OpenAI: GPT-5.4 Mini

OpenAI: GPT-6.1 Terra

GPT-6.1 Terra is the mid-tier model in OpenAI’s GPT-6.1 series, built for agentic workloads such as multi-step tool use, coding, and computer use. It delivers stronger agent performance than the previous Terra at half the price of GPT-6.1 Sol, with a 1.05M-token context window and up to 128K output tokens.

OpenAI: GPT-4o-mini

GPT-4o mini is OpenAI's newest model after GPT-4 Omni, supporting both text and image inputs with text outputs. As their most advanced small model, it is many multiples more affordable than other recent frontier models, and more than 60% cheaper than GPT-3.5 Turbo. It maintains SOTA intelligence, while being significantly more cost-effective. GPT-4o mini achieves an 82% score on MMLU and presently ranks higher than GPT-4 on chat preferences [common leaderboards](https://arena.lmsys.org/).

OpenAI: GPT-4o

GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and image inputs with text outputs. It maintains the intelligence level of GPT-4 Turbowhile being twice as fast and 50% more cost-effective. GPT-4o also offers improved performance in processing non-English languages and enhanced visual capabilities. For benchmarking against other models, it was briefly called ["im-also-a-good-gpt2-chatbot"](https://twitter.com/LiamFedus/status/1790064963966370209)

OpenAI: GPT-6.1 Sol

GPT-6.1 Sol is a production-grade OpenAI model designed for agentic workloads, optimized for long-horizon and multi-step tasks such as continuous tool use, complex coding, computer use, and professional workflows. It delivers capabilities approaching GPT-6 Astra at significantly lower cost, including especially low cached-input pricing that makes it well suited for reusable-context agent systems and enterprise deployment scenarios.

OpenAI: GPT-6 Luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks, and at higher reasoning effort it can take on complex software engineering and computer-use tasks that previously called for a Sol-tier model. It shares the GPT-6 family's gains in factual reliability and its clearer, more concise communication style.

OpenAI: GPT-6 Sol

GPT-6 Sol is the cost-efficient high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra and above the fast GPT-6 Luna tier. It is suited for demanding professional work, agentic coding, business workflow automation, and computer use, and is particularly strong at long-horizon software engineering tasks in real codebases. It approaches Astra-level factual reliability at a much lower cost and shares Astra's clearer, more concise communication style in technical and coding conversations.