LLM Comparison
GPT-5.6 Luna vs Kimi K3
Side-by-side specs, pricing & capabilities · Updated August 2026
Price vs Intelligence
Add to comparison
2/6 models| Organization | ||
| OpenTools Score | 36 10.3 | 73 8.1 |
| Family | GPT-5.6 | Kimi |
| Status | Current | Current |
| Release Date | Jul 2026 | — |
| Context Window | 1.1M tokens | 1.0M tokens |
| Input Price | $1.00/M tokens | $3.00/M tokens |
| Output Price | $6.00/M tokens | $15.00/M tokens |
| Pricing Notes | OpenAI pricing page lists $1 input and $6 output per 1M tokens, plus GPT-5.6 cache-write and cache-read pricing. | Official Kimi pricing lists kimi-k3 at $3.00 per 1M cache-miss input tokens, $0.30 per 1M cache-hit input tokens, and $15.00 per 1M output tokens. Official troubleshooting docs say max_completion_tokens defaults to 131,072 and maximum output length is 1024*1024 minus prompt tokens. |
| Capabilities | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents | textvisionreasoningcodingtool-usestructured-outputjson-modelong-contextagentic |
| Max Output | 128K tokens | 131K tokens |
| API Identifier | gpt-5.6-luna | kimi-k3 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 51artificial-analysis | 57artificial-analysis |
| Artificial Analysis Coding Agent Index | 74.6artificial-analysis | — |
| AA-Briefcase | — | 1543artificial-analysis |
| AA-Briefcase Rubric Pass Rate | — | 51artificial-analysis |
| View GPT-5.6 Luna | View Kimi K3 | |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GPT-5.6 LunaCheapest | $1.00 | $3.00 | $4.00 | — |
| Kimi K3 | $3.00 | $7.50 | $10.50 | +163% |
OpenAI
GPT-5.6 Luna
GPT-5.6 Luna is OpenAI lower-cost GPT-5.6 model for high-volume reasoning, coding, and agentic workloads. OpenAI model docs list the same 1.05M token context window, 128K max output, and major tool support as the larger GPT-5.6 variants.
Moonshot AI
Kimi K3
Kimi K3 is Moonshot AI open-weight 2.8T-parameter flagship model for long-horizon coding, end-to-end knowledge work, reasoning, and native multimodal understanding. Official Kimi documentation lists the API model ID kimi-k3, a 1M-token context window, automatic context caching, tool calls, JSON mode, structured outputs, and always-on reasoning effort controls.
More Comparisons
Looking for more AI models?
Browse All LLMs