GLM 5.3 vs Seed 2.1 Turbo: side-by-side summary

GLM 5.3 and Seed 2.1 Turbo are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GLM 5.3, from Z.ai, has a 1,048,576-token context window and is priced at $1.40/M tokens input, $4.40/M tokens output on OpenRouter.

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.

Context window

• GLM 5.3: 1,048,576 tokens
• Seed 2.1 Turbo: 262,144 tokens

Price

• GLM 5.3: $1.40/M tokens input, $4.40/M tokens output
• Seed 2.1 Turbo: $0.50/M tokens input, $2.50/M tokens output

Provided by

• GLM 5.3: Z.ai
• Seed 2.1 Turbo: bytedance-seed

• GLM 5.3 model details, providers and pricing
• Seed 2.1 Turbo model details, providers and pricing