o3-mini vs Grok 4
Detailed pricing comparison and cost analysis.
Updated September 2026
Cost Simulator
| Feature | o3-mini | Grok 4 |
|---|---|---|
| Provider | OpenAI | xAI |
| Input Price (1M) | $1.10 | $3.00 |
| Output Price (1M) | $4.40 | $15.00 |
| Context Window | 200,000 | 256,000 |
Verdict
o3-mini costs $1.10 per 1M input tokens and $4.40 per 1M output tokens. Grok 4 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens. o3-mini is 63% cheaper on input tokens than Grok 4. For output tokens, o3-mini is the more affordable option at $4.40/1M vs $15.00.
On context window, Grok 4 supports 256,000 tokens — meaning it can fit more conversation history, documents, or code in a single request. This matters for RAG pipelines, long document analysis, and agentic workflows where context builds up over many turns.
When to choose o3-mini
- ✓ You need the lowest input token cost ($ 1.10/1M)
- ✓ Your workload is output-heavy — o3-mini generates text cheaper
- ✓ You are already integrated with OpenAI
When to choose Grok 4
- ✓ You need a larger context window (256,000 tokens)
- ✓ You are already integrated with xAI
Use the calculator above to simulate your specific workload and find the exact break-even point. For most applications, the cheapest model is the one that minimises your total monthly bill given your input-to-output token ratio.
Frequently Asked Questions
Is o3-mini cheaper than Grok 4? ▼
o3-mini is cheaper on input tokens at $1.10/1M vs $3.00/1M for Grok 4 — a 63% saving.
What is the context window of o3-mini vs Grok 4? ▼
o3-mini has a 200,000-token context window. Grok 4 has a 256,000-token context window. Grok 4 supports the larger context, suitable for longer documents and agentic workflows.
Which model is better: o3-mini or Grok 4? ▼
The best choice depends on your use case. For cost efficiency on input tokens, o3-mini is the cheaper option. For maximum context length, Grok 4 supports 256,000 tokens. Use the comparison table above to find the right fit for your workload.