Gemini 2.5 Flash Lite vs GPT-5.1-Codex-Mini (Comparative Analysis)
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Comparative Analysis: Gemini 2.5 Flash Lite vs. GPT-5.1-Codex-Mini
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Overview
Gemini 2.5 Flash Lite was released 3 months before GPT-5.1-Codex-Mini.
 Gemini 2.5 Flash Lite |  GPT-5.1-Codex-Mini | |
|---|---|---|
Model Provider The organization behind this AI's development | Google | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 65.5K tokens | 100K tokens |
Release Date When this model first became publicly available | July 22, 2025 12 months ago July 22nd, 2025 | November 13, 2025 8 months ago November 13th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | Not reported |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Gemini 2.5 Flash Lite | GPT-5.1-Codex-Mini | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File🎵Audio🎬Video | 🖼️Image📝Text |
Reasoning Controls Defaults and configurable reasoning effort | Optional | OptionalEffort: High, Medium, LowDefault: Medium |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Gemini | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Pricing
Gemini 2.5 Flash Lite is roughly 0.4x less expensive compared to GPT-5.1-Codex-Mini for input tokens and roughly 0.2x less expensive for output tokens.
| Gemini 2.5 Flash Lite | GPT-5.1-Codex-Mini | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.10 per million tokens | $0.25 per million tokens |
Output Token Cost Cost per million output tokens | $0.40 per million tokens | $2.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.014 per search | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.01 per million tokens | $0.02 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $0.08 per million tokens | Not specified |
Reasoning Token Cost Cost for internal reasoning tokens | $0.40 per million tokens | Not specified |
Image Input Cost Additional cost for each image input | $0.0000001 per image | Not specified |
Audio Input Cost Additional cost for audio input | $0.0000003 per unit | Not specified |
Audio Cache Cost Cost to reuse cached audio input tokens | $0.03 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Gemini 2.5 Flash Lite and GPT-5.1-Codex-Mini.
| Gemini 2.5 Flash Lite | GPT-5.1-Codex-Mini | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | Benchmark not available. | 1,151 Elo (#67 in Game Dev (43.5% win rate)) |
At a Glance
Quick overview of what makes Gemini 2.5 Flash Lite and GPT-5.1-Codex-Mini unique.
Gemini 2.5 Flash Lite by Google understands both text and images, handles audio, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Very affordable at $0.10/M input and $0.40/M output tokens. Released July 22nd, 2025.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. Includes built-in content moderation for safer outputs. Released November 13th, 2025.Explore More Comparisons
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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