OpenAI Codex hits 7M weekly active users; 10x growth in 6 months outpaces Claude Code reporting

OpenAI's Codex platform reached 7 million weekly active users on July 13, 2026, up from 6 million just 48 hours earlier, according to a tweet from Tibo Sottiaux (OpenAI's product lead). This milestone followed a removal of the 5-hour usage limit for Plus, Business, and Pro plans and the July 9 launch of GPT-5.6 Sol. Codex usage has grown ~10x since early 2026 (starting from ~550k–700k in January to 2 million by March, then 7 million by mid-July).

The acceleration follows the February launch of Codex's desktop application and GPT-5.3 Codex model, which established parity with Anthropic's Claude Opus 4.6 on coding benchmarks and exceeded it by >10% on core coding tasks like Terminal Bench. OpenAI has been aggressively expanding Codex beyond developers: knowledge workers now represent ~20% of users and are growing rapidly, using Codex for reports, spreadsheets, research, and workflow automation. Non-developer users grew 137x since August 2025 among individuals and 189x among organizations.

For practitioners evaluating coding agent platforms, Codex's growth trajectory signals OpenAI's willingness to remove artificial usage caps and invest in cost reduction for frontier models—a competitive move against Claude Code's $2.5B ARR baseline (reported Feb 2026). Teams betting on agent infrastructure should note: cost-per-task, not just model capability, is becoming the metric that wins deals. Codex's 10x user growth in 6 months, combined with removal of usage limits, suggests aggressive capture strategy in agentic workflows.