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
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.
Changelog
- 2026-09-29: created
Related events
- SpaceXAI releases Grok 4.7 with a new larger base model and new safeguard stack ★★★★
- SpaceX absorbs xAI in a $1.25 trillion merger (later rebranded SpaceXAI) ★★★★
- SpaceX (incl. xAI) lists on Nasdaq in record $75B IPO ★★★★
- xAI releases Grok Voice Think Fast 2.0 speech-to-speech model for voice agents ★★★
Sources (3)
- officialIntroducing Grok 4.6 | SpaceXAI
- press9to5Mac - SpaceXAI releases Grok 4.6
- pressDataNorth - xAI releases Grok 4.6 flagship model
id: 2026-08-12-grok-4-6 · updated 2026-09-29 · open in the interactive timeline