Grok 4 vs GPT 5.4
GPT 5.4 is 1.2× cheaper on input tokens than Grok 4. GPT 5.4 has a longer context window (1M vs 256K). Both models are accessible via the haimaker.ai OpenAI-compatible API at https://api.haimaker.ai/v1.
Grok 4
xai/grok-4
Chat
Function CallingWeb Search
GPT 5.4
openai/gpt-5.4
Chat
Function CallingVisionReasoning
Side-by-side specifications
| Spec | Grok 4 | GPT 5.4 |
|---|---|---|
| Provider | Xai | OpenAI |
| Full ID | xai/grok-4 | openai/gpt-5.4 |
| Mode | chat | chat |
| Parameters | N/A | N/A |
| Context window | 256K | 1M |
| Max output | 256K | 128K |
| Input price (per 1M) | $3.00 | $2.50 |
| Output price (per 1M) | $15.00 | $15.00 |
| License | N/A | N/A |
| Architecture | N/A | N/A |
Feature support
| Feature | Grok 4 | GPT 5.4 |
|---|---|---|
| Function Calling | ✓ Supported | ✓ Supported |
| Reasoning | — | ✓ Supported |
| Vision | — | ✓ Supported |
| Web Search | ✓ Supported | — |
Frequently asked questions
Which is cheaper, Grok 4 or GPT 5.4?
GPT 5.4 is cheaper at $2.50 per 1M input tokens vs $3.00 for Grok 4.
Which has the larger context window, Grok 4 or GPT 5.4?
GPT 5.4 accepts up to 1M input tokens vs 256K for Grok 4.
Can I use both Grok 4 and GPT 5.4 via the same API?
Yes. haimaker.ai exposes both xai/grok-4 and openai/gpt-5.4 on the same OpenAI-compatible endpoint at https://api.haimaker.ai/v1, so you can switch between them by changing the model parameter in your request.
Try Grok 4 or GPT 5.4 via the haimaker API
One OpenAI-compatible endpoint. Switch between them by changing the model parameter.