GPT-5.1 Codex vs Kimi K2.7 Code
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Kimi K2.7 Code by Moonshot AI wins on 5 of 7 benchmarks against GPT-5.1 Codex by OpenAI, which leads on 2. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, Kimi K2.7 Code scores 1251 on Design Arena ELO compared to GPT-5.1 Codex's 1197, while Kimi K2.7 Code scores 1280 on Website Arena ELO compared to GPT-5.1 Codex's 1174.
Reasoning: In reasoning, Kimi K2.7 Code scores 81.4% 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 Kimi K2.7 Code's 262K.
Pricing Comparison
GPT-5.1 Codex costs $1.3/1M input tokens and $10.0/1M output tokens, while Kimi K2.7 Code costs $0.71/1M input and $3.5/1M output. Kimi K2.7 Code is the more affordable option for API usage.
Verdict
Kimi K2.7 Code leads across the board in affordability, making it the stronger overall choice in this comparison.
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GPT-5.1 Codex vs Kimi K2.7 Code — FAQ
Which is better, GPT-5.1 Codex or Kimi K2.7 Code?
Kimi K2.7 Code wins on more benchmarks overall (5 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.1 Codex compare to Kimi K2.7 Code 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 Kimi K2.7 Code?
Yes, Kimi K2.7 Code is cheaper. GPT-5.1 Codex costs $1.3/1M input and $10.0/1M output tokens. Kimi K2.7 Code costs $0.71/1M input and $3.5/1M output tokens.
Which is faster, GPT-5.1 Codex or Kimi K2.7 Code?
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 Kimi K2.7 Code comparison cover?
This comparison covers 7 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, Cached Input Cost, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.