# DeepSeek V4 vs GPT-5.5 (2026): Benchmarks, Price & Verdict | Alher Tech

> DeepSeek V4 vs GPT-5.5: head-to-head 2026 comparison across Arena Elo, MMLU, GPQA, HumanEval, context window and pricing. Verdict + use cases.

- Canonical page: https://alhertech.com/en/ai-comparison/deepseek-v4-vs-gpt-5-5/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

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|  | DeepSeek V4 | GPT-5.5 |
| --- | --- | --- |
| arenaElo | 1395 | 1432 |
| humanEval | 91 | 94.2 |
| sweBench | 62 | 66 |
| mmlu | 91.5 | 93 |
| gpqa | 73 | 68.7 |
| aime | 90 | 92 |
| Price in/out ($/M) | $1.74 / $3.48 | $12 / $48 |

## Our verdict

GPT-5.5 ($12/$48 per M tokens) leads on Arena Elo, multimodal breadth (audio in/out) and creative writing. DeepSeek V4 ($1.74/$3.48) is roughly 85% cheaper for similar frontier-tier reasoning and offers full open-weights under MIT: no vendor lock-in. For consumer-facing voice products, GPT-5.5 wins; for batch document analysis or self-hosted enterprise, V4 is the rational choice.

[DeepSeek V4](https://alhertech.com/en/ai-comparison/deepseek-v4/) · [GPT-5.5](https://alhertech.com/en/ai-comparison/gpt-5-5/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)