gpt-oss-120b vs Kimi K2 Thinking
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
gpt-oss-120b
OpenAI · Aug 2025
OpenAI's open-weights MoE reasoning model under Apache 2.0 — near o4-mini quality, runnable on a single 80GB GPU.
Kimi K2 Thinking
67.6Moonshot AI · Nov 2025
A trillion-parameter open reasoning agent that can chain 200–300 tool calls — the open-weights agentic standout of late 2025.
The verdict
Kimi K2 Thinking wins 3 of the 3 benchmarks these models share, against 0 for gpt-oss-120b. On price the gap is dramatic: gpt-oss-120b works out roughly 5.4x cheaper per blended million tokens. Kimi K2 Thinking also takes 262K of context versus 131K for gpt-oss-120b.
Benchmark head-to-head 0–3
Specs & pricing
| gpt-oss-120b | Kimi K2 Thinking | |
|---|---|---|
| modhub Index | — | 67.6 |
| Input price / 1M | $0.1 | $0.6 |
| Output price / 1M | $0.5 | $2.5 |
| Context window | 131K | 262K |
| Max output | 131K | — |
| Open weights | yes (Apache 2.0) | yes (Modified MIT) |
| Reasoning model | yes | yes |
| Multimodal input | text | text |
| Knowledge cutoff | Jun 2024 | Apr 2025 |
| Released | Aug 2025 | Nov 2025 |
| Example monthly cost* | $1.75 | $9.75 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, gpt-oss-120b or Kimi K2 Thinking?
- Kimi K2 Thinking wins 3 of the 3 benchmarks these models share, against 0 for gpt-oss-120b. On price the gap is dramatic: gpt-oss-120b works out roughly 5.4x cheaper per blended million tokens. Kimi K2 Thinking also takes 262K of context versus 131K for gpt-oss-120b.
- Which is cheaper, gpt-oss-120b or Kimi K2 Thinking?
- gpt-oss-120b costs $0.1/$0.5 per million input/output tokens, while Kimi K2 Thinking costs $0.6/$2.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $1.75 versus $9.75.
- Which model is better for coding, gpt-oss-120b or Kimi K2 Thinking?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.
More comparisons
gpt-oss-120b vs GPT-5.5Kimi K2 Thinking vs GPT-5.5gpt-oss-120b vs GPT-5.2Kimi K2 Thinking vs GPT-5.2gpt-oss-120b vs GPT-5.1Kimi K2 Thinking vs GPT-5.1gpt-oss-120b vs GPT-5Kimi K2 Thinking vs GPT-5gpt-oss-120b vs GPT-5 miniKimi K2 Thinking vs GPT-5 minigpt-oss-120b vs OpenAI o3Kimi K2 Thinking vs OpenAI o3