Kimi K2.5 is Moonshot AI's native multimodal model, delivering state-of-the-art visual coding capability and a self-directed agent swarm paradigm. Built on Kimi K2 with continued pretraining over approximately 15T mixed visual and text toke…
Model details →MoonshotAI: Kimi K2.5 vs OpenAI: GPT-5 Nano
OpenAI: GPT-5 Nano wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger counterparts, it retains key …
Model details →Side-by-side comparison
| Capability | MoonshotAI: Kimi K2.5 | OpenAI: GPT-5 Nano | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 262K | 400K | 🏆 OpenAI: GPT-5 Nano |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.42 | $0.05 | 🏆 OpenAI: GPT-5 Nano |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $2.20 | $0.40 | 🏆 OpenAI: GPT-5 Nano |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is MoonshotAI: Kimi K2.5 better than OpenAI: GPT-5 Nano?
OpenAI: GPT-5 Nano wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between MoonshotAI: Kimi K2.5 and OpenAI: GPT-5 Nano?
Input: $0.42 vs $0.05 per 1M tokens. Output: $2.20 vs $0.40 per 1M tokens.
What context windows do MoonshotAI: Kimi K2.5 and OpenAI: GPT-5 Nano support?
MoonshotAI: Kimi K2.5 supports up to 262K tokens. OpenAI: GPT-5 Nano supports up to 400K tokens.
Do both MoonshotAI: Kimi K2.5 and OpenAI: GPT-5 Nano support tool calling?
MoonshotAI: Kimi K2.5: yes. OpenAI: GPT-5 Nano: yes.