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.
Model Provider The organization behind this AI's development | ||
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.
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.
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.
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Compare GPT-5 Codex with:
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Models optimized for creative writing
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Content creation and marketing tasks
💻Technology
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🔬Science
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