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Request Entity Too Large error when using GitHub Copilot model around ~70k tokens #14064

Closed as duplicate
Closed as duplicate
Request Entity Too Large error when using GitHub Copilot model around ~70k tokens#14064
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rekram1-node
Labels
bugSomething isn't workingcoreAnything pertaining to core functionality of the application (opencode server stuff)

Description

@cesarfr2002
cesarfr2002
opened on Feb 18, 2026

Description

When using a GitHub Copilot model (Claude Sonnet 4.6) in OpenCode, I consistently get a "Request Entity Too Large" error once the conversation/context reaches approximately 70k tokens.

It seems like the request payload exceeds a limit, possibly due to accumulated conversation history or how the request body is being constructed.

Plugins

none

OpenCode version

1.2.6

Steps to reproduce

  1. Select a GitHub Copilot model (Claude Sonnet 4.6).
  2. Start a normal conversation and keep interacting.
  3. Allow the context to grow (large conversation history).
  4. Once the total context reaches approximately ~70k tokens, send another message.
  5. The request fails with "Request Entity Too Large".

Screenshot and/or share link

Image

Operating System

Cachyos 6.19.0-2

Terminal

kitty

Activity

  1. cesarfr2002
    added
    bugSomething isn't working
    on Feb 18, 2026
  2. github-actions
    assigned
    rekram1-node
    on Feb 18, 2026
  3. github-actions
    added
    coreAnything pertaining to core functionality of the application (opencode server stuff)
    on Feb 18, 2026

  4. github-actions commented on Feb 18, 2026

    @github-actions
    github-actionsBot
    on Feb 18, 2026 – with GitHub Actions
    Contributor

    This issue might be a duplicate of existing issues related to "Request Entity Too Large" errors. Please check:

    These issues share similar symptoms of request payload size limits being exceeded. Please verify if this is a distinct issue or if it relates to one of the above.

  5. cesarfr2002 commented on Feb 18, 2026

    @cesarfr2002
    cesarfr2002
    on Feb 18, 2026
    Author

    Confirmed this is a duplicate of #6574. Closing.

  6. cesarfr2002
    closed this as a duplicateof Request entity too large error #6574 on Feb 18, 2026
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