Grok 4.6 API pricing and setup
Grok 4.6 (grok-4.6) is a xAI model. It is available through the relay.fast API with one relay.fast key and pay-as-you-go billing.
Prices checked from the live catalog. "From" is the lowest price among the relay.fast sources that currently serve the model. The price you pay depends on the source your request uses and can change on any day. The pricing page always shows current values.
| Official input price | $2 per 1M tokens |
|---|---|
| Official output price | $6 per 1M tokens |
| relay.fast input from | $0.0333 per 1M tokens |
| relay.fast output from | $0.1 per 1M tokens |
| Cache read from | $0.00833 per 1M tokens |
| Lower than the official price by | up to 98% |
| Context window | 500K tokens |
| Endpoints | /v1/chat/completions |
requests above 200K input tokens cost more
Example request
Keep the key in the RELAY_FAST_API_KEY environment variable.
curl https://relay.fast/v1/chat/completions \
-H "Authorization: Bearer $RELAY_FAST_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"grok-4.6","messages":[{"role":"user","content":"Hello"}]}'Use Grok 4.6 in coding tools
Setup guides: Claude Code, Codex, Cursor, Cline, Kilo Code, OpenCode, Aider. The API docs have one-command installers.
Frequently asked questions
How much does the Grok 4.6 API cost?
On 2026-11-05, relay.fast charges from $0.0333 per 1M input tokens and $0.1 per 1M output tokens for Grok 4.6, against the official $2 and $6. The price depends on the source your request uses and can change; https://relay.fast/pricing/grok-4.6 shows the current value.
What is the context window of Grok 4.6?
Grok 4.6 accepts up to 500K tokens of context in the relay.fast catalog. Output limits depend on the model and client settings.
Which API endpoint does Grok 4.6 use?
Call /v1/chat/completions with a relay.fast API key. OpenAI-compatible SDKs use the base URL https://relay.fast/v1.
Do I need a xAI account to use Grok 4.6?
No. You use a relay.fast account and API key. relay.fast is an independent API gateway and is not affiliated with xAI.