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.
| Seedream 4.0 bytedance/seedream-4.0 | GPT Image 1.5 openai/gpt-image-1.5 | |
|---|---|---|
| Provider | ByteDance | OpenAI |
| Family | ||
| Modality | image | image |
| Context window | — | — |
| Max output | — | — |
| Released | 2026-04-08 | 2026-04-14 |
| Input price | $0.030 /img | $5.00 /1M |
| Output price | — | $10.00 /1M |
| Cache read | — | — |
| Tools | — | — |
| Streaming | — | — |
| Vision | — | — |
| JSON mode | — | — |
| Reasoning | — | — |
| Prompt caching | — | — |
Seedream 4.0 is ByteDance's image creation model that combines text-to-image generation and image editing into a single architecture, offering fast, high-resolution output up to 4K.
OpenAI's image generation model that creates and edits images from text prompts, supporting multiple quality levels and output sizes.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Try Seedream 4.0
client.chat.completions.create(
model="bytedance/seedream-4.0",
messages=[{"role":"user","content":"hello"}],
)
# Try GPT Image 1.5 — same client, same key
client.chat.completions.create(
model="openai/gpt-image-1.5",
messages=[{"role":"user","content":"hello"}],
)