LLM Comparison
Grok 4 Fast vs GPT-5.4 Pro
Side-by-side specs, pricing & capabilities · Updated April 2026
Add to comparison
2/6 modelsSame tier:
 GPT-5.4 Pro | ||
|---|---|---|
| Organization |  OpenAI | |
| OpenTools Score | ||
| Family | Grok | GPT |
| Status | Current | Current |
| Release Date | Sep 2025 | Mar 2026 |
| Context Window | 2.0M tokens | 1.1M tokens |
| Input Price | $0.20/M tokens | $30.00/M tokens |
| Output Price | $0.50/M tokens | $180.00/M tokens |
| Pricing Notes | Cache read: $0.0500/M tokens | — |
| Capabilities | textvisioncode | textvisioncode |
| Max Output | 30K tokens | 128K tokens |
| API Identifier | x-ai/grok-4-fast | openai/gpt-5.4-pro |
| View Grok 4 Fast | View GPT-5.4 Pro |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Grok 4 FastCheapest | $0.20 | $0.25 | $0.45 | — |
| GPT-5.4 Pro | $30.00 | $90.00 | $120.00 | +26567% |
xAI
Grok 4 Fast
Grok 4 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.
OpenAI
GPT-5.4 Pro
GPT-5.4 Pro is a multimodal llm from OpenAI. Supports up to 1,050,000 token context window. Available from $30.00/M input tokens.
More Comparisons
Looking for more AI models?
Browse All LLMs