LLM Comparison
GPT-5.6 Luna vs GPT-5.6 Terra
Side-by-side specs, pricing & capabilities · Updated August 2026
Price vs Intelligence
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 36 10.3 | 59 6.8 |
| Family | GPT-5.6 | GPT-5.6 |
| Status | Current | Current |
| Release Date | Jul 2026 | Jul 2026 |
| Context Window | 1.1M tokens | 1.1M tokens |
| Input Price | $1.00/M tokens | $2.50/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. | OpenAI pricing page lists $2.50 input and $15 output per 1M tokens, with GPT-5.6 cache-write and cache-read pricing. |
| Capabilities | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | gpt-5.6-luna | gpt-5.6-terra |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 51artificial-analysis | 55artificial-analysis |
| Artificial Analysis Coding Agent Index | 74.6artificial-analysis | 77.4artificial-analysis |
| View GPT-5.6 Luna | View GPT-5.6 Terra | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GPT-5.6 LunaCheapest | $1.00 | $3.00 | $4.00 | — |
| GPT-5.6 Terra | $2.50 | $7.50 | $10.00 | +150% |
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.
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.
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