Kimi K2 Thinking is Moonshot AI’s most advanced open reasoning model to date, extending the K2 series into agentic, long-horizon reasoning. Built on the trillion-parameter Mixture-of-Experts (MoE) architecture introduced in Kimi K2, it acti…
Model details →MoonshotAI: Kimi K2 Thinking vs OpenAI: gpt-oss-120b (exacto)
OpenAI: gpt-oss-120b (exacto) wins on 2 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 Thinking | OpenAI: gpt-oss-120b (exacto) | 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. | $0.47 | $0.04 | 🏆 OpenAI: gpt-oss-120b (exacto) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $2.00 | $0.19 | 🏆 OpenAI: gpt-oss-120b (exacto) |
| 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 | Yes | Tie |
Frequently asked questions
Is MoonshotAI: Kimi K2 Thinking better than OpenAI: gpt-oss-120b (exacto)?
OpenAI: gpt-oss-120b (exacto) wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between MoonshotAI: Kimi K2 Thinking and OpenAI: gpt-oss-120b (exacto)?
Input: $0.47 vs $0.04 per 1M tokens. Output: $2.00 vs $0.19 per 1M tokens.
What context windows do MoonshotAI: Kimi K2 Thinking and OpenAI: gpt-oss-120b (exacto) support?
MoonshotAI: Kimi K2 Thinking supports up to 131K tokens. OpenAI: gpt-oss-120b (exacto) supports up to 131K tokens.
Do both MoonshotAI: Kimi K2 Thinking and OpenAI: gpt-oss-120b (exacto) support tool calling?
MoonshotAI: Kimi K2 Thinking: yes. OpenAI: gpt-oss-120b (exacto): yes.