Compare · ModelsLive · 2 picked · head to head
GPT-5.1-Codex-Max vs Kimi K2 Thinking
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.1-Codex-Max wins on 8/8 benchmarks
GPT-5.1-Codex-Max wins 8 of 8 shared benchmarks. Leads in coding · reasoning · language.
Category leads
coding·GPT-5.1-Codex-Maxreasoning·GPT-5.1-Codex-Maxlanguage·GPT-5.1-Codex-Maxmath·GPT-5.1-Codex-Maxknowledge·GPT-5.1-Codex-Max
Hype vs Reality
Attention vs performance
GPT-5.1-Codex-Max
#10 by perf·no signal
Kimi K2 Thinking
#77 by perf·no signal
Best value
Kimi K2 Thinking
2.7x better value than GPT-5.1-Codex-Max
GPT-5.1-Codex-Max
12.8 pts/$
$5.63/M
Kimi K2 Thinking
34.4 pts/$
$1.55/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
moonshotai
private · undisclosed
Head to head
8 benchmarks · 2 models
GPT-5.1-Codex-MaxKimi K2 Thinking
LiveBench · Agentic Coding
GPT-5.1-Codex-Max leads by +18.3
GPT-5.1-Codex-Max
56.7
Kimi K2 Thinking
38.3
LiveBench · Coding
GPT-5.1-Codex-Max leads by +13.9
GPT-5.1-Codex-Max
81.4
Kimi K2 Thinking
67.4
LiveBench · Data Analysis
GPT-5.1-Codex-Max leads by +2.6
GPT-5.1-Codex-Max
54.9
Kimi K2 Thinking
52.3
LiveBench · If
GPT-5.1-Codex-Max leads by +5.1
GPT-5.1-Codex-Max
67.1
Kimi K2 Thinking
62.0
LiveBench · Language
GPT-5.1-Codex-Max leads by +8.9
GPT-5.1-Codex-Max
75.4
Kimi K2 Thinking
66.5
LiveBench · Mathematics
GPT-5.1-Codex-Max leads by +2.6
GPT-5.1-Codex-Max
83.7
Kimi K2 Thinking
81.1
LiveBench · Overall
GPT-5.1-Codex-Max leads by +10.4
GPT-5.1-Codex-Max
72.0
Kimi K2 Thinking
61.6
LiveBench · Reasoning
GPT-5.1-Codex-Max leads by +21.1
GPT-5.1-Codex-Max
84.6
Kimi K2 Thinking
63.5
Full benchmark table
| Benchmark | GPT-5.1-Codex-Max | Kimi K2 Thinking |
|---|---|---|
LiveBench · Agentic Coding | 56.7 | 38.3 |
LiveBench · Coding | 81.4 | 67.4 |
LiveBench · Data Analysis | 54.9 | 52.3 |
LiveBench · If | 67.1 | 62.0 |
LiveBench · Language | 75.4 | 66.5 |
LiveBench · Mathematics | 83.7 | 81.1 |
LiveBench · Overall | 72.0 | 61.6 |
LiveBench · Reasoning | 84.6 | 63.5 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| GPT-5.1-Codex-Max | $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 |
| Kimi K2 Thinking | $0.60 | $2.50 | 262K tokens (~131 books) | $10.75 |
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