← All Models

GPT-5.5 vs Kimi K3

Kimi K3 leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

Kimi K3

Faster

Tie

Detailed Comparison

CategoryGPT-5.5Kimi K3
ProviderOpenAI Moonshot AI
Context Window128K 128K
Input Price ($/1M)$5 $0.6 WIN
Output Price ($/1M)$30 $2.5 WIN
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceNo Yes

Frequently Asked Questions

Which is cheaper, GPT-5.5 or Kimi K3?

Kimi K3 is approximately 91% cheaper than GPT-5.5 per million tokens.

Which has a larger context window?

GPT-5.5 supports 128K context, while Kimi K3 supports 128K.

Is GPT-5.5 or Kimi K3 open source?

GPT-5.5 is proprietary. Kimi K3 is open source.

Related Articles

Kimi K3 Benchmark Evaluation Guide for Coding Agents

Kimi K3 Proves Intelligence Still Costs Too Much

Kimi K3 could pressure the middle tier of AI models

Kimi K3 turns model hype into harness work

Kimi API quickstart adds K2.7 Code and Highspeed

Kimi K2.6 turns a prompt into brand sites

More Comparisons

GPT-5.5 vs Claude Opus 4.5GPT-5.5 vs Llama 4 ScoutGPT-5.5 vs Claude Haiku 4.5GPT-5.5 vs Qwen 3.6GPT-5.5 vs Kimi K2.7 CodeGPT-5.5 vs DeepSeek V4 FlashGPT-5.5 vs Claude Sonnet 4.6GPT-5.5 vs Claude Fable 5Kimi K3 vs Claude Opus 4.5Kimi K3 vs Llama 4 ScoutKimi K3 vs Claude Haiku 4.5Kimi K3 vs Qwen 3.6Kimi K3 vs Kimi K2.7 CodeKimi K3 vs DeepSeek V4 FlashKimi K3 vs Claude Sonnet 4.6Kimi K3 vs Claude Fable 5