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o3 vs Grok 4
A detailed comparison of o3 (OpenAI) and Grok 4 (xAI) across pricing, performance, and features.
Pricing Comparison
| Metric | o3 | Grok 4 | Difference |
|---|---|---|---|
| Input / 1M tokens | $0.40 | $3.00 | +650% |
| Output / 1M tokens | $1.60 | $15.00 | +838% |
| Context window | 200K | 128K | — |
| Max output | 100K | 16.384K | — |
Benchmark Comparison
| Benchmark | o3 | Grok 4 |
|---|---|---|
| MMLU-Pro | 87% | 86% |
| HumanEval | 94.5% | 93% |
| GPQA | 79.2% | 72% |
Capabilities
| Capability | o3 | Grok 4 |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
| web-search | ✗ | ✓ |
o3 Strengths
- ✓Recently repriced — now very cheap
- ✓Excellent logical reasoning
- ✓200K context window
o3 Weaknesses
- ✗Slower due to reasoning overhead
- ✗Overkill for simple tasks
Grok 4 Strengths
- ✓Built-in web search and real-time data
- ✓Strong reasoning
- ✓$25 free credits for new users
Grok 4 Weaknesses
- ✗Premium pricing for its benchmark tier
- ✗Additional charges for tool invocations ($2.50-$5/1K calls)
- ✗Smaller ecosystem than OpenAI/Anthropic
Quick Verdict
Best value: o3 is the more affordable option at $0.4/$1.6 per 1M tokens.
Higher benchmarks: o3 scores higher on average across available benchmarks (86.9% avg).
Larger context: o3 supports 200K tokens.
Choose o3 if cost matters most. Choose Grok 4 if you need the best possible quality for complex tasks.