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.
GPTs
Create custom versions of ChatGPT that combine instructions, extra knowledge, and any combination of skills.
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.
Computer use
An experimental capability lets Claude 3.5 Sonnet operate a computer through the API.
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.
Agent building blocks on the API
The API adds code execution, an MCP connector, file storage and extended prompt caching.
Connectors directory
A directory of tools that connect to Claude, each tried with one click.
ChatGPT agent
ChatGPT can think and act with tools to complete tasks like research, bookings and slideshows.
Apps in ChatGPT and Apps SDK
Users can chat with apps inside ChatGPT; developers build them with the new Apps SDK in preview.
Agent Skills
Claude loads folders of instructions, scripts and resources when relevant to a task.
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.
MCP donated to Agentic AI Foundation
Anthropic donates MCP to the Linux Foundation's new Agentic AI Foundation, co-founded with Block and OpenAI.
2026
MCP Apps
Connectors can show an interactive live UI right inside a Claude conversation.
Agents SDK sandbox execution
The Agents SDK adds native sandbox execution and a model-native harness for long-running agents.
MCP spec with stateless core
The 2026-07-28 MCP spec moves to a stateless core with standard extensions and hardened auth.
Computer use, Skills and Files APIs GA
Computer use, the Skills API and the Files API are generally available, plus a new browser use tool.
Agents API
Managed service on the Codex harness for building cloud agents with long-running sessions and tools.