DeepSeek V4.1 Flash vs OpenAI GPT-6 Luna
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- DeepSeek V4.1 Flash is 1.3× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
- DeepSeek V4.1 Flash output costs $0.18 per 1M via Decart, against the list price of $0.50.
- GPT-6 Luna is rated 98 points higher on the chess arena.
| DeepSeek V4.1 Flash | GPT-6 Luna | |
|---|---|---|
| Vendor | DeepSeek | OpenAI |
| Released | 2026-09-10 | 2026-09-22 |
| Input / 1M | $0.045 | $0.10 |
| Output / 1M | $0.50 | $0.50 |
| Cached input / 1M | $0.0060 | $0.01 |
| Blended / 1M (3:1) | $0.159 | $0.20 |
| Context | 1M | 1M |
| Max output | 944K | 128K |
| Accepts | text, image | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 41 | 7 |
| Cheapest provider, output | $0.18 | $0.50 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | 1472 ±77 | 1570 ±115 |
| Vendor API status | Operational | Operational |
Cost calculator
DeepSeek V4.1 Flash
$10.20 per month$0.34 per day
GPT-6 Luna
$13.50 per month$0.45 per day
DeepSeek V4.1 Flash saves $3.30 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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