Custom Comparison
Compare 2 AI Models
Gemini 3.8 Flash vs GPT-6 Luna
Gemini 3.8 FlashGoogle
GPT-6 LunaOpenAI
Up to 3 models. Every selection is in the address bar, so the comparison is a link you can send.
Interactive Comparison
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$0.75 / $3.75 per 1M tokens (introductory, to 31 Dec 2026) | $0.10 / $0.50 per 1M tokens | |
|---|---|---|
| Identity | ||
| Developer | OpenAI | |
| Released | Sep 2026 | Sep 2026 |
| Status | GA | GA |
| Licence | Proprietary | Proprietary |
| Self-hostable | No | No |
| Cost | ||
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $1.500 / 1M tokens | $0.200 / 1M tokens |
| Input price | $0.750 / 1M tokens | $0.100 / 1M tokens |
| Output price | $3.750 / 1M tokens | $0.500 / 1M tokens |
| Cached input | — | $0.01 per 1M tokens |
| Batch discount | — | 50% (Batch and Flex) |
| Capacity | ||
| Context window | 1M tokens | 1,050,000 tokens |
| Max output | 64k tokens | 128k tokens |
| Long-context surcharge | — | Prompts over 272K input tokens: 2x input and cache rates, 1.5x output |
| Capability | ||
| Vision in | — | Yes |
| Audio in | — | No |
| Function calling | — | Yes |
| Structured output | — | Yes |
| Extended reasoning | Tunable thinking: low, medium (default), high. The "minimal" level is not supported. | Yes |
| Web search | — | Yes |
| Code execution | — | Yes |
| Access | ||
| API | Yes | Yes |
| Chat app | Yes | Yes |
| Fine-tuning | — | No |
| Measured quality | ||
| LMArena Elo | 1494 (checked Oct 2026) | 1444 (checked Oct 2026) |
| LMArena rank | Rank 11 | Rank 85 |
| GPQA Diamond | 95 | — |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 996 | 7220 |
