Seedream 4.5 vs GPT-5.1 Chat: side-by-side summary

Seedream 4.5 and GPT-5.1 Chat are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Seedream 4.5, from bytedance-seed, has a 4,096-token context window and is priced at $0.04/image on OpenRouter.

GPT-5.1 Chat, from OpenAI, has a 128,000-token context window and is priced by the provider serving it on OpenRouter.

Context window

• Seedream 4.5: 4,096 tokens
• GPT-5.1 Chat: 128,000 tokens

Price

• Seedream 4.5: $0.04/image
• GPT-5.1 Chat: Pricing varies by provider

Provided by

• Seedream 4.5: bytedance-seed
• GPT-5.1 Chat: OpenAI

• Seedream 4.5 model details, providers and pricing
• GPT-5.1 Chat model details, providers and pricing