Over time, the experience of fast models like Codex-Spark and deeper frontier models like GPT-5.3-Codex will start to blend. You can imagine instant interactions in the foreground, deeper reasoning and sub-agents running in parallel in the background.
@romainhuet
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GPT-5.3-Codex-Spark: Real-Time Coding Model with 1000+ Tokens Per Second
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Hello GPT-5.3-Codex-Spark! ✨
— Romain Huet (@romainhuet) 12 février 2026
Our first real-time coding model. It is… FAST. 1,000+ tokens per second.
Once you experience latency this low, it’s hard to go back. This is an exciting first milestone in our partnership with @Cerebras. pic.twitter.com/ieuDkJ1qLzHello GPT-5.3-Codex-Spark! Our first real-time coding model. It is… FAST. 1,000+ tokens per second. Once you experience latency this low, it’s hard to go back. This is an exciting first milestone in our partnership with @Cerebras
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Codex deployed company-wide at Nvidia for 30k engineers
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Codex just rolled out company-wide at @nvidia to ~30k engineers. Can’t wait to see what @DennisHannusch and everyone there build with it!
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Codex Windows app alpha testing launching end of week
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The Codex team is aiming to start alpha testing of the Windows app end of week! Make sure to sign up for updates here:
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Changelog Updates for Codex: In-App Notes or Web Feed?
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We keep a changelog below for updates across all the places you can use Codex, but it’s easy to miss if you’re mostly in the app! Curious, would in-app release notes help more, or is a web feed like this better?
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Open to Feedback and Curious About Codex Projects
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Love hearing that. Always open to feedback or ideas, and curious what you’re building with Codex!
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What Workflows or Features Would You Like in Codex?
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Curious what workflows or features you miss most that we could bring to Codex?
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Helping Codex Builders Go Deeper: What Would You Find Useful?
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For builders using Codex or exploring it, what could we do to help you go deeper? This could be demos of long-running tasks, production workflows using skills or MCP tools, code review, or anything else you’d find useful. Would love to hear!
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Codex CLI: Real-time Agent Feedback and Steering Capabilities
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When your coding agent runs for hours (or even days!), it becomes critical to give feedback the same way you would to a teammate. Codex CLI now lets you steer the agent and watch it adapt in real time, without breaking the flow. Check it out in /experimental. Feedback welcome!
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Interest in Codex improvements and user feedback
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Love it! Curious how it goes, and what would make Codex even better for you.