Grok 4.6

What Is Grok 4.6?

Grok 4.6 is an xAI language model released in August 2026 as a focused update to Grok 4.5 rather than a ground-up retraining. According to xAI, it went through a longer supplemental training run than Grok 4.5, with a focus on long-running agents and more ambitious interactive and visual work. xAI's documentation lists a 500K-token context window and text and image input.

What It's Good For

The practical strengths of Grok 4.6 cluster around sustained, multi-step tasks rather than one-shot lookups:

• Long-horizon agent work: xAI says Grok 4.6 stays with complex tasks across many steps, whether researching a topic, working across a codebase or turning an idea into a polished application, and shows more self-testing and verification on longer trajectories. xAI reports 57.5% on APEX-Agents, up from 47.1% for Grok 4.5.
• Code generation: xAI reports 69.9% on CursorBench v3.2, and the model is available inside Cursor.
• Knowledge work: xAI reports 1,753 on GDPVal-AA v2, the highest score in its comparison table, ahead of GPT-5.6 Sol at 1,728 and Fable 5 Max at 1,741.
• Visual and interactive projects: xAI says first passes are stronger than Grok 4.5's, establishing the structure and visual language of an application in one pass.
• Overall standing: xAI says Grok 4.6 matches GPT-5.6 Sol on the Artificial Analysis Intelligence Index.

Who It's a Good Fit For

For developers building agents that complete multi-step tasks, such as research pipelines, codebase traversal or iterative application building, Grok 4.6 sits close to GPT-5.6 Sol and Fable 5 Max on xAI's reported benchmarks. It is offered in Cursor and Grok Build, through the xAI API, and through partners including OpenRouter, Vercel and Cloudflare.

The model is also a reasonable fit for teams that need text reasoning and image understanding in the same request, since image input is built in.

Limitations and Where It Falls Short

Several concrete limitations are worth evaluating before committing:

• Coding benchmarks: On DeepSWE v1.1, xAI reports 65.9% for Grok 4.6, behind GPT-5.6 Sol at 73% and Fable 5 Max at 70%. On Terminal-Bench v3.0 it scores 26%, against 34.6% and 34.1% for those two models.
• Mixed picture overall: In xAI's own comparison table, Fable 5 Max leads Grok 4.6 on most of the listed evaluations, even though Grok 4.6 leads on a few.
• Long-context pricing: xAI's documentation says requests that exceed the 200K context window are charged at higher rates, so workloads that regularly approach that boundary should budget for it.