Seed 2.1 Turbo vs GPT-5.6 Luna Pro: side-by-side summary

Seed 2.1 Turbo and GPT-5.6 Luna Pro are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Seed 2.1 Turbo, from bytedance-seed, has a 262,144-token context window and is priced at $0.50/M tokens input, $2.50/M tokens output on OpenRouter.

GPT-5.6 Luna Pro, from OpenAI, has a 1,050,000-token context window and is priced at $0.10/M tokens input, $0.60/M tokens output on OpenRouter.

Context window

• Seed 2.1 Turbo: 262,144 tokens
• GPT-5.6 Luna Pro: 1,050,000 tokens

Price

• Seed 2.1 Turbo: $0.50/M tokens input, $2.50/M tokens output
• GPT-5.6 Luna Pro: $0.10/M tokens input, $0.60/M tokens output

Provided by

• Seed 2.1 Turbo: bytedance-seed
• GPT-5.6 Luna Pro: OpenAI

• Seed 2.1 Turbo model details, providers and pricing
• GPT-5.6 Luna Pro model details, providers and pricing