API cost decision in 10 seconds
NewGPT-6.1 Terra Pro vs New🔥Kimi K3.1 Pro
Pick GPT-6.1 Terra Pro when budget and context both matter.
Pricing data updated:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick GPT-6.1 Terra Pro when budget and context both matter.
On the standard 1M input plus 500K output workload, GPT-6.1 Terra Pro is estimated at $3.5 vs $7 for Kimi K3.1 Pro, saving $3.5 (50% lower).
Cost-first pickGPT-6.1 Terra Pro
Context-first pickGPT-6.1 Terra Pro
Sample savings$3.550%
10x traffic gap$35
GPT-6.1 Terra Pro is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $35. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
GPT-6.1 Terra Pro stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GPT-6.1 Terra Pro | Kimi K3.1 Pro |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | GPT-6.1 Terra Pro | $7.5 | $15 |
| Balanced workload | 1M input + 1M output | GPT-6.1 Terra Pro | $6 | $12 |
| Output-heavy chatbot | 1M input + 5M output | GPT-6.1 Terra Pro | $26 | $52 |
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
GPT-6.1 Terra Pro has the lower input price, GPT-6.1 Terra Pro has the lower output price, and GPT-6.1 Terra Pro offers the larger context window.
For a 1M input token plus 500K output token workload, the estimated API cost is $3.5 for GPT-6.1 Terra Pro and $7 for Kimi K3.1 Pro.
Choose GPT-6.1 Terra Pro when you care most about lower input-token price, lower output-token price, and larger context window.
Choose Kimi K3.1 Pro when its provider, model quality, latency, or availability is more important than the numeric price/context winner.
| Feature | NewGPT-6.1 Terra Pro (OpenAI) | New🔥Kimi K3.1 Pro (MoonshotAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $1 | $2 |
| Completion Price per 1M tokens | $5 | $10 |
| Sample Workload Cost 1M input + 500K output | $3.5 | $7 |
| Context Window | 1.05M | 1.05M |
| Release Date | 2026-10-26 | 2026-10-23 |
| Popularity | #1 |
GPT-6.1 Terra Pro is the same underlying model as [GPT-6.1 Terra](https://openrouter.ai/openai/gpt-6.1-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model and a post-trained successor to Kimi K3, with a 1M-token context window. It is built for long-horizon coding, 3D...
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | GPT-6.1 Terra Pro | On the standard 1M input plus 500K output workload, GPT-6.1 Terra Pro is estimated at $3.5 vs $7 for Kimi K3.1 Pro, saving $3.5 (50% lower). |
| High-volume input processing | GPT-6.1 Terra Pro | Lower prompt-token price matters most when prompts or retrieved passages dominate the bill. |
| Long responses and chatbots | GPT-6.1 Terra Pro | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-6.1 Terra Pro | A larger context window leaves more room for retrieved passages and source files. |