gpt-oss-120b vs Kimi K2.5 (Comparative Analysis)
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Comparative Analysis: gpt-oss-120b vs. Kimi K2.5
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Overview
gpt-oss-120b was released 5 months before Kimi K2.5.
 gpt-oss-120b |  Kimi K2.5 | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | MoonshotAI |
Input Context Window Maximum input tokens this model can process at once | 131.1K tokens | 262.1K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 131.1K tokens | 262.1K tokens |
Release Date When this model first became publicly available | August 5, 2025 11 months ago August 5th, 2025 | January 27, 2026 6 months ago January 27th, 2026 |
Knowledge Cutoff Latest training-data date reported by the provider | June 30, 2024 | Not reported |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
gpt-oss-120b | Kimi K2.5 | |
|---|---|---|
Input Types Supported input formats | 📝Text | 📝Text🖼️Image |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: High, Medium, LowDefault: Medium | Enabled by default |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | Other |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Open Source Model availability | Available on HuggingFace → | Available on HuggingFace → |
Pricing
gpt-oss-120b is roughly 0.07x less expensive compared to Kimi K2.5 for input tokens and roughly 0.06x less expensive for output tokens.
| gpt-oss-120b | Kimi K2.5 | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.04 per million tokens | $0.57 per million tokens |
Output Token Cost Cost per million output tokens | $0.17 per million tokens | $2.85 per million tokens |
Cache Read Cost Cost to reuse cached input tokens | Not specified | $0.10 per million tokens |
Benchmarks
Compare relevant benchmarks between gpt-oss-120b and Kimi K2.5.
| gpt-oss-120b | Kimi K2.5 | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 23.8 (Artificial Analysis index; higher is better) | 35.4 (Artificial Analysis index; higher is better) |
Coding Index Programming performance across independent evaluations | 30.4 (Artificial Analysis index; higher is better) | 46.8 (Artificial Analysis index; higher is better) |
Agentic Index Ability to complete multi-step agentic tasks | 13.2 (Artificial Analysis index; higher is better) | 21.7 (Artificial Analysis index; higher is better) |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,050 Elo (#91 in Game Dev (40.6% win rate)) | 1,275 Elo (#24 in Website (55.5% win rate)) |
At a Glance
Quick overview of what makes gpt-oss-120b and Kimi K2.5 unique.
gpt-oss-120b by OpenAI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 131.1K token context window. Very affordable at $0.04/M input and $0.17/M output tokens. Released August 5th, 2025.Kimi K2.5 by MoonshotAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 262.1K token context window. Reasonably priced at $0.57/M input and $2.85/M output tokens. Released January 27th, 2026.Explore More Comparisons
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