Model Comparison

DeepSeek-V3 0324 vs GPT-5 CodexWhich is better in 2026?

Comparing DeepSeek-V3 0324 and GPT-5 Codex across benchmarks, pricing, and capabilities.

Verdict: DeepSeek-V3 0324 vs GPT-5 Codex — which is better?

DeepSeek-V3 0324 (by DeepSeek) and GPT-5 Codex (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 DeepSeek-V3 0324 if…

  • you need open weights you can self-host or fine-tune

Choose GPT-5 Codex if…

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

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

DeepSeek-V3 0324 and GPT-5 Codexdon'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 DeepSeek-V3 0324 specifies input context (163,840 tokens). Only DeepSeek-V3 0324 specifies output context (163,840 tokens).

DeepSeek
DeepSeek-V3 0324
Input163,840 tokens
Output163,840 tokens
OpenAI
GPT-5 Codex
Input- tokens
Output- tokens
Sat Jul 18 2026 • llm-stats.com

License

Usage and distribution terms

DeepSeek-V3 0324 is licensed under MIT + Model License (Commercial use allowed), while GPT-5 Codex uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

DeepSeek-V3 0324

MIT + Model License (Commercial use allowed)

Open weights

GPT-5 Codex

Proprietary

Closed source

Release Timeline

When each model was launched

DeepSeek-V3 0324 was released on 2025-03-25, while GPT-5 Codex was released on 2025-09-15.

GPT-5 Codex is 6 months newer than DeepSeek-V3 0324.

DeepSeek-V3 0324

Mar 25, 2025

1.3 years ago

GPT-5 Codex

Sep 15, 2025

10 months ago

5mo newer

Knowledge Cutoff

When training data ends

GPT-5 Codex has a documented knowledge cutoff of 2024-09-30, while DeepSeek-V3 0324's cutoff date is not specified.

We can confirm GPT-5 Codex's training data extends to 2024-09-30, but cannot make a direct comparison without DeepSeek-V3 0324's cutoff date.

DeepSeek-V3 0324

—

GPT-5 Codex

Sep 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

DeepSeek
Larger context window (163,840 tokens)
Has open weights
OpenAI

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against DeepSeek-V3 0324 and GPT-5 Codex side-by-side, then vote on the output you prefer.

DeepSeek-V3 0324
✓ Preferred
GPT-5 Codex
Open in Playground
AI Model Comparison Table
Feature
DeepSeek
DeepSeek-V3 0324
OpenAI
GPT-5 Codex

FAQ

Common questions about DeepSeek-V3 0324 vs GPT-5 Codex.

Which is better, DeepSeek-V3 0324 or GPT-5 Codex?

DeepSeek-V3 0324 (DeepSeek) and GPT-5 Codex (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 DeepSeek-V3 0324 compare to GPT-5 Codex in benchmarks?

DeepSeek-V3 0324 scores MATH-500: 94.0%, MMLU-Pro: 81.2%, GPQA: 68.4%, AIME 2024: 59.4%, LiveCodeBench: 49.2%. GPT-5 Codex scores SWE-Bench Verified: 74.5%.

What are the context window sizes for DeepSeek-V3 0324 and GPT-5 Codex?

DeepSeek-V3 0324 supports 164K tokens and GPT-5 Codex supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between DeepSeek-V3 0324 and GPT-5 Codex?

Key differences include licensing (MIT + Model License (Commercial use allowed) vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes DeepSeek-V3 0324 and GPT-5 Codex?

DeepSeek-V3 0324 is developed by DeepSeek and GPT-5 Codex is developed by OpenAI.

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