WebGPT
GPT-3 fine-tuned to answer open-ended questions more accurately using a text-based web browser.
2021
2023
ChatGPT plugins
ChatGPT gets initial plugin support to access up-to-date information, run computations, or use third-party services.
Function calling in the API
API models gain function calling, are more steerable, support longer context, and come at lower prices.
Claude 2.1
Adds a 200K token context window, 2x fewer false statements than Claude 2.0, system prompts and beta tool use.
2024
Tool use generally available
Claude 3 models can call external tools and APIs, now generally available on the Messages API.
Structured Outputs in the API
API model outputs now reliably adhere to developer-supplied JSON Schemas.
Analysis tool in Claude.ai
Claude can write and run JavaScript in Claude.ai for data analysis.
Model Context Protocol (MCP)
An open standard for connecting AI assistants to the systems where data and tools live.
2025
New tools for building agents
OpenAI releases new developer tools for building agents on its platform.
o3 and o4-mini
OpenAI's smartest and most capable models at release, with full tool access.
Integrations
Claude connects to apps and tools via Integrations; Research also searches connected services.
Web search on the API
Developers can give Claude web search with citations through the API.
ChatGPT agent
ChatGPT can think and act with tools to complete tasks like research, bookings and slideshows.
GPT-5.1 in the API
GPT-5.1 reaches the API with adaptive reasoning, extended prompt caching, and apply_patch and shell tools.
Structured outputs
API responses are guaranteed to match JSON schemas and tool definitions; beta for Sonnet 4.5 and Opus 4.1.
Advanced tool use
Claude can discover, learn and execute tools dynamically on the Claude Developer Platform.
2026
GPT-5.4
Frontier model for professional work with stronger coding, computer use, tool search and 1M-token context.
GPT-5.4 mini and nano
Smaller, faster GPT-5.4 versions for coding, tool use and high-volume API and sub-agent workloads.
Agents SDK sandbox execution
The Agents SDK adds native sandbox execution and a model-native harness for long-running agents.
GPT-5.5
A model built for complex tasks like coding, research and data analysis across tools.
Voice mode on Opus, Sonnet and Haiku
Voice mode now runs on the main Claude models, uses connected tools and speaks more languages.
Agents API
Managed service on the Codex harness for building cloud agents with long-running sessions and tools.
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