Grok 4.6 is SpaceXAI’s new flagship, released 12 August 2026. The company says it matches OpenAI’s GPT-5.6 Sol on the Artificial Analysis Intelligence Index (a composite of nine benchmarks) at 61, while starting at $2 per million input tokens and $6 per million output tokens.
Day one it was already in Cursor and Grok Build, with a first-week 2× included usage promo to pull developers onto the new weights. That promo is the reason Cursor timelines filled with 4.6 screenshots the same afternoon.
What is actually new versus Grok 4.5
SpaceXAI is not selling a bigger chat window as the story. The story is staying on a task:
- Longer supplemental training, then SFT trajectories regenerated with Grok 4.5 and cleaned with model-based filters
- Agent RL across coding, knowledge work, kernels, web apps, and CAD-style environments
- Stronger first pass on visual / interactive apps
- More self-testing on long trajectories — check work before the next step
- A new xhigh reasoning effort on top of low / medium / high
Context is 500k tokens. Inputs are text and image. There is a fast variant at 2× price. Prompts that hit a 200k-token threshold can move onto a more expensive long-context meter on the native API — read the current docs before you dump a whole monorepo into one call.
Benchmarks SpaceXAI published (Grok 4.6 High)
These are the company’s comparison table, not a Techlo.pk re-bench:
- AA Intelligence Index: 61 (tied with GPT-5.6 Sol; Grok 4.5 High was 56)
- GDPVal-AA v2 Elo: 1753 (ahead of GPT-5.6 Sol Max’s 1728 in that table)
- CursorBench v3.2: 69.9%
- DeepSWE v1.1: 65.9% (still behind GPT-5.6 Sol Max at 73% in the same table)
- FrontierCode v1.1 Extended: 61.3%
- Terminal-Bench v3.0: 26% (improved vs 4.5, still behind GPT/Fable in that snapshot)
Read that as: stronger general agent + knowledge work, not an automatic win on every SWE leaderboard.
Where to run it
- Cursor — desktop, cloud agents, iOS, CLI, SDK
- Grok Build at x.ai/build
- SpaceXAI API
- OpenRouter, Vercel, Cloudflare
- GitHub Copilot (partner announcement)
- Amazon Bedrock as of 19 August
Composer (Cursor’s fast everyday model) and Grok 4.5 remain available. You do not have to put 4.6 on every tab-complete.
Why Pakistani developers should care
Cursor is already the default AI editor in a lot of Lahore, Karachi, and Islamabad product teams. A model that is good at turning a vague product idea into a first version is more useful here than a 2-point bump on an academic math test — especially for agencies shipping MVPs on tight retainers.
Watch the bill. At $6/M output, an unsupervised agent that loops is not “cheap GPT.” Use high/xhigh on hard tickets; keep Composer or Gemini Flash for the rest. Our head-to-head with Gemini 3.7 Flash covers that split.
Safety: SpaceXAI says 4.6 had its widest pre-deployment eval suite yet, including third-party tests. If you use it for vulnerability patching, keep the same human review you would use for any frontier model.