Compare · ModelsLive · 2 picked · head to head
GPT-5.5 vs Kimi K2 Thinking
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.5 wins on 2/2 benchmarks
GPT-5.5 wins 2 of 2 shared benchmarks. Leads in knowledge · coding.
Category leads
knowledge·GPT-5.5coding·GPT-5.5
Hype vs Reality
Attention vs performance
GPT-5.5
#2 by perf·no signal
Kimi K2 Thinking
#79 by perf·no signal
Best value
Kimi K2 Thinking
7.1x better value than GPT-5.5
GPT-5.5
4.9 pts/$
$17.50/M
Kimi K2 Thinking
34.4 pts/$
$1.55/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
moonshotai
private · undisclosed
Head to head
2 benchmarks · 2 models
GPT-5.5Kimi K2 Thinking
GPQA diamond
GPT-5.5 leads by +14.6
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
93.6
Kimi K2 Thinking
79.0
Terminal Bench
GPT-5.5 leads by +47.0
Terminal-Bench 2.0 · evaluates AI agents on real terminal-based coding tasks · writing scripts, debugging, running tests, and managing projects entirely through command-line interaction. Tests both code quality and terminal fluency. Claude Opus 4.7 scores 69.4%, demonstrating significant agentic terminal competence.
GPT-5.5
82.7
Kimi K2 Thinking
35.7
Full benchmark table
| Benchmark | GPT-5.5 | 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. | 93.6 | 79.0 |
Terminal Bench Terminal-Bench 2.0 · evaluates AI agents on real terminal-based coding tasks · writing scripts, debugging, running tests, and managing projects entirely through command-line interaction. Tests both code quality and terminal fluency. Claude Opus 4.7 scores 69.4%, demonstrating significant agentic terminal competence. | 82.7 | 35.7 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $5.00 | $30.00 | 400K tokens (~200 books) | $112.50 | |
| $0.60 | $2.50 | 262K tokens (~131 books) | $10.75 |