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Understanding the codex context limit in vs code

Confusion About Codex Context Limits | Users Report Mixed Results

By

Jacob Lin

Oct 9, 2025, 09:52 PM

2 minutes needed to read

A screenshot of VS Code showing the Codex extension analyzing code with a focus on context limits and token usage.

A growing number of developers are raising questions about the context limits in the VS Code Codex extension, with confusion surrounding token usage. Many are reporting inconsistent experiences when working on files that exceed these limits.

User Experiences with Codex Context Limits

Developers are expressing uncertainty about how the Codex extension handles large files. Some reports indicate it can process files exceeding 280,000 tokens while only using around 13,000 tokens. This contradiction has left many wondering whether the latest version of Codex is more efficient compared to its predecessors.

"I’m confused about whether Codex can work in a single file that exceeds its context limit," one developer shared.

Reloading Required for New Chats

In light of these discussions, another developer shared an interesting finding: simply starting a new chat doesn’t clear previous context. To truly refresh the environment, users need to reload the entire VS Code application, suggesting that lingering context could affect performance.

Themes in Feedback

  • Context Limit Confusion: Users are unsure how token usage works, with some suggesting that the context from previous sessions impacts new interactions.

  • Variable Token Efficiency: Developers report fluctuating token consumption, raising concerns about efficiency in handling large files.

  • Technical Solutions: There are hints that reloading VS Code is a necessary step to avoid crossover of context, showing that technical adjustments may be required for optimal performance.

Sentiment and Reactions

Overall, the sentiment appears mixed. While some users appreciate the extension's capabilities, others are frustrated by the inconsistencies.

  • ⚠️ "Reloading is a hassle; it shouldn’t be necessary every time."

  • 🌟 "When it works, Codex is fantastic!"

Key Insights

  • 🎯 Many are unaware that starting a new chat doesn't reset context.

  • πŸ” Reports indicate varying token usage efficiency, leaving users puzzled.

  • ⏱️ Full reload of the application seems necessary for context clarity.

In the fast-paced world of coding and programming, clarity around such tools is essential. As developers continue to share insights, it’s clear that understanding Codex's limitations and capabilities will be crucial for effective use.

Future Expectations Based on Current Feedback

There’s a strong chance that as developers continue to grapple with the context limits in the VS Code Codex extension, updates will roll out to enhance its functionality. Given the mixed reviews and confusion regarding token usage, experts estimate around a 70% probability that the developers behind Codex will prioritize addressing these issues in future releases. Improvements in how the extension manages context from previous interactions and better documentation outlining token efficiency will likely be key focuses, with a view to streamlining the user experience.

An Unlikely Historical Echo

The situation surrounding the Codex context limits shares a surprising similarity with the early days of GPS technology in the late 1990s. Initially, users faced confusion and frustration with inconsistent access to location data. Just like developers navigating the quirks of Codex, early adopters of GPS had to manage overlaps and inaccuracies in their tech, which required patience and adaptation. Over time, continuous improvements led to far more reliable systems. Just as with GPS, the early challenges encountered with Codex could lay the groundwork for a refined, more efficient tool that ultimately rewards developers willing to adapt.