KAT-Coder-Air V2.5 is $0.35 cheaper per 1M input tokens (70% lower; 3.33x difference).
API cost decision in 10 seconds
NewSeed 2.1 Turbo vs KAT-Coder-Air V2.5
Pick KAT-Coder-Air V2.5 for lower cost; pick Seed 2.1 Turbo 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 KAT-Coder-Air V2.5 for lower cost; pick Seed 2.1 Turbo only if the larger context window matters more.
On the standard 1M input plus 500K output workload, KAT-Coder-Air V2.5 is estimated at $0.45 vs $1.75 for Seed 2.1 Turbo, saving $1.3 (74.3% lower).
Cost-first pickKAT-Coder-Air V2.5
Context-first pickSeed 2.1 Turbo
Sample savings$1.374.3%
10x traffic gap$13
Seed 2.1 Turbo has more context, but KAT-Coder-Air V2.5 saves $1.3 on the standard workload. At 10x that traffic, the same price gap is about $13. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
KAT-Coder-Air V2.5 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Seed 2.1 Turbo | KAT-Coder-Air V2.5 |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | KAT-Coder-Air V2.5 | $3.75 | $1.05 |
| Balanced workload | 1M input + 1M output | KAT-Coder-Air V2.5 | $3 | $0.75 |
| Output-heavy chatbot | 1M input + 5M output | KAT-Coder-Air V2.5 | $13 | $3.15 |
KAT-Coder-Air V2.5 is $1.9 cheaper per 1M output tokens (76% lower; 4.17x difference).
Seed 2.1 Turbo has 6.14K more context (1.02x larger).
KAT-Coder-Air V2.5 is $1.3 cheaper on the standard workload (74.3% 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
KAT-Coder-Air V2.5 has the lower input price; KAT-Coder-Air V2.5 has the lower output price; Seed 2.1 Turbo offers the larger context window. For the 1M input plus 500K output sample, KAT-Coder-Air V2.5 is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $1.75 for Seed 2.1 Turbo and $0.45 for KAT-Coder-Air V2.5.
Choose Seed 2.1 Turbo when you care most about larger context window.
Choose KAT-Coder-Air V2.5 when you care most about lower input-token price, and lower output-token price.
- On the standard 1M input plus 500K output workload, KAT-Coder-Air V2.5 is estimated at $0.45 vs $1.75 for Seed 2.1 Turbo, saving $1.3 (74.3% lower).
- KAT-Coder-Air V2.5 is $1.3 cheaper on the standard workload (74.3% lower).
- KAT-Coder-Air V2.5 is $0.35 cheaper per 1M input tokens (70% lower; 3.33x difference).
- KAT-Coder-Air V2.5 is $1.9 cheaper per 1M output tokens (76% lower; 4.17x difference).
- Seed 2.1 Turbo has 6.14K more context (1.02x larger).
| Feature | NewSeed 2.1 Turbo (ByteDance Seed) | KAT-Coder-Air V2.5 (Kwaipilot) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.5 | $0.15 |
| Completion Price per 1M tokens | $2.5 | $0.6 |
| Sample Workload Cost 1M input + 500K output | $1.75 | $0.45 |
| Context Window | 262.14K | 256K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | KAT-Coder-Air V2.5 | On the standard 1M input plus 500K output workload, KAT-Coder-Air V2.5 is estimated at $0.45 vs $1.75 for Seed 2.1 Turbo, saving $1.3 (74.3% lower). |
| High-volume input processing | KAT-Coder-Air V2.5 | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | KAT-Coder-Air V2.5 | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Seed 2.1 Turbo | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Seed 1.6 Flash can replace Seed 2.1 Turbo when lower sample workload cost matters most: $0.22.
- Seed-2.0-Mini can replace Seed 2.1 Turbo when lower sample workload cost matters most: $0.3.
- Seed-2.0-Lite can replace Seed 2.1 Turbo when lower sample workload cost matters most: $1.25.
- Seed 1.6 can replace Seed 2.1 Turbo when lower sample workload cost matters most: $1.25.
- 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.
- Llama 4 Scout offers 1.31M context with $0.25 sample workload cost.
- MiMo-V2.5 offers 1.05M context with $0.28 sample workload cost.
- DeepSeek V4 Flash 0731 · DeepSeek · #1
- MiMo-V2.5 · Xiaomi · #2
- Hy3 · Tencent · #3
- Ox Alpha · stealth · #4
Cheaper alternatives
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