Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Data sourced from the Interestana AI Index, kept current as developers update their models.
Model A — DeepSeek
DeepSeek V3.5 is a mixture-of-experts model with 685B total parameters and 37B activated per token. Notable for delivering frontier performance at a fraction of the training cost of competing models.
Model B — OpenAI
GPT-5 is OpenAI’s next-generation multimodal model, extending native video understanding, audio synthesis, and unified reasoning across modalities in a single forward pass.
| Property | DeepSeek V3.5 | GPT-5 |
|---|---|---|
| Released | Mar 24, 2026 | Mar 18, 2026 |
| Developer | DeepSeek | OpenAI |
| Type | llm | multimodal |
| License | open-weight | proprietary |
| Context window | 128,000 | 1,000,000 |
| Parameters | 685B MoE (37B active) | undisclosed |
| Input $/M tokens | $0.27 | $5.00 |
| Output $/M tokens | $1.10 | $20.00 |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins).
Programmatic access available at /api/ai/compare?a=deepseek-v3-5&b=gpt-5. CORS is open. Citation guidance: /about/editorial-process.