Compare · ModelsLive · 2 picked · head to head
GPT-5.5 Pro vs Kimi K2 Thinking
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.5 Pro wins on 1/1 benchmarks
GPT-5.5 Pro wins 1 of 1 shared benchmarks. Leads in knowledge.
Category leads
knowledge·GPT-5.5 Pro
Hype vs Reality
Attention vs performance
GPT-5.5 Pro
#1 by perf·no signal
Kimi K2 Thinking
#79 by perf·no signal
Best value
Kimi K2 Thinking
41.1x better value than GPT-5.5 Pro
GPT-5.5 Pro
0.8 pts/$
$105.00/M
Kimi K2 Thinking
34.4 pts/$
$1.55/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
moonshotai
private · undisclosed
Head to head
1 benchmark · 2 models
GPT-5.5 ProKimi K2 Thinking
GPQA diamond
GPT-5.5 Pro leads by +15.2
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
GPT-5.5 Pro
94.2
Kimi K2 Thinking
79.0
Full benchmark table
| Benchmark | GPT-5.5 Pro | Kimi K2 Thinking |
|---|---|---|
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 94.2 | 79.0 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $30.00 | $180.00 | 400K tokens (~200 books) | $675.00 | |
| $0.60 | $2.50 | 262K tokens (~131 books) | $10.75 |