Model Comparison

GPT-5 Codex vs GPT-5 miniWhich is better in 2026?

Comparing GPT-5 Codex and GPT-5 mini across benchmarks, pricing, and capabilities.

Verdict: GPT-5 Codex vs GPT-5 mini — which is better?

GPT-5 Codex (by OpenAI) and GPT-5 mini (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Choose GPT-5 Codex if…

  • you want the most recent training data — it shipped Sep 2025

Choose GPT-5 mini if…

  • you want predictable pricing at $0.25/M input and $2.00/M output
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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GPT-5 Codex and GPT-5 mini don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5 mini specifies input context (400,000 tokens). Only GPT-5 mini specifies output context (128,000 tokens).

OpenAI
GPT-5 Codex
Input- tokens
Output- tokens
OpenAI
GPT-5 mini
Input400,000 tokens
Output128,000 tokens
Mon Jun 08 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5 mini supports multimodal inputs, whereas GPT-5 Codex does not.

GPT-5 mini can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5 Codex

Text
Images
Audio
Video

GPT-5 mini

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-5 Codex

Proprietary

Closed source

GPT-5 mini

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5 Codex was released on 2025-09-15, while GPT-5 mini was released on 2025-08-07.

GPT-5 Codex is 1 month newer than GPT-5 mini.

GPT-5 Codex

Sep 15, 2025

8 months ago

1mo newer
GPT-5 mini

Aug 7, 2025

10 months ago

Knowledge Cutoff

When training data ends

GPT-5 Codex has a knowledge cutoff of 2024-09-30, while GPT-5 mini has a cutoff of 2024-05-30.

GPT-5 Codex has more recent training data (up to 2024-09-30), making it potentially better informed about events through that date compared to GPT-5 mini (2024-05-30).

GPT-5 Codex

Sep 2024

4 mo newer
GPT-5 mini

May 2024

Outputs Comparison

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Key Takeaways

OpenAI

No standout differentiators in the data we have for this pair.

OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5 Codex
OpenAI
GPT-5 mini

FAQ

Common questions about GPT-5 Codex vs GPT-5 mini.

Which is better, GPT-5 Codex or GPT-5 mini?

GPT-5 Codex (OpenAI) and GPT-5 mini (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does GPT-5 Codex compare to GPT-5 mini in benchmarks?

GPT-5 Codex scores SWE-Bench Verified: 74.5%. GPT-5 mini scores AIME 2025: 91.1%, HMMT 2025: 87.8%, GPQA: 82.3%, FrontierMath: 22.1%, Humanity's Last Exam: 16.7%.

What are the context window sizes for GPT-5 Codex and GPT-5 mini?

GPT-5 Codex supports an unknown number of tokens and GPT-5 mini supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5 Codex and GPT-5 mini?

Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

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