [SpaceXAI - Grok 4.6 on Microsoft Foundry](https://x.ai/news/grok-4-6-microsoft-foundry) (x.ai, official)
4. [SpaceXAI - Grok 4.6 on Amazon Bedrock](https://x.ai/news/grok-4-6-amazon-bedrock) (x.ai, official)
5. [SpaceXAI - Grok 4.6 in GitHub Copilot](https://x.ai/news/grok-4-6-github-copilot) (x.ai, official)
6. [SpaceXAI - Biosecurity at the frontier (LatchBio evaluation)](https://x.ai/news/biosafety-at-the-frontier) (x.ai, official)
7. [9to5Mac - SpaceXAI releases Grok 4.6](https://9to5mac.com/2026/08/12/spacexai-releases-grok-4-6/) (9to5mac.com, press)
8. [DataNorth - xAI releases Grok 4.6 flagship model](https://datanorth.ai/news/xai-releases-grok-4-6) (datanorth.ai, press)

## Changes

- 2026-09-30: Added cloud availability posts (Bedrock, Vertex, Foundry, Copilot), confirmed 500K context and effort levels, and the LatchBio biosecurity evaluation
- 2026-09-29 (filed): Created

## Related

- 2026-09-21: [SpaceXAI releases Grok 4.7 with a new larger base model and new safeguard stack](https://postcutoff.com/e/2026-09-21-grok-4-7/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)