GPT-5.1 OpenAI
Enjoy even more human-like and intelligent conversational AI: GPT-5.1 responds faster, follows your instructions better, adapts its tone to your preferences, and handles complex or creative tasks with natural warmth. Two modes (Instant and Thinking)

Best for
Enjoy even more human-like and intelligent conversational AI: GPT-5.1 responds faster, follows your instructions better, adapts its tone to your preferences, and handles complex or creative tasks with natural warmth. Two modes (Instant and Thinking) » Learn more: ChatGPT Perplexity Tool of the Week Nov 10 – 16, 2025 Verified Tool Freemium 59486 Similar AI Tools GPT-6 Astra Claude Fable 5.1 Claude Fable 5
About GPT-5.1 OpenAI
Enjoy even more human-like and intelligent conversational AI: GPT-5.1 responds faster, follows your instructions better, adapts its tone to your preferences, and handles complex or creative tasks with natural warmth. Two modes (Instant and Thinking)
Alternatives

Claude Opus 5.5
An AI model built for code and autonomous agents. It features a context window of one million tokens and enables detailed analysis of documents, charts, and screenshots. It is 40% less expensive than its predecessor (Opus 5)
An AI model built for code and autonomous agents. It features a context window of one million tokens and enables detailed analysis of documents, charts, and screenshots. It is 40% less expensive than its predecessor (Opus 5) » Learn more: ChatGPT Perplexity Tool of the Week Sep 21 – 27, 2026 Verified Tool Freemium 220257 Similar AI Tools GPT-6 Astra Claude Fable 5.1 GPT‑6.1 Sol

GPT-6 Astra
The OpenAI model capable of operating a computer like a human: filling out forms, managing a CRM, coding, analyzing scientific data, or conducting research. With a context of 1 million tokens
The OpenAI model capable of operating a computer like a human: filling out forms, managing a CRM, coding, analyzing scientific data, or conducting research. With a context of 1 million tokens » Learn more: ChatGPT Perplexity Tool of the Week Aug 25 – 31, 2026 Verified Tool Freemium 218548 Similar AI Tools Claude Fable 5.1 Claude Fable 5 Grok 4.6

Claude Fable 5.1
Anthropic's LLM model for coding, research, and long, complex tasks. With improved performance and reduced costs on agent-based workloads. It also produces far fewer false security alerts
Anthropic's LLM model for coding, research, and long, complex tasks. With improved performance and reduced costs on agent-based workloads. It also produces far fewer false security alerts » Learn more: ChatGPT Perplexity Verified Tool Paid 211777 Similar AI Tools GPT-6 Astra Claude Fable 5 Grok 4.6