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Seedream 4.0 vs GPT Image 1.5

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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Seedream 4.0
bytedance/seedream-4.0
GPT Image 1.5
openai/gpt-image-1.5
Provider
ByteDance
OpenAI
Family
Seedream
Modality
image
image
Context window
Max output
Released
2026-05-22
2026-05-22
License
Proprietary
Proprietary
Per image
$0.030 /img
$0.0000 /img
Tools
Streaming
Vision
JSON mode
Reasoning
Prompt caching
Batch API
Try it
View model →
View model →
Seedream 4.0
bytedance/seedream-4.0
Full spec →

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.

Strengths
  • Text-to-image generation
  • Creative control
Use cases
Marketing assetsProduct mockupsConcept art
GPT Image 1.5
openai/gpt-image-1.5
Full spec →

OpenAI's image generation model that creates and edits images from text prompts, supporting multiple quality levels and output sizes.

Strengths
  • Text-to-image generation
  • Creative control
Use cases
Marketing assetsProduct mockupsConcept art

Compare with another

Imagen 4 vs GPT Image 1.5
google/imagen-4 · openai/gpt-image-1.5
Nano Banana Pro vs GPT Image 1.5
google/nano-banana-pro · openai/gpt-image-1.5
SWITCH BETWEEN THEM

One key, all 2, one line different.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

# Seedream 4.0
client.chat.completions.create(
    model="bytedance/seedream-4.0",
    messages=[{"role":"user","content":"hello"}],
)

# GPT Image 1.5
client.chat.completions.create(
    model="openai/gpt-image-1.5",
    messages=[{"role":"user","content":"hello"}],
)
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