Which AI models support function calling in 2026?

All major AI models support function calling (tool use) as of June 2026, including GPT-5, Claude Opus/Sonnet/Haiku, Gemini Pro/Flash, DeepSeek V4, Mistral, Llama 4, Grok, and Cohere Command R. Budget models like GPT-oss 20B and Gemini Flash Lite have more limited function calling support.

Which AI models support vision and image input?

Most flagship models support vision: GPT-5, GPT-4o, Claude Opus/Sonnet, Gemini Pro/Flash, DeepSeek V4, Mistral Large, Grok, and Llama 4 Maverick. Budget models like GPT-4o mini, Gemini Flash Lite, and some smaller open-source models have limited or no vision support.

What is JSON mode and which models support it?

JSON mode ensures the model outputs valid JSON. GPT-5 and GPT-4o have native JSON mode. Claude models can output JSON via structured output or system prompts. Gemini supports JSON mode natively. Most modern LLMs can reliably produce JSON when instructed, but native support varies.

Which AI models have built-in embeddings?

Only Google Gemini models (3.1 Pro, 2.5 Pro, 2.0 Flash, Flash Lite) and Cohere Command R/R+ have built-in embedding endpoints. All other models require separate embedding APIs from providers like OpenAI (text-embedding-3), Cohere, or open-source alternatives.

Which AI models support fine-tuning?

OpenAI offers fine-tuning for GPT-5, GPT-5 mini, GPT-4o, and GPT-4o mini. Google supports fine-tuning for Gemini Pro and Flash models. DeepSeek, Mistral, Cohere, and Meta Llama models also support fine-tuning. Anthropic does not offer fine-tuning for Claude models.