Grok 4.3: what it costs to run
The price xAI lists for Grok 4.3, what a support reply, a document summary and an agent task cost at it, and where that puts it among 37 models.
US dollars per million tokens, standard rate, shortest context band.
- 1,000 support replies
- $4.75
- Cached input
- $0.20
- Context window
- 1,000,000 tokens
- Released
- Not published
- Weights
- Closed
From xAI’s own pages, 22 September 2026.
Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens on xAI’s own API, and $0.20 for cached input. At those prices 1,000 support replies cost $4.75, the 16th cheapest of 33 priced models on our list.
What a job costs
Three jobs, 1,000 runs of each, at the list price above, and where each puts Grok 4.3 among the 33 models with a list price.
| Job | 1,000 runs | Among 33 |
|---|---|---|
| Support reply3,000 in, 400 out. | $4.75 | 16th cheapest |
| Document summary25,000 in, 1,000 out. | $33.75 | 17th most expensive |
| Agent task80,000 in (70,000 cached), 3,000 out. | $34.00 | 16th cheapest |
The token counts are ours, chosen to look like real work; the prices are xAI’s. All three jobs stay under 200,000 tokens a request, below every long-context surcharge on the list.
Grok 4.3 on real small-business tasks
What the AIGROW benchmark measured when Grok 4.3 was given 20 office tasks, each marked pass or fail by fixed checks.
- Success rate
- 80% of 20 runs passed (95% interval 58 to 92%), 18th of 36 models.
- Cost per 1,000 passes
- $4.10, failed runs included.
- Answer time
- 7.4 s median, 9.7 s at the 90th percentile.
- Strongest and weakest
- Appointment scheduling (100% passed) and review replies (0%).
The small print
What the base rate above leaves out, copied from the maker’s pages: surcharges, discounts, promotions and cache pricing.
Prompts of 200K tokens or more: $2.50 / $5, cached $0.40. Batch 20% off. xAI no longer lists 'fast' variants; this is its low-cost model. Release date not stated on the official pages.
Grok 4.3 against the models it is weighed with
Each comparison puts both list prices side by side and costs the same three jobs on each.
- vs Gemini 3.8 Flash
- xAI's low-cost model against Google's mid tier, with cheaper output on the Grok side.
- vs DeepSeek V4.1 Flash
- xAI's cheapest model against DeepSeek's, for teams comparing low-cost options outside OpenAI and Google.
Other xAI models
| Model | Input | Output | Context | 1,000 replies |
|---|---|---|---|---|
| Grok 4.7xAI | $2.00 | $6.00 | 500K | $8.40 |
Where the price comes from
Read on 22 September 2026. Each price is the standard rate for the shortest context band, with no batch or priority discount; long-context surcharges, batch rates and promotions are in each model’s small print. No price was taken from a reseller.
Pay a quarter of list price
AIGROW API credit is metered at the makers’ list prices, and $25 buys $100 of usage. The credit page lists the models it covers; ask about any other before buying.
Prices checked 22 September 2026