xAI API API
x.ai
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Overview
Researched from the vendor's own pages; every fact links to its source and the day we checked it.
xAI API at https://api.x.ai/v1 for Grok language, image, video, voice and embedding models; batch, prompt caching and remote MCP tools. Rate-limit tiers by cumulative spend since 2026-01-01 (Tier 0 $0, Tier 1 $50, Tier 2 $250, Tier 3 $1,000, Tier 4 $5,000); hard RPS and TPM caps per model; 429 when exceeded.
Company
- Legal name
- Not confirmed
- Headquarters
- Not confirmed
- Founded
- Not confirmed
- Employees
- Not confirmed
- Ownership
- Not confirmed
- Kind
- Infrastructure
- Website
- Not confirmed
API
Verified- Access
- Self-serve API
- Style
- REST
- Auth
- Not confirmed
- Base URL
https://api.x.ai/v1- Features
- Bulk YesAsync —Webhooks —MCP —Sandbox —
- Rate limit
- Per-model RPS/TPM by spend tier; e.g. grok-4.20 37 RPS / 10M TPM at Tier 0
Pricing
- Model
- pay as you go
- List prices
- Grok (500k context) $2.00 / 1M input tokens
- Currency
- USD
- Units
- 1M tokens
- Free tier
- Not confirmed
- Checked
- Sep 29, 2026
Compliance
- SOC 2
- Not confirmed
- GDPR
- Not confirmed
- CCPA
- Not confirmed
- DPA
- Not confirmed
- Resale / storage
- Unknown until a written agreement says otherwise
Relationships
- Integrations
- Not confirmed
- Alternatives
- None named by the vendor
Sources (2)
- xAI models and pricingchecked Sep 29, 2026
- xAI rate limitschecked Sep 29, 2026
Placement in the Grid
Where this vendor sits on the GridRouter Grid in each category it serves. No vendor pays for placement.
| Category | Placement | Execute | Coverage | Calls | Report |
|---|---|---|---|---|---|
| AI Utilities | Not yet rated | – | – | 0 | View Grid |
API
The vendor's OpenAPI document as stored in the catalog, its operations, and the rate limits it publishes.
Rate limits
| Limit | Scope | Plan | Endpoint | Burst / concurrency |
|---|---|---|---|---|
| 37 / second | plan | Tier 0 | grok-4.20-0309-reasoning | — / — |
| 50 / second | plan | Tier 1 | grok-4.20-0309-reasoning | — / — |
| 75 / second | plan | Tier 2 | grok-4.20-0309-reasoning | — / — |
| 125 / second | plan | Tier 3 | grok-4.20-0309-reasoning | — / — |
| 208 / second | plan | Tier 4 | grok-4.20-0309-reasoning | — / — |
On 429: Exceeding any RPS or TPM limit returns 429 Too Many Requests. GridRouter never paces above these and backs off on 429, honoring Retry-After. Source, checked Sep 29, 2026