Compare · ModelsLive · 2 picked · head to head
GPT-5.1-Codex vs Grok 4.3
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.1-Codex wins on 6/8 benchmarks
GPT-5.1-Codex wins 6 of 8 shared benchmarks. Leads in coding · reasoning · language.
Category leads
coding·GPT-5.1-Codexreasoning·GPT-5.1-Codexlanguage·GPT-5.1-Codexmath·Grok 4.3knowledge·GPT-5.1-Codex
Hype vs Reality
Attention vs performance
GPT-5.1-Codex
#27 by perf·no signal
Grok 4.3
#32 by perf·no signal
Best value
Grok 4.3
2.9x better value than GPT-5.1-Codex
GPT-5.1-Codex
12.2 pts/$
$5.63/M
Grok 4.3
35.6 pts/$
$1.88/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
xAI
$250.0B·Tier 1
Head to head
8 benchmarks · 2 models
GPT-5.1-CodexGrok 4.3
LiveBench · Agentic Coding
GPT-5.1-Codex leads by +3.3
GPT-5.1-Codex
53.3
Grok 4.3
50.0
LiveBench · Coding
GPT-5.1-Codex leads by +1.9
GPT-5.1-Codex
71.8
Grok 4.3
69.9
LiveBench · Data Analysis
GPT-5.1-Codex leads by +5.0
GPT-5.1-Codex
60.8
Grok 4.3
55.8
LiveBench · If
GPT-5.1-Codex leads by +0.6
GPT-5.1-Codex
63.4
Grok 4.3
62.8
LiveBench · Language
Grok 4.3 leads by +4.1
GPT-5.1-Codex
69.5
Grok 4.3
73.6
LiveBench · Mathematics
Grok 4.3 leads by +4.8
GPT-5.1-Codex
79.6
Grok 4.3
84.3
LiveBench · Overall
GPT-5.1-Codex leads by +1.9
GPT-5.1-Codex
68.6
Grok 4.3
66.7
LiveBench · Reasoning
GPT-5.1-Codex leads by +11.2
GPT-5.1-Codex
82.0
Grok 4.3
70.8
Full benchmark table
| Benchmark | GPT-5.1-Codex | Grok 4.3 |
|---|---|---|
LiveBench · Agentic Coding | 53.3 | 50.0 |
LiveBench · Coding | 71.8 | 69.9 |
LiveBench · Data Analysis | 60.8 | 55.8 |
LiveBench · If | 63.4 | 62.8 |
LiveBench · Language | 69.5 | 73.6 |
LiveBench · Mathematics | 79.6 | 84.3 |
LiveBench · Overall | 68.6 | 66.7 |
LiveBench · Reasoning | 82.0 | 70.8 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 | |
| $1.25 | $2.50 | 1.0M tokens (~500 books) | $15.63 |