DeepSeek V4.1 Flash vs GPT-5.1-Codex-Max
DeepSeek V4.1 Flash is cheaper on output tokens, while DeepSeek V4.1 Flash offers a larger context window. Choose DeepSeek V4.1 Flash or GPT-5.1-Codex-Max based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | DeepSeek V4.1 Flash | GPT-5.1-Codex-Max |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Input / 1M tokens | $0.05 | $1.25 |
| Output / 1M tokens | $0.50 | $10.00 |
| Context window | 1M | 400K |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Nov 2025 |
| LMArena (Chatbot Arena) Elo score | 1465 | — |
| GPQA Diamond score | 93.2 | — |
| LMArena WebDev Elo score | 1665 | — |
| Epoch Capabilities Index score | 159 | — |
| LMArena Vision Elo score | 1278 | — |
| LiveBench score | — | 74.4 |
FAQ
Is DeepSeek V4.1 Flash or GPT-5.1-Codex-Max cheaper?
DeepSeek V4.1 Flash is cheaper on output tokens ($0.50 vs $10.00 per 1M).
Which has the larger context window, DeepSeek V4.1 Flash or GPT-5.1-Codex-Max?
DeepSeek V4.1 Flash has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.