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claude-code - 💡(How to fix) Fix Bug: image >2000px crashes entire turn (not just rejected upload) [1 participants]

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anthropics/claude-code#52874•Fetched 2026-04-25 06:18:34
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Error Message

  1. Error "An image in the conversation exceeds the dimension limit for many-image requests (2000px)"
  2. EVERY subsequent message in same session fails with same error — even text-only

Error Messages/Logs

  1. Send the message — API returns error:
  2. Every subsequent turn fails with the same error — the session is permanently blocked Screenshots of the error attached.

Fix Action

Fix / Workaround

Actual: entire session is stuck. Only workaround is starting a brand-new session, losing all prior context — painful on long technical work sessions where rebuilding context takes significant time.

Code Example

An image in the conversation exceeds the dimension limit for many-image requests (2000px)
RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Bug: image >2000px crashes entire turn (not just rejected upload)

Repro:

  1. Paste screenshot >2000px in Claude Code chat
  2. Error "An image in the conversation exceeds the dimension limit for many-image requests (2000px)"
  3. EVERY subsequent message in same session fails with same error — even text-only

Platform: Claude Code CLI on Windows 11 Model: Opus 4.7

What Should Happen?

reject the oversized image, let conversation continue Actual: whole session blocked until restart, losing context

Impact: forces new session + full context reload every time. On long technical sessions this is painful.

Suggestion: strip/downscale oversized image automatically, or at minimum allow follow-up messages without re-sending the offending image.

Error Messages/Logs

An image in the conversation exceeds the dimension limit for many-image requests (2000px)

Steps to Reproduce

  1. Open a chat session in Claude Desktop (Windows 11, Opus 4.7 model)
  2. Paste or attach a screenshot/image with height or width greater than 2000px
  3. Send the message — API returns error: "An image in the conversation exceeds the dimension limit for many-image requests (2000px). Start a new session with fewer images."
  4. Try to send ANY follow-up message in the same session, even plain text with no image
  5. Every subsequent turn fails with the same error — the session is permanently blocked

Expected: the oversized image is rejected (or auto-downscaled), but the conversation continues normally.

Actual: entire session is stuck. Only workaround is starting a brand-new session, losing all prior context — painful on long technical work sessions where rebuilding context takes significant time.

Suggestion: either auto-downscale images above 2000px client-side before sending, or drop the offending image from the conversation history so follow-up messages can proceed.

Screenshots of the error attached.

<img width="740" height="259" alt="Image" src="https://github.com/user-attachments/assets/77dd2e11-28ab-4985-a360-94b2260b69e2" />

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude Code CLI on Windows 11

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

The issue can be mitigated by either auto-downscaling images above 2000px client-side before sending or dropping the offending image from the conversation history to allow follow-up messages to proceed.

Guidance

  • Verify that the error occurs consistently when sending images larger than 2000px in any dimension.
  • Test if sending plain text messages without any images after the initial error still results in the same error message.
  • Consider implementing client-side image resizing to ensure images are below the 2000px limit before sending.
  • If possible, investigate server-side configurations or API parameters that might allow for more flexible image handling or error recovery.

Example

No specific code example can be provided without knowing the exact API or programming language used, but a general approach might involve checking image dimensions before upload and resizing if necessary:

from PIL import Image

# Example function to resize an image if it exceeds 2000px
def resize_image_if_necessary(image_path):
    img = Image.open(image_path)
    width, height = img.size
    if width > 2000 or height > 2000:
        # Resize the image to fit within 2000px while maintaining aspect ratio
        max_dim = 2000
        scale = min(max_dim / width, max_dim / height)
        new_size = (int(width * scale), int(height * scale))
        img = img.resize(new_size)
        img.save(image_path)
    return image_path

Notes

The provided solution is speculative without direct access to the Claude Code API or its documentation. The actual implementation would depend on the specific requirements and constraints of the API and the development environment.

Recommendation

Apply a workaround by implementing client-side image resizing to prevent images larger than 2000px from being sent, as this seems to be the most direct way to mitigate the issue without waiting for a potential fix from the API side.

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claude-code - 💡(How to fix) Fix Bug: image >2000px crashes entire turn (not just rejected upload) [1 participants]