LLM Comparison
Grok 4 Fast vs GPT-5.4 Mini
Side-by-side specs, pricing & capabilities · Updated April 2026
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2/6 modelsSame tier:
 GPT-5.4 Mini | ||
|---|---|---|
| Organization |  OpenAI | |
| OpenTools Score | 64 24.5 | |
| Family | Grok | GPT |
| Status | Current | Current |
| Release Date | Sep 2025 | Mar 2026 |
| Context Window | 2.0M tokens | 400K tokens |
| Input Price | $0.20/M tokens | $0.75/M tokens |
| Output Price | $0.50/M tokens | $4.50/M tokens |
| Pricing Notes | Cache read: $0.0500/M tokens | Cache read: $0.0750/M tokens |
| Capabilities | textvisioncode | textvisioncode |
| Max Output | 30K tokens | 128K tokens |
| API Identifier | x-ai/grok-4-fast | openai/gpt-5.4-mini |
| Benchmarks | ||
| GPQA Diamond | — | 88openai |
| SWE-bench Pro | — | 54.4openai |
| OSWorld-Verified | — | 72.1openai |
| Terminal-Bench 2.0 | — | 60openai |
| MMMU-Pro | — | 76.6openai |
| View Grok 4 Fast | View GPT-5.4 Mini | |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Grok 4 FastCheapest | $0.20 | $0.25 | $0.45 | — |
| GPT-5.4 Mini | $0.75 | $2.25 | $3.00 | +567% |
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 Mini
GPT-5.4 Mini is a multimodal llm from OpenAI. Supports up to 400,000 token context window. Available from $0.75/M input tokens.
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