LLM Comparison
GPT-5.5 Pro vs Kimi K2.5
Side-by-side specs, pricing & capabilities
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | ||
| Family | GPT | Kimi |
| Status | Current | Current |
| Release Date | Apr 2026 | Jan 2026 |
| Context Window | 1.1M tokens | 262K tokens |
| Input Price | $30.00/M tokens | $0.38/M tokens |
| Output Price | $180.00/M tokens | $1.72/M tokens |
| Pricing Notes | No cached input discount. Long context (>272K tokens): 2x input, 1.5x output. Batch API: 50% discount. Regional processing: 10% uplift. | Cache read: $0.1913/M tokens |
| Capabilities | textvisioncodetool-useextended-thinkingweb-search | textvisioncode |
| Training Cutoff | Dec 01, 2025 | — |
| Max Output | 128K tokens | 66K tokens |
| API Identifier | openai/gpt-5.5-pro | moonshotai/kimi-k2.5 |
| Benchmarks | ||
| GPQA Diamond | — | 87.9%artificial-analysis |
| GPQA Diamond | — | 87.6%https://huggingface.co/moonshotai/Kimi-K2.5 |
| MMLU-Pro | — | 87.1%https://huggingface.co/moonshotai/Kimi-K2.5 |
| Terminal-Bench 2.1 | — | 45.7%artificial-analysis |
| View GPT-5.5 Pro | View Kimi K2.5 | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Kimi K2.5Cheapest | $0.38 | $0.86 | $1.24 | — |
| GPT-5.5 Pro | $30.00 | $90.00 | $120.00 | +9556% |
OpenAI
GPT-5.5 Pro
GPT-5.5 Pro uses more compute to think harder and provide consistently better answers than GPT-5.5. Designed for the toughest problems, some requests may take several minutes. It excels at FrontierMath Tier 4 (39.6%) and BrowseComp (90.1%), offering the highest intelligence available from OpenAI at a premium price point.
Moonshot AI
Kimi K2.5
Kimi K2.5 is a multimodal llm from Moonshot AI. Supports up to 262,144 token context window. Available from $0.38/M input tokens.
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