OpenAI

OpenAI builds the GPT family of models and ChatGPT. In its API, GPT-6 Astra is the flagship model for complex reasoning and coding, and GPT-5.6 Sol, Terra and Luna trade intelligence against cost. It also offers GPT-Image-2.5 for image generation and editing, GPT-Transcribe for speech-to-text, and GPT-Live and GPT-Realtime models for voice. New integrations build on the Responses API; the older Assistants API was shut down on 26 August 2026.

• GPT-6 Astra, the flagship model for complex reasoning and coding
• GPT-5.6 Sol, Terra and Luna to balance intelligence against cost
• 1.05M-token context window on the flagship models
• GPT-Image-2.5 for image generation and editing
• GPT-Transcribe and GPT-Live-Transcribe for speech-to-text
• GPT-Live and GPT-Realtime models for voice conversations
• Responses API with function calling and tool use

• Chatbots and conversational AI
• Content creation and copywriting
• Code generation and debugging
• Document analysis and summarization
• Creative writing and brainstorming
• Language translation
• Image generation and editing
• Voice transcription and analysis

• Anthropic
• Google Gemini
• Cohere
• Hugging Face