SpaceXAI's newest flagship, replacing Grok 4.5 at the same standard-tier price. Pricing is tiered: $2/$6 per 1M tokens under 200K, $4/$12 per 1M once a request crosses 200K.
Grok 4.6 bills $2 / 1M input and $6 / 1M output for prompts under 200K tokens — unchanged from Grok 4.5. Once a request reaches 200K tokens, the entire request is billed at $4 / 1M input and $12 / 1M output. Cached input rose to $0.50 / 1M at the standard tier, up from $0.30 on 4.5.
SpaceXAI (the company formerly known as xAI, rebranded July 6, 2026 after fully merging into SpaceX) released Grok 4.6 on August 12, 2026, replacing Grok 4.5 as the flagship at the same $2/$6 standard-tier price. Grok's product name and API are unaffected by the corporate rebrand. The headline pricing change from 4.5 is cached input, which rose from $0.30 to $0.50 per 1M at the standard tier — everything else on the rate card carries over unchanged.
The model keeps the 500K-token context window, configurable low/medium/high reasoning effort, function calling, web and X search, and code execution that defined 4.5. Pricing stays tiered: requests under 200K tokens bill at $2 input / $6 output per 1M, but once a prompt reaches 200K tokens the whole request bills at $4 input / $12 output.
Grok 4.6 is built for coding and agentic work: tool-use loops, code execution, and real-time retrieval from the web and X. Its token efficiency and standard-tier output price make it attractive for high-volume agent runs, while native X search keeps its edge on current events and social context. The tiered pricing means the model rewards keeping prompts under 200K tokens — worth engineering around if your workload sits near the boundary. Availability spans the SpaceXAI API console, Grok Build, Cursor, OpenRouter, Vercel, Cloudflare, and Microsoft Office add-ins.
| Model | Input / 1M | Output / 1M | Context |
|---|---|---|---|
| Grok 4.6 (<200K) | $2 | $6 | 500K |
| Grok 4.6 (≥200K) | $4 | $12 | 500K |
| Grok 4.3 | $1.25 | $2.50 | 1M |
| Claude Opus 5 | $5 | $25 | 1M |
| GPT-5.6 Sol | $5 | $30 | 1M |
| Gemini 3.1 Pro | $2 | $12 | 1M |
Grok 4.6 undercuts the other flagships sharply on standard-tier output price — half of Gemini 3.1 Pro and a fifth of GPT-5.6 Sol — while claiming Opus-class quality. For a cheaper reasoning workhorse under the flagship, Grok 4.3 is SpaceXAI's mid-tier option.