Grok 4.6 API Review 2026: 500K, Coding & Agents
Grok 4.6 is xAI's current flagship model for coding, agentic tool use, and long-running technical work. It was released on August 12, 2026 with model ID grok-4.6, a 500K-token context window, configurable reasoning, and official xAI API pricing of $2 per million input tokens and $6 per million output tokens.
On this gateway, grok-4.6 is available at one uniform 10x rate, approximately CNY 4 per million tokens. There is no separate short-context and long-context multiplier. This guide separates xAI's official specifications from gateway-specific pricing so teams can evaluate the model without mixing two billing systems.
Try it with a small request first: check the live model pricing or start from the API purchase page. Model availability and billing records remain authoritative at request time.
Grok 4.6 key stats
| Item | Verified information |
|---|---|
| Official release | August 12, 2026 |
| API model ID | grok-4.6 |
| Context window | 500K tokens |
| Official xAI API price | $2/M input, $6/M output |
| Gateway multiplier | Uniform 10x |
| Gateway reference rate | About CNY 4/M tokens |
| Main focus | Coding, tool use, agents, technical and long-running work |
| Reasoning | Configurable reasoning effort |
| Official knowledge cutoff | February 1, 2026 |
| Gateway image-input status | Not yet confirmed; test before relying on it |
Last checked: August 13, 2026. Prices, limits, and route capabilities can change; confirm them on the live pricing page before a production rollout.
What changed in Grok 4.6?
xAI describes Grok 4.6 as a model for ambitious, long-running projects rather than a minor chat update. The official release highlights three practical changes.
First, xAI ran a longer supplemental training phase than it used for Grok 4.5. The training mix included generated reasoning and technical data together with high-quality engineering data. Second, the model was trained to do more self-testing and verification during longer task trajectories. Third, xAI focused on stronger first-pass results for interactive and visual software projects.
For developers, those claims matter most when a task spans repository search, planning, tool calls, code edits, tests, and follow-up fixes. A 500K context window also allows larger codebases or document sets to fit in a single working session, although usable context depends on the client, system instructions, tool transcripts, and output budget.
Grok 4.6 is available through the xAI API and xAI lists Cursor, Grok Build, OpenRouter, Vercel, and Cloudflare among its launch integrations. Availability through a named integration does not guarantee identical rate limits, features, or billing across providers.
Official Grok 4.6 benchmark results
xAI's launch article reports the following selected results:
| Benchmark | Grok 4.6 official result |
|---|---|
| Artificial Analysis Intelligence Index | 61 |
| GDPval-AA v2 Elo | 1753 |
| CursorBench v3.2 | 69.9% |
| DeepSWE v1.1 | 65.9% |
| APEX Agents | 57.5% |
| APEX-SWE | 56.4% |
These are vendor-published or linked third-party benchmark results, not an independent test by this site. They are useful evidence of capability direction, but they do not predict success on your repository. Agent scores can change with the harness, reasoning effort, tool permissions, timeout, starting commit, and acceptance tests.
A fair internal evaluation should pin the same repository and task set for every model. Record accepted-task rate, first-pass completion, test pass rate, tool failures, elapsed time, tokens, and engineer rework instead of comparing only a single leaderboard number.
Grok 4.6 price: official API vs this gateway
There are two different price references:
| Billing surface | Input reference | Output reference | Notes |
|---|---|---|---|
| xAI direct API | $2/M tokens | $6/M tokens | Official standard Grok 4.6 price |
| This gateway | 10x, about CNY 4/M tokens | Check live ledger | One multiplier; no context-length tiers |
The gateway rate is not a currency conversion of xAI's direct API list price. It is a separate platform billing model. Output weighting, account group, promotions, cached tokens, or later platform changes may affect the final ledger, so estimate with the live price page and verify with a small real request.
The uniform-rate point is important: the gateway does not switch Grok 4.6 to a higher multiplier when a prompt crosses a context threshold. The current catalog lists one 10x rate and a 500K context window.
Need a controlled cost check? Buy a small balance on the purchase page, send one short non-streaming request, and compare prompt tokens, completion tokens, and the account ledger before testing long context.
How to call Grok 4.6 through the API
Use the exact model ID grok-4.6. A minimal OpenAI-compatible request looks like this:
curl https://api.llm-token.cn/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "grok-4.6",
"messages": [
{"role": "user", "content": "Review this function and list the two highest-risk bugs."}
]
}'
Start with a short, non-streaming text request. Confirm the HTTP status, returned model, token usage, latency, and billing record. Then test streaming, tool calls, reasoning settings, and long context independently. This sequence makes it easier to tell a route problem from a client or payload problem.
Never put a real API key in a repository, screenshot, support ticket, or browser-side bundle. Use your client's secure secret store and rotate a key if it has been exposed.
Best use cases for Grok 4.6
Grok 4.6 is a strong candidate for work where quality matters more than minimum per-request cost:
- Repository-level code analysis and implementation
- Long-running coding agents that inspect, edit, test, and retry
- Technical research across large document collections
- Complex planning with multiple tools or data sources
- Interactive web applications and first-pass prototypes
- Long prompts that exceed the comfortable range of smaller-context models
It may be excessive for classification, short summaries, template filling, or very high-volume simple chat. For those workloads, compare a lower-multiplier route from the model list and route only the difficult tail to Grok 4.6.
For a lower-cost 1M-context coding route, compare the verified specs in the DeepSeek-V4-Pro-0813 API and Codex guide.
Production evaluation checklist
- Copy the exact model ID
grok-4.6from the live model catalog. - Run a short, deterministic smoke request before enabling tools or streaming.
- Test your real P50 and P95 prompt sizes; do not assume every client exposes all 500K tokens.
- Compare accepted output, not only raw benchmark scores.
- Set timeouts, maximum output, tool-call limits, and a total task budget.
- Keep write, payment, deployment, and infrastructure actions behind explicit approval.
- Log request IDs, selected route, status, latency, usage, and final outcome.
- Maintain a fallback model for capacity, timeout, or provider incidents.
Frequently asked questions
Is Grok 4.6 officially released?
Yes. xAI published the official Grok 4.6 release on August 12, 2026 and lists grok-4.6 in its current model documentation.
What is the Grok 4.6 context window?
The official context window is 500K tokens. This is the maximum model window, not a promise that every client or integration will accept a prompt of exactly that size.
How much does Grok 4.6 cost?
xAI lists $2 per million input tokens and $6 per million output tokens for the standard direct API. This gateway currently lists a uniform 10x multiplier, approximately CNY 4 per million tokens, without a context-length surcharge.
Is Grok 4.6 better than Grok 4.5 for coding?
xAI's published coding and agent benchmarks are stronger in several areas, and the launch specifically emphasizes long-running engineering work. Test both models on the same repositories and acceptance commands before changing a production default.
Does Grok 4.6 support image input on this gateway?
The gateway catalog currently marks image-input capability as unconfirmed. Do not infer image support from Grok 4.6's ability to build visual applications; validate an image request on the exact route first.
Which model ID should I use?
Use grok-4.6. Avoid guessed dated aliases unless they appear in the live model list.
Where can I buy or top up API access?
New users can start on the buy page. Existing users can use top-up.
Primary sources
- xAI: Introducing Grok 4.6: release date, training focus, integrations, benchmarks, and official launch pricing
- xAI model documentation: model ID, 500K context, reasoning, price, and knowledge cutoff
- Gateway model guide: current route ID, context label, multiplier, and capability status