Compare · ModelsLive · 2 picked · head to head
Claude Opus 5.5 vs GPT-5.1-Codex-Max
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · Claude Opus 5.5 · GPT-5.1-Codex-Max are still filling in scores.
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#3 by perf·#7 by attention
GPT-5.1-Codex-Max
#14 by perf·#4 by attention
Best value
GPT-5.1-Codex-Max
1.9x better value than Claude Opus 5.5
Claude Opus 5.5
6.9 pts/$
$12.00/M
GPT-5.1-Codex-Max
12.8 pts/$
$5.63/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
OpenAI
$840.0B·Tier 1
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 | |
| $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 |