GPT-5.4 mini vs Grok 4.5
Detailed pricing comparison and cost analysis.
Updated September 2026
Cost Simulator
| Feature | GPT-5.4 mini | Grok 4.5 |
|---|---|---|
| Provider | OpenAI | xAI |
| Input Price (1M) | $0.75 | $2.00 |
| Output Price (1M) | $4.50 | $6.00 |
| Context Window | 400,000 | 500,000 |
Verdict
GPT-5.4 mini costs $0.75 per 1M input tokens and $4.50 per 1M output tokens. Grok 4.5 costs $2.00 per 1M input tokens and $6.00 per 1M output tokens. GPT-5.4 mini is 63% cheaper on input tokens than Grok 4.5. For output tokens, GPT-5.4 mini is the more affordable option at $4.50/1M vs $6.00.
On context window, Grok 4.5 supports 500,000 tokens — meaning it can fit more conversation history, documents, or code in a single request. This matters for RAG pipelines, long document analysis, and agentic workflows where context builds up over many turns.
When to choose GPT-5.4 mini
- ✓ You need the lowest input token cost ($ 0.75/1M)
- ✓ Your workload is output-heavy — GPT-5.4 mini generates text cheaper
- ✓ You are already integrated with OpenAI
When to choose Grok 4.5
- ✓ You need a larger context window (500,000 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 GPT-5.4 mini cheaper than Grok 4.5? ▼
GPT-5.4 mini is cheaper on input tokens at $0.75/1M vs $2.00/1M for Grok 4.5 — a 63% saving.
What is the context window of GPT-5.4 mini vs Grok 4.5? ▼
GPT-5.4 mini has a 400,000-token context window. Grok 4.5 has a 500,000-token context window. Grok 4.5 supports the larger context, suitable for longer documents and agentic workflows.
Which model is better: GPT-5.4 mini or Grok 4.5? ▼
The best choice depends on your use case. For cost efficiency on input tokens, GPT-5.4 mini is the cheaper option. For maximum context length, Grok 4.5 supports 500,000 tokens. Use the comparison table above to find the right fit for your workload.