xAI
Grok 4.20 Reasoning token cost
Grok 4.20 reasoning SKU at the same $1.25/$2.50 short-context list as Grok 4.3, with 1M context.
Published list rates
Input
$1.25
per 1M tokens
Output
$2.50
per 1M tokens
Cached input
$0.2
per 1M tokens
Context window
1,000,000
tokens
Pricing source: xAI API pricing
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Project monthly volume
Daily requests × tokens per request × 30 days.
Estimated cost
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Cost as volume grows
What Grok 4.20 Reasoning costs if you only send tokens, only get a reply, or do both (70% in / 30% out). Rows start small and go up to huge traffic.
| Tokens | Input only | Output only | Mix (70% in / 30% out) |
|---|---|---|---|
| 1 | $0.000001 | $0.000002 | $0.000002 |
| 10 | $0.000013 | $0.000025 | $0.000016 |
| 100 | $0.000125 | $0.00025 | $0.000163 |
| 200 | $0.00025 | $0.0005 | $0.000325 |
| 300 | $0.000375 | $0.00075 | $0.000488 |
| 400 | $0.0005 | $0.001 | $0.00065 |
| 500 | $0.000625 | $0.00125 | $0.000813 |
| 1,000 | $0.00125 | $0.0025 | $0.001625 |
| 2,000 | $0.0025 | $0.005 | $0.00325 |
| 5,000 | $0.00625 | $0.0125 | $0.008125 |
| 10,000 | $0.0125 | $0.025 | $0.01625 |
| 25,000 | $0.03125 | $0.0625 | $0.04063 |
| 50,000 | $0.0625 | $0.125 | $0.08125 |
| 100,000 | $0.125 | $0.25 | $0.1625 |
| 250,000 | $0.3125 | $0.625 | $0.40625 |
| 500,000 | $0.625 | $1.25 | $0.8125 |
| 1,000,000 | $1.25 | $2.50 | $1.625 |
| 5,000,000 | $6.25 | $12.50 | $8.125 |
| 10,000,000 | $12.50 | $25.00 | $16.25 |
| 50,000,000 | $62.50 | $125.00 | $81.25 |
| 100,000,000 | $125.00 | $250.00 | $162.50 |
| 500,000,000 | $625.00 | $1,250.00 | $812.50 |
| 1,000,000,000 | $1,250.00 | $2,500.00 | $1,625.00 |
| 10,000,000,000 | $12,500.00 | $25,000.00 | $16,250.00 |
| 100,000,000,000 | $125,000.00 | $250,000.00 | $162,500.00 |
Tokens for a fixed budget
If you cap spend, this is roughly how many Grok 4.20 Reasoning tokens that money buys.
| Budget | Input tokens | Output tokens | Mixed tokens (70/30) |
|---|---|---|---|
| $0.01 | 8,000 | 4,000 | 6,154 |
| $0.1 | 80,000 | 40,000 | 61,538 |
| $0.5 | 400,000 | 200,000 | 307,692 |
| $1.00 | 800,000 | 400,000 | 615,385 |
| $5.00 | 4M | 2M | 3.08M |
| $10.00 | 8M | 4M | 6.15M |
| $20.00 | 16M | 8M | 12.3M |
| $25.00 | 20M | 10M | 15.4M |
| $30.00 | 24M | 12M | 18.5M |
| $50.00 | 40M | 20M | 30.8M |
| $100.00 | 80M | 40M | 61.5M |
| $250.00 | 200M | 100M | 153.8M |
| $500.00 | 400M | 200M | 307.7M |
| $1,000.00 | 800M | 400M | 615.4M |
| $5,000.00 | 4B | 2B | 3.08B |
| $10,000.00 | 8B | 4B | 6.15B |
At these rates
- A workload with 70% input and 30% output costs $1.625 per 1 million total tokens and $162.50 per 100 million.
- At the same token count, output costs 2 times the input rate. Response length therefore deserves its own budget limit.
- Filling the 1,000,000-token context window with input alone would cost about $1.25, before any output.
- Cached input is $0.2 per million, 84% below standard input when the workload meets the provider’s cache rules.
Short-context (<200k prompt) rates shown. Prompts ≥200k bill $2.50 input / $0.40 cached / $5 output per 1M. The non-reasoning and multi-agent 4.20 SKUs share this list.
These figures use public list prices. Cache eligibility, batch or priority modes, long-context surcharges, discounts, and regional billing can change the invoice.