Compare · ModelsLive · 2 picked · head to head
GPT-5.1-Codex vs GPT-5 Chat
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5 Chat wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · GPT-5.1-Codex · GPT-5 Chat are still filling in scores.
Hype vs Reality
Attention vs performance
GPT-5.1-Codex
#21 by perf·no signal
GPT-5 Chat
#1 by perf·#1 by attention
Best value
GPT-5 Chat
1.2x better value than GPT-5.1-Codex
GPT-5.1-Codex
12.2 pts/$
$5.63/M
GPT-5 Chat
14.6 pts/$
$5.63/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| GPT-5.1-Codex | $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 |
| GPT-5 Chat | $1.25 | $10.00 | 128K tokens (~64 books) | $34.38 |