GPT-5.1 Codex vs Mistral Small 4
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Mistral Small 4 by Mistral wins on 4 of 5 benchmarks against GPT-5.1 Codex by OpenAI, which leads on 1. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Reasoning: In reasoning, Mistral Small 4 scores 75.8% on GPQA Diamond compared to GPT-5.1 Codex's 65.0%.
Context: In context, GPT-5.1 Codex scores 400K on Context Length compared to Mistral Small 4's 262K.
Pricing Comparison
GPT-5.1 Codex costs $1.3/1M input tokens and $10.0/1M output tokens, while Mistral Small 4 costs $0.15/1M input and $0.60/1M output. Mistral Small 4 is the more affordable option for API usage.
Verdict
Mistral Small 4 leads across the board in affordability, making it the stronger overall choice in this comparison.
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GPT-5.1 Codex vs Mistral Small 4 — FAQ
Which is better, GPT-5.1 Codex or Mistral Small 4?
Mistral Small 4 wins on more benchmarks overall (4 vs 1). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.1 Codex compare to Mistral Small 4 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is GPT-5.1 Codex cheaper than Mistral Small 4?
Yes, Mistral Small 4 is cheaper. GPT-5.1 Codex costs $1.3/1M input and $10.0/1M output tokens. Mistral Small 4 costs $0.15/1M input and $0.60/1M output tokens.
Which is faster, GPT-5.1 Codex or Mistral Small 4?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the GPT-5.1 Codex vs Mistral Small 4 comparison cover?
This comparison covers 5 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, Cached Input Cost. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.