Claude 4.5 Haiku vs GPT-5 Pro
Direct spec comparison of Claude 4.5 Haiku (from Anthropic) and GPT-5 Pro (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 Claude 4.5 HaikuAnthropic |  GPT-5 ProOpenAI | |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Family | Claude | GPT |
| Release date | 2025-10-01 | 2025-08-07 |
| Context window | 200,000 tokens | 400,000 tokens |
| Parameters | — | — |
| Modality | text, vision | text, vision, audio |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | Fast, cost-effective Claude model. | Higher-reasoning variant of GPT-5, used for harder scientific and research tasks (e.g., immunology breakthroughs at NIH). Same 400K context as GPT-5; trades latency for depth. |
| Links |
More like this
Looking for a different head-to-head? Build your own comparison on the multi-model tool.
Or see all Claude 4.5 Haiku details / GPT-5 Pro details.