Pricing, context window, capabilities, and release date — pulled from each provider's public docs. Both are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
Both models stream in parallel through your own AIgateway key. Tokens, latency, and cost update as they arrive.
| GPT-5.4 openai/gpt-5.4 | Grok 4 xai/grok-4 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Family | GPT-5 | Grok 4 |
| Modality | text | text |
| Context window | 128,000 tok | 256,000 tok |
| Max output | 16,384 tok | 16,384 tok |
| Released | 2026-04-08 | 2025-07-09 |
| Input price | $2.50 /1M | $5.00 /1M |
| Output price | $15.00 /1M | $15.00 /1M |
| Cache read | $0.250 /1M | — |
| Tools | yes | yes |
| Streaming | yes | yes |
| Vision | yes | yes |
| JSON mode | yes | yes |
| Reasoning | yes | yes |
| Prompt caching | yes | — |
GPT-5.4 is OpenAI's flagship model with strong coding, reasoning, and multimodal capabilities.
xAI Grok 4 — frontier reasoning, tool use, long context.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Try GPT-5.4
client.chat.completions.create(
model="openai/gpt-5.4",
messages=[{"role":"user","content":"hello"}],
)
# Try Grok 4 — same client, same key
client.chat.completions.create(
model="xai/grok-4",
messages=[{"role":"user","content":"hello"}],
)