Last verified 2025-09-22 (left) · 2025-09-22 (right)
Grok 4 vs o3 — Pricing & Capability Comparison
Grok 4 charges $3.00 per million input tokens and $15.00 per million output tokens. o3 comes in at $2.00 / $8.00. Context windows span 256K vs 200K tokens respectively.
TL;DR — Quick Comparison
- ✓o3 is cheaper overall: $10.00 per 1M tokens (in+out) vs $18.00 for Grok 4 — saves $8.00 per 1M tokens
- ✓Input pricing: Grok 4 $3.00/1M vs o3 $2.00/1M
- ✓Output pricing: Grok 4 $15.00/1M vs o3 $8.00/1M
- ✓Context window: Grok 4 offers more (256K vs 200K)
- ✓Use our calculator below to estimate costs for your specific usage pattern
Input price (per 1M)
Grok 4
$3.00
o3
$2.00
o3 leads here
Output price (per 1M)
Grok 4
$15.00
o3
$8.00
o3 leads here
Context window
Grok 4
256,000 tokens
o3
200,000 tokens
Grok 4 leads here
Cached input
Grok 4
$0.750
o3
Not published
Grok 4 leads here
Cost comparison for 10K-token workloads
Side-by-side pricing for identical workloads (10,000 total tokens per request) across different distributions.
| Scenario | Grok 4 | o3 | Grok 4 cached |
|---|---|---|---|
Balanced conversation 50% input · 50% output | $0.0900 | $0.0500 | $0.0788 |
Input-heavy workflow 80% input · 20% output | $0.0540 | $0.0320 | $0.0360 |
Generation heavy 30% input · 70% output | $0.114 | $0.0620 | $0.107 |
Cached system prompt 90% cached input · 10% fresh output | $0.0420 | $0.0260 | $0.0217 |
Frequently asked questions
Which is cheaper: Grok 4 or o3?
o3 is cheaper for input tokens at $2.00 per 1M tokens compared to $3.00. For output, o3 costs $8.00 per 1M tokens versus $15.00 for Grok 4.
What is the cost per 1M tokens for Grok 4?
Grok 4 pricing: $3.00 per 1M input tokens and $15.00 per 1M output tokens. Context window: 256,000 tokens.
What is the cost per 1M tokens for o3?
o3 pricing: $2.00 per 1M input tokens and $8.00 per 1M output tokens. Context window: 200,000 tokens.
How much does it cost per 1K tokens?
Per 1K tokens: Grok 4 costs $0.0030 input / $0.0150 output. o3 costs $0.0020 input / $0.0080 output. This is useful for calculating small-scale usage costs.
Which model supports a larger context window?
Grok 4 offers 256,000 tokens (256K) versus 200K for o3.
What is the estimated monthly cost for typical usage?
For a typical workload of 10M input + 2M output tokens per month: Grok 4 would cost approximately $60.00, while o3 would cost $36.00. o3 is more economical for this usage pattern.
Do these models support prompt caching?
Grok 4 supports prompt caching at $0.750 per 1M cached tokens, reducing costs for repeated context by up to 75%. o3 does not publish cached pricing.
Which model is best for my use case?
Choose o3 for cost-sensitive applications with high input volume. Choose Grok 4 if you need 256K context for long documents or conversations. Consider prompt caching if you have repeated context. Use our token calculator to model your specific usage pattern.