OpenAI's Codex product has reached 7 million users, representing more than a 10x increase from approximately 550k-700k users at the start of the year. This rapid growth coincides with the July 9 launch of GPT-5.6 Sol and recent infrastructure updates to manage usage.
- Codex user count grew from ~2M in March to 7M, with 1 million new users added in a single day.
- Prime Intellect released verifiers v1, redesigning its agentic RL environment stack to store rollout traces as message DAGs for O(n) growth.
- Coding agent benchmarks are shifting focus from token price to cost per task, with Devin Fusion using Fable 5 achieving lower costs than Opus 4.8.
- GPT-5.6 Sol ranked #2 on the Arena agent leaderboard based on 7.8K real-world sessions, while OpenAI implemented inference optimizations and context limit rollbacks.
The surge in Codex usage highlights the increasing competition between coding agents, where harness design and cost efficiency are becoming critical differentiators alongside model quality.