GPT-5.1-Codex-Mini vs Kimi K2 0905 (Comparative Analysis)
Loading comparison form...
Comparative Analysis: GPT-5.1-Codex-Mini vs. Kimi K2 0905
Want to try out these models side by side?Try Magica for free
Overview
Kimi K2 0905 was released 2 months before GPT-5.1-Codex-Mini.
 GPT-5.1-Codex-Mini |  Kimi K2 0905 | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | MoonshotAI |
Input Context Window Maximum input tokens this model can process at once | 400K tokens | 262.1K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens | 100.4K tokens |
Release Date When this model first became publicly available | November 13, 2025 9 months ago November 13th, 2025 | September 4, 2025 11 months ago September 4th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | December 31, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-5.1-Codex-Mini | Kimi K2 0905 | |
|---|---|---|
Input Types Supported input formats | 🖼️Image📝Text | 📝Text |
Reasoning Controls Defaults and configurable reasoning effort | OptionalEffort: High, Medium, LowDefault: Medium | Not reported |
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 OutputReasoning ModeContent Moderation |
Open Source Model availability | Proprietary | Available on HuggingFace → |
Pricing
GPT-5.1-Codex-Mini is roughly 0.4x less expensive compared to Kimi K2 0905 for input tokens and roughly 0.8x less expensive for output tokens.
| GPT-5.1-Codex-Mini | Kimi K2 0905 | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.25 per million tokens | $0.60 per million tokens |
Output Token Cost Cost per million output tokens | $2.00 per million tokens | $2.50 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | Not specified |
Cache Read Cost Cost to reuse cached input tokens | $0.03 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between GPT-5.1-Codex-Mini and Kimi K2 0905.
| GPT-5.1-Codex-Mini | Kimi K2 0905 | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,143 Elo (#46 in Asciiart (43.0% win rate)) | 1,129 Elo (#85 in Website (48.3% win rate)) |
At a Glance
Quick overview of what makes GPT-5.1-Codex-Mini and Kimi K2 0905 unique.
GPT-5.1-Codex-Mini by OpenAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 400K token context window. Reasonably priced at $0.25/M input and $2.00/M output tokens. Released November 13th, 2025.Kimi K2 0905 by MoonshotAI can use external tools and APIs, generates structured data. It can handle standard conversations with its 262.1K token context window. Reasonably priced at $0.60/M input and $2.50/M output tokens. Released September 4th, 2025.Explore More Comparisons
Compare your models with top performers across different categories
Compare GPT-5.1-Codex-Mini with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
🌐Translation
Multilingual translation tasks
Compare Kimi K2 0905 with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
🌐Translation
Multilingual translation tasks
