Seed 1.6 Flash vs GPT-5.1 Chat: side-by-side summary

Seed 1.6 Flash 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.

Seed 1.6 Flash, from bytedance-seed, has a 262,144-token context window and is priced at $0.075/M tokens input, $0.30/M tokens output 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

• Seed 1.6 Flash: 262,144 tokens
• GPT-5.1 Chat: 128,000 tokens

Price

• Seed 1.6 Flash: $0.075/M tokens input, $0.30/M tokens output
• GPT-5.1 Chat: Pricing varies by provider

Provided by

• Seed 1.6 Flash: bytedance-seed
• GPT-5.1 Chat: OpenAI

• Seed 1.6 Flash model details, providers and pricing
• GPT-5.1 Chat model details, providers and pricing