Best GPT-5.1 alternatives
Users seek alternatives to GPT-5.1 to access higher intelligence_index scores, faster output speeds, lower prices per million tokens, or larger context windows while retaining multimodal capabilities. This list covers seven proprietary multimodal models with their documented specs, strengths, and limitations compared to the base model.
Anthropic's Claude Sonnet 4.6 excels at long-context multimodal analysis.
Anthropic's closed multimodal model with a million-token context window.
Google's multimodal preview model with custom tools and massive context handling.
GPT-5.2 Pro shares the 400k context and image/text/file modalities at a much higher $168/1M price with no reported metrics, providing seamless integration but high computational demands.
Multimodal coding model with 400k-token context from OpenAI.
GPT-5.1-Codex achieves a higher intelligence_index of 43.1 and faster speed of 178.06 t/s than GPT-5.1 at the same price and context, specializing in coding with visual integration but limited to text and images.
GPT-5 Codex provides a higher intelligence_index of 44.6 and faster speed of 149.9 t/s than GPT-5.1 at the same $10/1M price and 400k context, with added coding specialization but similar limitations on modalities.
Google's fast multimodal model for unified text, image, audio, and video tasks.
Frequently asked questions
GPT-5 Codex is the strongest by intelligence_index at 44.6, followed by Grok 4.3 at 43.9, both exceeding GPT-5.1's 27.4 while offering competitive speeds and contexts.