Compare · ModelsLive · 2 picked · head to head
GPT-5.1-Codex vs GPT-5.5
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.5 wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · GPT-5.1-Codex · GPT-5.5 are still filling in scores.
Hype vs Reality
Attention vs performance
GPT-5.1-Codex
#23 by perf·no signal
GPT-5.5
#2 by perf·no signal
Best value
GPT-5.1-Codex
2.5x better value than GPT-5.5
GPT-5.1-Codex
12.2 pts/$
$5.63/M
GPT-5.5
4.9 pts/$
$17.50/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 |
|---|---|---|---|---|
| $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 | |
| $5.00 | $30.00 | 400K tokens (~200 books) | $112.50 |