LLM Comparison
GPT-5.6 Terra vs Kimi K3
Side-by-side specs, pricing & capabilities · Updated September 2026
Price vs Intelligence
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2/6 models| Organization | ||
| OpenTools Score | 70 10.1 | 80 8.9 |
| Family | GPT-5.6 | Kimi |
| Status | Current | Current |
| Release Date | Jul 2026 | — |
| Context Window | 1.1M tokens | 1.0M tokens |
| Input Price | $2.00/M tokens | $3.00/M tokens |
| Output Price | $12.00/M tokens | $15.00/M tokens |
| Pricing Notes | OpenAI pricing page lists $2.50 input and $15 output per 1M tokens, with 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 |
| Training Cutoff | Feb 16, 2026 | — |
| Max Output | 128K tokens | 131K tokens |
| API Identifier | gpt-5.6-terra | kimi-k3 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 55artificial-analysis | 57artificial-analysis |
| Artificial Analysis Coding Agent Index | 77.4artificial-analysis | — |
| Artificial Analysis Intelligence Index v4.3 | 42.2515artificial-analysis | 44https://artificialanalysis.ai/models/kimi-k3 |
| GPQA Diamond | 92.5253artificial-analysis | 93.5354artificial-analysis |
| SciCode | 54.9769artificial-analysis | 59.4907artificial-analysis |
| Terminal-Bench 2.1 | 88.015artificial-analysis | 85.0187artificial-analysis |
| AA-Briefcase | — | 1543artificial-analysis |
| AA-Briefcase Rubric Pass Rate | — | 51artificial-analysis |
| Artificial Analysis Intelligence Index v4.1.1 | — | 60artificial-analysis |
| View GPT-5.6 Terra | View Kimi K3 | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GPT-5.6 TerraCheapest | $2.00 | $6.00 | $8.00 | — |
| Kimi K3 | $3.00 | $7.50 | $10.50 | +31% |
OpenAI
GPT-5.6 Terra
GPT-5.6 Terra is OpenAI balanced GPT-5.6 model for teams that need strong reasoning and agentic performance at lower cost than Sol. OpenAI model docs list a 1.05M token context window, 128K max output, and support for functions, web search, file search, and computer use.
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.
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