Grok 4.20 0309 Reasoning API Pricing
Grok 4.20 0309 Reasoning costs $1.25 per 1M input tokens and $2.50 per 1M output tokens. These rates were last verified on .
Published rates and billing units
| Billing dimension | USD list price |
|---|---|
| Input / 1M tokens | $1.25 |
| Output / 1M tokens | $2.50 |
| Cached input / 1M tokens | $0.20 |
| Requests at least 200,000 input tokens: Input / 1M tokens | $2.50 |
| Requests at least 200,000 input tokens: Cached input / 1M tokens | $0.40 |
| Requests at least 200,000 input tokens: Output / 1M tokens | $5.00 |
Verified 2026-11-12 · Official source · Pricing methodology. Taxes, optional services and account-specific discounts are not included.
Cost examples
These examples use published list prices only. They exclude taxes, enterprise discounts, minimum charges, retries, batch discounts, and provider-specific billing rules.
1M input + 1M output
$7.50
A direct per-million comparison against every other text model.
100K input + 25K output
$0.1875
A compact chat, summarization, or analysis workload.
10M input + 2M output
$35.00
A monthly production estimate for heavier RAG or agent traffic.
75% cached input + 250K output
$2.18
Cached input is about 84% cheaper than standard input at list price.
Calculator for Grok 4.20 0309 Reasoning
Enter your own input, output, and cached-token assumptions. This calculator is preloaded with only Grok 4.20 0309 Reasoning, so the result stays focused on this model.
Input cost
$2.50
Output cost
$5.00
Total
$7.50
Long-context rates apply because this request exceeds 200,000 input tokens.
Price history
No list-price movement across 115 daily snapshots from 2026-07-20 to 2026-11-11.
When to use Grok 4.20 0309 Reasoning
Good fit
- reasoning-heavy prompts, planning, analysis, and multi-step tool use
- long-document and repository-scale prompts where context window matters
Be careful with
- blind migration without testing your own prompts, latency, and failure modes