Grok 4.6 Review: xAI's New Flagship — Agent & Coding Upgrade, Pricing & How to Use It
Grok 4.6 Review: xAI's New Flagship — Agent & Coding Upgrade, Pricing & How to Use It
⚡ Quick Answer: Grok 4.6 officially launched on August 12, 2026 — xAI calls it "the most intelligent and fastest model we've built." It's a meaningful agent and coding upgrade over Grok 4.5, scoring better across all ten benchmarks in xAI's launch table. Context stays at 500K tokens, knowledge cutoff is February 1, 2026, and API pricing is unchanged: $2 / $0.50 / $6 per 1M tokens (input / cached input / output) for prompts under 200K. It's live immediately across the xAI API, Grok Build, Cursor, OpenRouter, Vercel and Cloudflare.
What's New in Grok 4.6
After weeks of "Musk time" speculation (rumored Aug 7, slipped, then landed), xAI shipped Grok 4.6 on August 12. The launch-day verdict from early reviewers: this is a meaningful agent and coding upgrade over Grok 4.5 — not a context-window expansion (still 500K) and not a price cut.
What changed:
- Agent & coding focus. Stronger results across all ten benchmarks in xAI's launch table — agentic tool-use, coding (SWE-style), and reasoning all improved.
- Same 500K context window as 4.5, with unchanged long-context pricing tiers.
- Knowledge cutoff Feb 1, 2026 — the same as Grok 4.5.
- Same $2/$6 pricing — no premium for the upgrade.
- Instant availability via xAI API, Grok Build CLI, Cursor, OpenRouter, Vercel and Cloudflare from day one.
In short: if Grok 4.5 was xAI's value coding pick, 4.6 is the same price with a real intelligence bump where it matters most — long-running agentic work and code.
Grok 4.6 API Pricing
| Metric | Grok 4.6 (<200K prompt) | Grok 4.6 (≥200K prompt) |
|---|---|---|
| Input | $2.00 / 1M tokens | $4.00 / 1M tokens |
| Cached input | $0.50 / 1M tokens | $1.00 / 1M tokens |
| Output | $6.00 / 1M tokens | $12.00 / 1M tokens |
| Context window | 500K | 500K |
💡 Pricing note: Requests whose prompt reaches 200K tokens are billed at the higher rate for the entire request — same long-context tiering as Grok 4.5.
Pricing is identical to Grok 4.5 — you get the upgrade for free. That keeps Grok 4.6 one of the best values in the $2 input tier, especially for agent-heavy workloads.
Grok 4.6 vs The 2026 Frontier Lineup
| Model | Input $ | Output $ | Context | Best for |
|---|---|---|---|---|
| Grok 4.6 | $2.00 | $6.00 | 500K | Agentic work, coding, real-time X data |
| Grok 4.5 | $2.00 | $6.00 | 500K | Same price, slightly weaker agent/coding |
| GPT-5.6 Sol | $5.00 | $30.00 | 1.05M | Complex reasoning, professional work |
| GPT-5.6 Terra | $2.00 | $12.00 | 1.05M | Balanced intelligence/cost |
| Claude Opus 5 | $5.00 | $25.00 | 1M | Agentic coding, enterprise |
| Claude Sonnet 5 | $3.00 | $15.00 | 1M | Speed + intelligence balance |
| DeepSeek V4-Pro-0813 | $0.66 | $1.98 | 1M | Budget coding (off-peak pricing) |
Verdict: Grok 4.6 keeps xAI's crown as the strongest pick in the $2 input tier — flagship-adjacent agentic reasoning, the fastest time-to-first-token in its class, and the industry's only real-time X data integration. Opus 5 and GPT-5.6 Sol remain stronger on the hardest reasoning tasks, but at 2.5–5x the price.
What About Grok 4.7 and Grok 5?
xAI's cadence suggests more is coming quickly:
- Grok 4.7 (rumored) — ~2.1T params, "better than 4.6 in every way," expected within weeks of 4.6 (late Aug / early Sep).
- Grok 5 (in training) — the true next-generation flagship, expected around September 2026 per current reports.
Track every release and rumor on our free AI Model Release Tracker.
How to Get Started with Grok 4.6
- Web/app: chat at grok.x.ai — free tier with X integration
- API: model ID
grok-4.6via docs.x.ai, OpenAI-compatible endpoints - Coding: Grok Build CLI for terminal-based agentic development
- Third-party: already live in Cursor, OpenRouter, Vercel and Cloudflare
- Aliases:
<modelname>routes to latest stable;<modelname>-latestto newest
Should You Upgrade from Grok 4.5?
Yes — it's free. Identical pricing, identical context, better agent/coding performance across the board. If you're already on Grok 4.5 via the API, switching the model ID to grok-4.6 (or using the -latest alias) gets you the improvement at zero cost. The only reason to stay on 4.5 is workflow pinning for consistency.
From GPT-5.6 Terra? If you value speed and real-time data over raw reasoning ceiling, Grok 4.6 is a strong alternative at the same $2 input price with half the output cost. Heavy agent users should benchmark both — this is where 4.6 improved most.
FAQ
When was Grok 4.6 released?
Grok 4.6 launched on August 12, 2026 via the xAI API, Grok Build, Cursor, OpenRouter, Vercel and Cloudflare — after earlier rumored dates (Aug 7, Aug 14) slipped.
How much does Grok 4.6 cost?
$2.00 input, $0.50 cached input, $6.00 output per 1M tokens for prompts under 200K. Longer prompts (≥200K) are billed at $4 / $1 / $12 per 1M tokens for the entire request.
Is Grok 4.6 better than Grok 4.5?
Yes — xAI reports improvements across all ten launch benchmarks, focused on agentic tool-use and coding. It's the same price and context (500K), so it's a strictly better default.
What is Grok 4.6's context window and knowledge cutoff?
500K tokens context window (same as Grok 4.5), knowledge cutoff February 1, 2026.
What's the difference between Grok 4.6 and Grok 5?
Grok 4.6 is released and is the current flagship. Grok 5 is still in training — the true next-generation flagship, expected around September 2026, with Grok 4.7 (a rumored 2.1T-param intermediate) potentially arriving first.
Updated August 17, 2026 with data from xAI official docs and launch-day reporting. Compare live prices on our AI Model Pricing page, or track every release on the AI Model Release Tracker. Related: Grok 4.5 Full Review, Grok 5: Everything We Know.
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