Grok 4.5 vs o3 Mini High
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Grok 4.5 and o3 Mini High.
Grok 4.5
Grok 4.5 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
o3 Mini High
OpenAI o3-mini-high is the same model as [o3-mini](/openai/o3-mini) with reasoning_effort set to high. o3-mini is a cost-efficient language model optimized for STEM reasoning tasks, particularly excelling in science, mathematics, and...
Technical Specifications
| Specification | Grok 4.5 | o3 Mini High |
|---|---|---|
| Provider | xAI | OpenAI |
| Context Window | 500,000 tokens | 200,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2026-07-08 | 2025-02-12 |
API Pricing Comparison
Input Price per Million Tokens
Grok 4.5
$2.00
o3 Mini High
$1.10
Output Price per Million Tokens
Grok 4.5
$6.00
o3 Mini High
$4.40
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Grok 4.5 Quirks & Gotchas
No developer gotchas reported.
o3 Mini High Quirks & Gotchas
No developer gotchas reported.