LLM Comparison
GPT-6 Luna vs Solar Pro 3
Side-by-side specs, pricing & capabilities · Updated September 2026
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 9 25.1 | |
| Family | GPT-6 | Solar |
| Status | Current | Current |
| Release Date | Sep 2026 | Jan 2026 |
| Context Window | 1.1M tokens | 128K tokens |
| Input Price | $0.10/M tokens | $0.15/M tokens |
| Output Price | $0.50/M tokens | $0.60/M tokens |
| Pricing Notes | OpenAI standard API, USD per million tokens for prompts up to 272K input tokens: $0.10 input, $0.01 cached input, $0.125 cache writes, $0.50 output. Above 272K input tokens, the full request costs 2x input/cache and 1.5x output. Batch/Flex cost 50% of Standard; Fast costs 2x; regional processing adds 10% where available. Reasoning output tokens are charged at output rates. | Cache read: $0.0150/M tokens |
| Capabilities | textvisionreasoningcodingtool-uselong-contextcontext-caching | textcode |
| Training Cutoff | 2026-05-18 | — |
| Max Output | 128K tokens | — |
| API Identifier | gpt-6-luna | upstage/solar-pro-3 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.3.2 | 37.2559686869738artificial-analysis | — |
| Artificial Analysis Intelligence Index v4.3 | — | 7.8155artificial-analysis |
| GPQA Diamond | — | 72.4242artificial-analysis |
| SciCode | — | 25.463artificial-analysis |
| Terminal-Bench 2.1 | — | 11.985artificial-analysis |
| View GPT-6 Luna | View Solar Pro 3 | |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GPT-6 LunaCheapest | $0.10 | $0.25 | $0.35 | — |
| Solar Pro 3 | $0.15 | $0.30 | $0.45 | +29% |
OpenAI
GPT-6 Luna
GPT-6 Luna is OpenAI's efficient reasoning model for focused, high-volume tasks. It accepts text and images, produces text, supports a 1,050,000-token context window and 128,000 output tokens, and is available through the Responses and Chat Completions APIs under the exact gpt-6-luna identifier.
Upstage
Solar Pro 3
Solar Pro 3 is a large language model from Upstage. Supports up to 128,000 token context window. Available from $0.15/M input tokens.
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