LLM Comparison
GPT-5.6 Luna vs Palmyra X5
Side-by-side specs, pricing & capabilities · Updated August 2026
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 36 10.3 | |
| Family | GPT-5.6 | Palmyra |
| Status | Current | Current |
| Release Date | Jul 2026 | Jan 2026 |
| Context Window | 1.1M tokens | 1.0M tokens |
| Input Price | $1.00/M tokens | $0.60/M tokens |
| Output Price | $6.00/M tokens | $6.00/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. | — |
| Capabilities | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents | textcode |
| Max Output | 128K tokens | 8K tokens |
| API Identifier | gpt-5.6-luna | writer/palmyra-x5 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 51artificial-analysis | — |
| Artificial Analysis Coding Agent Index | 74.6artificial-analysis | — |
| View GPT-5.6 Luna | View Palmyra X5 | |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Palmyra X5Cheapest | $0.60 | $3.00 | $3.60 | — |
| GPT-5.6 Luna | $1.00 | $3.00 | $4.00 | +11% |
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.
Writer
Palmyra X5
Palmyra X5 is a large language model from Writer. Supports up to 1,040,000 token context window. Available from $0.60/M input tokens.
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