Seed 2.1 Turbo is $0.9 cheaper per 1M input tokens (64.3% lower; 2.8x difference).
API cost decision in 10 seconds
NewGLM 5.3 vs NewSeed 2.1 Turbo
Pick Seed 2.1 Turbo for lower cost; pick GLM 5.3 only if the larger context window matters more.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Seed 2.1 Turbo for lower cost; pick GLM 5.3 only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Seed 2.1 Turbo is estimated at $1.75 vs $3.6 for GLM 5.3, saving $1.85 (51.4% lower).
Cost-first pickSeed 2.1 Turbo
Context-first pickGLM 5.3
Sample savings$1.8551.4%
10x traffic gap$18.5
GLM 5.3 has more context, but Seed 2.1 Turbo saves $1.85 on the standard workload. At 10x that traffic, the same price gap is about $18.5. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Seed 2.1 Turbo stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GLM 5.3 | Seed 2.1 Turbo |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Seed 2.1 Turbo | $9.2 | $3.75 |
| Balanced workload | 1M input + 1M output | Seed 2.1 Turbo | $5.8 | $3 |
| Output-heavy chatbot | 1M input + 5M output | Seed 2.1 Turbo | $23.4 | $13 |
Seed 2.1 Turbo is $1.9 cheaper per 1M output tokens (43.2% lower; 1.76x difference).
GLM 5.3 has 786.43K more context (4x larger).
Seed 2.1 Turbo is $1.85 cheaper on the standard workload (51.4% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
Seed 2.1 Turbo has the lower input price; Seed 2.1 Turbo has the lower output price; GLM 5.3 offers the larger context window. For the 1M input plus 500K output sample, Seed 2.1 Turbo is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $3.6 for GLM 5.3 and $1.75 for Seed 2.1 Turbo.
Choose GLM 5.3 when you care most about larger context window.
Choose Seed 2.1 Turbo when you care most about lower input-token price, and lower output-token price.
- On the standard 1M input plus 500K output workload, Seed 2.1 Turbo is estimated at $1.75 vs $3.6 for GLM 5.3, saving $1.85 (51.4% lower).
- Seed 2.1 Turbo is $1.85 cheaper on the standard workload (51.4% lower).
- Seed 2.1 Turbo is $0.9 cheaper per 1M input tokens (64.3% lower; 2.8x difference).
- Seed 2.1 Turbo is $1.9 cheaper per 1M output tokens (43.2% lower; 1.76x difference).
- GLM 5.3 has 786.43K more context (4x larger).
| Feature | NewGLM 5.3 (Z.ai) | NewSeed 2.1 Turbo (ByteDance Seed) |
|---|---|---|
| Input Price prompt tokens per 1M | $1.4 | $0.5 |
| Completion Price per 1M tokens | $4.4 | $2.5 |
| Sample Workload Cost 1M input + 500K output | $3.6 | $1.75 |
| Context Window | 1.05M | 262.14K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Seed 2.1 Turbo | On the standard 1M input plus 500K output workload, Seed 2.1 Turbo is estimated at $1.75 vs $3.6 for GLM 5.3, saving $1.85 (51.4% lower). |
| High-volume input processing | Seed 2.1 Turbo | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Seed 2.1 Turbo | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GLM 5.3 | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- GLM 5.2 (free) can replace GLM 5.3 when lower sample workload cost matters most: $0.
- GLM 4.5 Air (free) can replace GLM 5.3 when lower sample workload cost matters most: $0.
- GLM 4 32B can replace GLM 5.3 when lower sample workload cost matters most: $0.15.
- GLM 4.7 Flash can replace GLM 5.3 when lower sample workload cost matters most: $0.26.
- Grok 4.20 Multi-Agent offers 2M context with $2.5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- DeepSeek V4 Flash 0731 offers 1.31M context with $0.17 sample workload cost.
- DeepSeek V4 Flash Latest offers 1.31M context with $0.11 sample workload cost.
- DeepSeek V4 Flash 0731 · DeepSeek · #1
- MiMo-V2.5 · Xiaomi · #2
- Hy3 · Tencent · #3
- Ox Alpha · stealth · #4
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