LLM Comparison
Grok 4.1 Fast vs GPT-5.4 Nano
Side-by-side specs, pricing & capabilities · Updated April 2026
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2/6 modelsSame tier:
 GPT-5.4 Nano | ||
|---|---|---|
| Organization |  OpenAI | |
| OpenTools Score | ||
| Family | Grok | GPT |
| Status | Current | Current |
| Release Date | Nov 2025 | Mar 2026 |
| Context Window | 2.0M tokens | 400K tokens |
| Input Price | $0.20/M tokens | $0.20/M tokens |
| Output Price | $0.50/M tokens | $1.25/M tokens |
| Pricing Notes | Cache read: $0.0500/M tokens | Cache read: $0.0200/M tokens |
| Capabilities | textvisioncode | textvisioncode |
| Max Output | 30K tokens | 128K tokens |
| API Identifier | x-ai/grok-4.1-fast | openai/gpt-5.4-nano |
| View Grok 4.1 Fast | View GPT-5.4 Nano |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Grok 4.1 FastCheapest | $0.20 | $0.25 | $0.45 | — |
| GPT-5.4 Nano | $0.20 | $0.63 | $0.83 | +83% |
xAI
Grok 4.1 Fast
Grok 4.1 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 Nano
GPT-5.4 Nano is a multimodal llm from OpenAI. Supports up to 400,000 token context window. Available from $0.20/M input tokens.
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