# GPT-5: AI model fact sheet

- **Provider:** openai
- **Released:** 2025-08-07
- **Context window:** 400,000 tokens
- **Parameters:** 1.8T
- **API pricing:** $1.25 / 1M input, $10.00 / 1M output
- **OpenRouter ID:** openai/gpt-5
- **Capabilities:** conversation, reasoning, code-generation, analysis, planning, memory, agentic-tool-use, function-calling

OpenAI’s most advanced model, offering major improvements in reasoning, code quality, and user experience. Optimized for complex tasks that require step-by-step reasoning, instruction following, and accuracy in high-stakes use cases. Supports test-time routing and advanced prompt understanding (e.g., "think hard about this"). Reductions in hallucination/sycophancy with better performance in coding, writing, and health-related tasks.

## Benchmarks

| Benchmark | Score |
| --- | --- |
| Expected MMLU | 90%+ |
| Reasoning Performance | Significant improvement over GPT-4 |
| SWE-bench Verified | 74.9% |

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/gpt-5