What are the key differences between Codex and DeepSeek-R1?

Compare Codex and DeepSeek-R1 side by side on Lunoo to see detailed feature differences, AI scores, and expert analysis.

How are Codex and DeepSeek-R1 scored?

Codex has an AI score of 8.55/10 and DeepSeek-R1 has an AI score of 9.18/10. Scores are based on category fit, feature coverage, pricing signals, public reception, and recency.

Codex vs DeepSeek-R1 2026 - Compared

Codex

DeepSeek-R1

WINNER DeepSeek-R1

DeepSeek-R1 edges ahead with a score of 9.2/10 compared to 8.6/10 for Codex. While both are highly rated in their respec...

Codex

8.55 Great

Model Get Codex open_in_new

emoji_events WINNER

DeepSeek-R1

9.18 Excellent

Model Get DeepSeek-R1 open_in_new

psychology AI Verdict

DeepSeek-R1 edges ahead with a score of 9.2/10 compared to 8.6/10 for Codex. While both are highly rated in their respective fields, DeepSeek-R1 demonstrates a slight advantage in our AI ranking criteria. A detailed AI-powered analysis is being prepared for this comparison.

emoji_events Winner: DeepSeek-R1

verified Confidence: Low

Ready to decide? Get DeepSeek-R1 arrow_forward

description Overview

Codex

Codex is a generative pre-trained model developed by OpenAI and introduced in 2021, specifically designed to translate natural language prompts into functional computer code. As a descendant of the GPT-3 language model, it was further fine-tuned on billions of lines of source code from public GitHub repositories. Codex served as the underlying artificial intelligence engine for the initial release...

DeepSeek-R1

Released in January 2025 by the Chinese artificial intelligence company DeepSeek, DeepSeek-R1 is an open-weight language model focused on reasoning. Its training uses reinforcement learning to encourage step-by-step problem solving, with particular attention to mathematics, logic and coding. DeepSeek reported technical benchmark results competitive with proprietary reasoning models such as OpenAI'...