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 | Flux-2-Klein-9b black-forest-labs/flux-2-klein-9b | |
|---|---|---|
| Provider | OpenAI | Black Forest Labs |
| Family | GPT-5 | Flux |
| Modality | text | image |
| Context window | 128,000 tok | — |
| Max output | 16,384 tok | — |
| Released | 2026-04-08 | 2026-01-14 |
| Input price | $2.50 /1M | $0.040 /img |
| Output price | $15.00 /1M | — |
| Cache read | $0.250 /1M | — |
| Tools | yes | — |
| Streaming | yes | — |
| Vision | yes | — |
| JSON mode | yes | — |
| Reasoning | yes | — |
| Prompt caching | yes | — |
GPT-5.4 is OpenAI's flagship model with strong coding, reasoning, and multimodal capabilities.
FLUX.2 [klein] 9B is a 9 billion parameter model that can generate images from text descriptions and supports multi-reference editing capabilities.
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 Flux-2-Klein-9b — same client, same key
client.chat.completions.create(
model="black-forest-labs/flux-2-klein-9b",
messages=[{"role":"user","content":"hello"}],
)