DeepSeek R1 0528 vs GPT-5.1 Codex Mini
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.1 Codex Mini by OpenAI wins on 7 of 14 benchmarks against DeepSeek R1 0528 by DeepSeek, which leads on 5. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from the AI Value Index.
Category-by-Category Breakdown
General Intelligence: In general intelligence, DeepSeek R1 0528 scores 1375 on Chatbot Arena ELO compared to GPT-5.1 Codex Mini's 1310, while DeepSeek R1 0528 scores 84.0% on MMLU-Pro compared to GPT-5.1 Codex Mini's 72.0%.
Coding: In coding, both score 88.0% on HumanEval+, while both score 55.0% on SWE-bench Verified, while GPT-5.1 Codex Mini scores 65.0% on LiveCodeBench compared to DeepSeek R1 0528's 58.0%.
Math: In math, DeepSeek R1 0528 scores 96.0% on MATH compared to GPT-5.1 Codex Mini's 78.0%, while DeepSeek R1 0528 scores 97.5% on GSM8K compared to GPT-5.1 Codex Mini's 92.0%.
Reasoning: In reasoning, DeepSeek R1 0528 scores 81.0% on GPQA Diamond compared to GPT-5.1 Codex Mini's 52.0%, while GPT-5.1 Codex Mini scores 35.0% on ARC-AGI compared to DeepSeek R1 0528's 15.0%.
Context: In context, GPT-5.1 Codex Mini scores 400K on Context Length compared to DeepSeek R1 0528's 131K.
Pricing Comparison
DeepSeek R1 0528 costs $0.55/1M input tokens and $2.2/1M output tokens, while GPT-5.1 Codex Mini costs $0.25/1M input and $2.0/1M output. GPT-5.1 Codex Mini is the more affordable option for API usage.
Speed Comparison
DeepSeek R1 0528 generates output at 40 tok/s compared to GPT-5.1 Codex Mini's 170 tok/s, and the time to first token is 900 ms for DeepSeek R1 0528 versus 180 ms for GPT-5.1 Codex Mini. GPT-5.1 Codex Mini delivers faster throughput.
Verdict
For developers prioritizing general intelligence and math, DeepSeek R1 0528 has the edge. For those who value affordability and speed, GPT-5.1 Codex Mini is the stronger choice.
View Individual Model Pages
DeepSeek R1 0528 vs GPT-5.1 Codex Mini — FAQ
Which is better, DeepSeek R1 0528 or GPT-5.1 Codex Mini?
GPT-5.1 Codex Mini wins on more benchmarks overall (7 vs 5). However, the best choice depends on your specific needs — each model excels in different areas.
How does DeepSeek R1 0528 compare to GPT-5.1 Codex Mini for coding?
Both models score 55.0% on SWE-bench Verified, making them equally capable for coding tasks.
Is DeepSeek R1 0528 cheaper than GPT-5.1 Codex Mini?
Yes, GPT-5.1 Codex Mini is cheaper. DeepSeek R1 0528 costs $0.55/1M input and $2.2/1M output tokens. GPT-5.1 Codex Mini costs $0.25/1M input and $2.0/1M output tokens.
Which is faster, DeepSeek R1 0528 or GPT-5.1 Codex Mini?
GPT-5.1 Codex Mini is faster, generating output at 170 tok/s compared to 40 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the DeepSeek R1 0528 vs GPT-5.1 Codex Mini comparison cover?
This comparison covers 14 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, Time to First Token, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.