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 billion active per forward pass.…
Model details →MoonshotAI: Kimi K2 0905 vs OpenAI: gpt-oss-120b
OpenAI: gpt-oss-120b wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimize…
Model details →Side-by-side comparison
| Capability | MoonshotAI: Kimi K2 0905 | OpenAI: gpt-oss-120b | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 131K | 131K | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.40 | $0.04 | 🏆 OpenAI: gpt-oss-120b |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $2.00 | $0.19 | 🏆 OpenAI: gpt-oss-120b |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | — | — | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | — | Yes | 🏆 OpenAI: gpt-oss-120b |
Frequently asked questions
Is MoonshotAI: Kimi K2 0905 better than OpenAI: gpt-oss-120b?
OpenAI: gpt-oss-120b 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-oss-120b?
Input: $0.40 vs $0.04 per 1M tokens. Output: $2.00 vs $0.19 per 1M tokens.
What context windows do MoonshotAI: Kimi K2 0905 and OpenAI: gpt-oss-120b support?
MoonshotAI: Kimi K2 0905 supports up to 131K tokens. OpenAI: gpt-oss-120b supports up to 131K tokens.
Do both MoonshotAI: Kimi K2 0905 and OpenAI: gpt-oss-120b support tool calling?
MoonshotAI: Kimi K2 0905: yes. OpenAI: gpt-oss-120b: yes.