What is currently the best AI tool to use?

Essentially, the development of big models is too fast, and when you look at rankings, they are actually constantly changing.
Worldwide, in terms of comprehensive abilities:
As of August 2025, the global ranking of AI models in different fields is as follows: GPT-5 (OpenAI):
OpenAI has replaced multiple previous model versions with a unified GPT-5, providing an internal mechanism similar to a “router” to intelligently process user requests.
The programming ability of GPT-5 has greatly improved compared to its predecessor; The rate of hallucinations has significantly decreased; In addition to significantly reducing factual errors in answers, GPT-5 also makes judgments and clearly indicates its limitations and inability to complete tasks that are clearly impossible. ‌
Gemini 2.0 Ultra (Google): Native multimodal architecture, deeply integrated with the search ecosystem, suitable for enterprise level knowledge bases and real-time cross modal analysis. ‌‌
DeepSeek-R1 (domestic model): Its mathematical and coding abilities are comparable to GPT-4, and its cost is only 1/70 of a closed source model. It is suitable for the intelligent transformation of small and medium-sized enterprises and the popularization of education.
Mathematics and Programming Fields
Qwen2.5-MAX (Alibaba Cloud): Ranked first globally in mathematics and programming, with outstanding support for multiple languages, suitable for cross-border e-commerce and content creation platforms. ‌‌
Claude 3.7 Sonnet (Anthropic): Processing over 100000 tokens in long context, prioritizing security and compliance, suitable for legal contract parsing and financial risk control report generation. ‌
Image generation model field
The Flux Pro Ultra, developed by Black Forest Labs, is currently the benchmark for high-resolution image generation, with its core advantage being support for 4-megapixel (2048 × 2048) output.
Jimeng AI, with its unique “glyph semantic” joint encoding technology, can accurately process Chinese unique elements such as “calligraphy font watermark” and “ancient style poetry postscript”.
In addition: Recreate V3, Midjournal V7, Gemini 2.0 video module in GPT-Image-1 video generation model field, Wan 2.1 open source model, and Kwai Kering 2.0 or above are based on the current ranking data.
Speaking of personal experience, whether it is good or not mainly depends on one’s own usage scenario. The one that suits oneself is the best.
For example, if it’s free and can also assist with work, that’s great.