Kimi K2 0905 is the September update of [Kimi K2 0711](moonshotai/kimi-k2). It is a large-scale Mixture-of-Experts (MoE) language model developed by Moonshot AI, featuring 1 trillion total parameters with 32...
Model details →MoonshotAI: Kimi K2 0905 vs OpenAI: GPT-5 (batch)
OpenAI: GPT-5 (batch) wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5 is OpenAI’s most advanced model, offering major improvements in reasoning, code quality, and user experience. It is optimized for complex tasks that require step-by-step reasoning, instruction following, and accuracy...
Model details →Side-by-side comparison
| Capability | MoonshotAI: Kimi K2 0905 | OpenAI: GPT-5 (batch) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 262K | 400K | 🏆 OpenAI: GPT-5 (batch) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.60 | $0.63 | 🏆 MoonshotAI: Kimi K2 0905 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $2.50 | $5.00 | 🏆 MoonshotAI: Kimi K2 0905 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | — | Yes | 🏆 OpenAI: GPT-5 (batch) |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | — | Yes | 🏆 OpenAI: GPT-5 (batch) |
Frequently asked questions
Is MoonshotAI: Kimi K2 0905 better than OpenAI: GPT-5 (batch)?
OpenAI: GPT-5 (batch) 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 0905 and OpenAI: GPT-5 (batch)?
Input: $0.60 vs $0.63 per 1M tokens. Output: $2.50 vs $5.00 per 1M tokens.
What context windows do MoonshotAI: Kimi K2 0905 and OpenAI: GPT-5 (batch) support?
MoonshotAI: Kimi K2 0905 supports up to 262K tokens. OpenAI: GPT-5 (batch) supports up to 400K tokens.
Do both MoonshotAI: Kimi K2 0905 and OpenAI: GPT-5 (batch) support tool calling?
MoonshotAI: Kimi K2 0905: yes. OpenAI: GPT-5 (batch): yes.