Codex hits 7M users in 48 hours; 10x growth in 6 months

Codex's rapid user acquisition in mid-July 2026 signals a significant shift in the competitive coding-assistant market. The article notes that the growth coincided with OpenAI's removal of usage restrictions and efficiency improvements to GPT 5.6 Sol, which had previously consumed resources at unsustainable rates due to long context windows, subagent spawning, and aggressive reasoning settings. These operational fixes appear to have unlocked usage growth by making the product more economically viable for both the company and users.

The trajectory is notable in comparison to Claude Code, which the article reports had roughly 2M users and $2.5B ARR in February 2026. With Codex now at 7M users, it appears to have moved ahead in raw user count, though the article acknowledges that Claude Code's parent company may have redirected focus to Claude Tag (a Slack-based variant with different usage patterns) and thus may not be reporting comparable metrics. The article notes that benchmarking has shifted from token-based pricing to cost-per-task metrics, suggesting that raw user count alone does not capture the full picture of competitive positioning in coding-agent markets.

Multiple practitioners cited in the article report strong performance from GPT-5.6 Sol for coding and computer-use workflows, including real-world tasks like web design, mobile development, and game creation. The article also mentions that Arena ranked GPT-5.6 Sol at #2 on its agent leaderboard based on 7.8K real-world agentic sessions, with the model showing strong steerability and task success. This competitive strength, combined with the removal of usage restrictions, appears to account for the acceleration in user adoption.