GPT-4.1 vs GPT-5 Codex (Comparative Analysis)
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Comparative Analysis: GPT-4.1 vs. GPT-5 Codex
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Overview
GPT-4.1 was released 5 months before GPT-5 Codex.
 GPT-4.1 | GPT-5 Codex | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | 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 | 32.8K tokens | 128K tokens |
Release Date When this model first became publicly available | April 14, 2025 1 year ago April 14th, 2025 | September 23, 2025 10 months ago September 23rd, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | June 30, 2024 | September 30, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-4.1 | GPT-5 Codex | |
|---|---|---|
Input Types Supported input formats | 🖼️Image📝Text📁File | 📝Text🖼️Image |
Reasoning Controls Defaults and configurable reasoning effort | Not reported | Always enabled |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured OutputReasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Pricing
GPT-4.1 is roughly 1.6x more expensive compared to GPT-5 Codex for input tokens and roughly 0.8x less expensive for output tokens.
| GPT-4.1 | GPT-5 Codex | |
|---|---|---|
Input Token Cost Cost per million input tokens | $2.00 per million tokens | $1.25 per million tokens |
Output Token Cost Cost per million output tokens | $8.00 per million tokens | $10.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.50 per million tokens | $0.13 per million tokens |
Benchmarks
Compare relevant benchmarks between GPT-4.1 and GPT-5 Codex.
| GPT-4.1 | GPT-5 Codex | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,136 Elo (#72 in Game Dev (59.1% win rate)) | 1,138 Elo (#27 in Webapps (52.4% win rate)) |
At a Glance
Quick overview of what makes GPT-4.1 and GPT-5 Codex unique.
GPT-4.1 by OpenAI understands both text and images, can use external tools and APIs, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $2.00/M input and $8.00/M output tokens. Includes built-in content moderation for safer outputs. Released April 14th, 2025.GPT-5 Codex 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 $1.25/M input and $10.00/M output tokens. Includes built-in content moderation for safer outputs. Released September 23rd, 2025.Explore More Comparisons
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Compare GPT-5 Codex 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