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July 26, 2026

AI News for Developers #28: Codex Multi-Agent, Claude Opus 5, and Gemini 3.6 Flash

Hey Devs!

Original on SubstackView on LinkedIn

On this page
  1. OpenAI improves Codex multi-agent workflows
  2. Anthropic releases Claude Opus 5
  3. Google launches Gemini 3.6 Flash
  4. GitHub adds controls for AI agents
  5. Microsoft releases its Agent Framework Harness
  6. Cursor introduces automatic model routing
  7. JetBrains improves context for coding agents
  8. I Tested GPT-5.6 Sol Reasoning Levels So You Don’t Have To

Hey Devs! This week brought new models, better coding agents, and more tools for building reliable AI workflows. Here are the main updates from July 19–26, 2026.

OpenAI improves Codex multi-agent workflows

Codex CLI 0.145.0 improves Multi-Agent V2 with configurable subagent models, reasoning levels, roles, and concurrency.

Codex also adds better imports from Claude Code and Cursor, experimental thread history and memory, audio input, inline visualizations, and multi-folder project support.

This makes it easier to balance speed, cost, and reasoning quality across different agents.

Read the Codex changelog


Anthropic releases Claude Opus 5

Claude Opus 5 is designed for complex coding, debugging, large repositories, and long-running agent tasks.

It includes a 1-million-token context window and configurable effort levels. It is also rolling out in GitHub Copilot.

Read the Anthropic announcement


Google launches Gemini 3.6 Flash

Gemini 3.6 Flash focuses on coding, multimodal applications, computer use, and production AI agents.

Google also introduced Gemini 3.5 Flash-Lite for faster and cheaper high-volume tasks such as classification, extraction, and data processing.

Explore the new Gemini models


GitHub adds controls for AI agents

GitHub Issues can now show an agent’s confidence and reasoning before it applies a change.

Teams can automatically accept high-confidence actions while sending uncertain changes for human review. GitHub also made its Copilot cloud agent integration for Linear generally available.

Read about GitHub’s agent controls


Microsoft releases its Agent Framework Harness

Microsoft’s new framework for Python and .NET includes agent loops, planning, memory, crash recovery, approvals, context management, and observability.

Declarative Workflows 1.0 also allows developers to define agent workflows and approval steps using YAML.

Explore Microsoft Agent Framework


Cursor introduces automatic model routing

Cursor Router automatically selects a suitable model for each request.

Developers can optimize routing for intelligence, balance, or cost. This could reduce the need to manually select a model for every coding task.

View the Cursor changelog


JetBrains improves context for coding agents

JetBrains Context creates a semantic repository index for Claude, Codex, and Junie.

It helps agents find relevant code across one or multiple repositories while potentially reducing agent turns, latency, and cost.

Read the JetBrains announcement


I Tested GPT-5.6 Sol Reasoning Levels So You Don’t Have To

Does higher GPT-5.6 Sol reasoning actually improve your code? See how four different settings affect coding task results and speed.

Watch on YouTube:

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