MoonshotAI Kimi Latest is $0.52 cheaper per 1M input tokens (41.6% lower; 1.71x difference).
API cost decision in 10 seconds
NewMoonshotAI Kimi Latest vs GPT-5.1
Pick MoonshotAI Kimi Latest for lower cost; pick GPT-5.1 only if the larger context window matters more.
Pricing data updated:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick MoonshotAI Kimi Latest for lower cost; pick GPT-5.1 only if the larger context window matters more.
On the standard 1M input plus 500K output workload, MoonshotAI Kimi Latest is estimated at $2.48 vs $6.25 for GPT-5.1, saving $3.77 (60.4% lower).
Cost-first pickMoonshotAI Kimi Latest
Context-first pickGPT-5.1
Sample savings$3.7760.4%
10x traffic gap$37.75
GPT-5.1 has more context, but MoonshotAI Kimi Latest saves $3.77 on the standard workload. At 10x that traffic, the same price gap is about $37.75. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
MoonshotAI Kimi Latest stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | MoonshotAI Kimi Latest | GPT-5.1 |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | MoonshotAI Kimi Latest | $5.39 | $11.25 |
| Balanced workload | 1M input + 1M output | MoonshotAI Kimi Latest | $4.22 | $11.25 |
| Output-heavy chatbot | 1M input + 5M output | MoonshotAI Kimi Latest | $18.18 | $51.25 |
MoonshotAI Kimi Latest is $6.51 cheaper per 1M output tokens (65.1% lower; 2.87x difference).
GPT-5.1 has 137.86K more context (1.53x larger).
MoonshotAI Kimi Latest is $3.77 cheaper on the standard workload (60.4% 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
MoonshotAI Kimi Latest has the lower input price; MoonshotAI Kimi Latest has the lower output price; GPT-5.1 offers the larger context window. For the 1M input plus 500K output sample, MoonshotAI Kimi Latest is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $2.48 for MoonshotAI Kimi Latest and $6.25 for GPT-5.1.
Choose MoonshotAI Kimi Latest when you care most about lower input-token price, and lower output-token price.
Choose GPT-5.1 when you care most about larger context window.
- On the standard 1M input plus 500K output workload, MoonshotAI Kimi Latest is estimated at $2.48 vs $6.25 for GPT-5.1, saving $3.77 (60.4% lower).
- MoonshotAI Kimi Latest is $3.77 cheaper on the standard workload (60.4% lower).
- MoonshotAI Kimi Latest is $0.52 cheaper per 1M input tokens (41.6% lower; 1.71x difference).
- MoonshotAI Kimi Latest is $6.51 cheaper per 1M output tokens (65.1% lower; 2.87x difference).
- GPT-5.1 has 137.86K more context (1.53x larger).
| Feature | NewMoonshotAI Kimi Latest (MoonshotAI) | GPT-5.1 (OpenAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.73 | $1.25 |
| Completion Price per 1M tokens | $3.49 | $10 |
| Sample Workload Cost 1M input + 500K output | $2.48 | $6.25 |
| Context Window | 262.14K | 400K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | MoonshotAI Kimi Latest | On the standard 1M input plus 500K output workload, MoonshotAI Kimi Latest is estimated at $2.48 vs $6.25 for GPT-5.1, saving $3.77 (60.4% lower). |
| High-volume input processing | MoonshotAI Kimi Latest | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | MoonshotAI Kimi Latest | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.1 | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Kimi K2.5 can replace MoonshotAI Kimi Latest when lower sample workload cost matters most: $1.35.
- Kimi K2 0711 can replace MoonshotAI Kimi Latest when lower sample workload cost matters most: $1.72.
- Kimi K2 Thinking can replace MoonshotAI Kimi Latest when lower sample workload cost matters most: $1.85.
- Kimi K2 0905 can replace MoonshotAI Kimi Latest when lower sample workload cost matters most: $1.85.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- Owl Alpha offers 1.05M context with $0 sample workload cost.
- No popular competitor is currently available.
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GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...