Year in Review
2025: The Year of AI Agents
Reasoning models, agentic systems, and the Claude 4 / GPT-5 era — AI became truly autonomous.
6+
Reasoning Models
o1, o3, Claude thinking
10+
Agent Frameworks
computer use, MCP, skills
2M+
Context Window
tokens standard
2
Model Generations
Claude 4, GPT-5
Anthropic
September
Claude Sonnet 4.5
Best model for complex agents and coding
October
Claude Haiku 4.5
Near-frontier performance at Haiku speed
November
Claude Opus 4.5
Most intelligent model with vision & coding improvements
October
Agent Skills
Extend Claude with custom capabilities and tools
November
Structured Outputs
Guaranteed schema conformance for responses
November
Microsoft Foundry
Claude on Azure with full API support
OpenAI
January
o1 & o1-mini
Reasoning models with chain-of-thought
March
GPT-5
Next generation flagship model
June
o3 & o3-mini
Advanced reasoning with deep research
December
GPT-5.2
Enhanced multimodality and tool calling
December
GPT-5.2-Codex
Advanced coding with long-horizon reasoning
June
Agents SDK
Framework for building AI agents
February
Gemini 2.0 Flash
Agentic features and improved performance
March
Gemini 2.0 Pro
Enhanced reasoning and coding
December
Gemini 3 Flash
Frontier intelligence built for speed
Ongoing
AI Studio Updates
Logs, debugging, and dataset tools
June
Deep Research
AI-powered research assistant
Key Trends of 2025
🧠
Reasoning Models
Chain-of-thought became standard
🤖
Agentic Systems
Computer use, tool calling, autonomous tasks
🔧
Developer Tools
SDKs, MCP, structured outputs
☁️
Cloud Integration
Azure, AWS, GCP native support