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System prompt reports wrong context window for DeepSeek-V4-Pro (262K instead of 1M) #24119

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System prompt reports wrong context window for DeepSeek-V4-Pro (262K instead of 1M)#24119
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kitlangton

Description

@LordPadas
LordPadas
opened on Apr 24, 2026

Description

When using deepseek-v4-pro, the system prompt tells the model it has a 262K token context window, but the actual model supports 1M tokens (per https://api-docs.deepseek.com/quick_start/pricing).

Plugins

No response

OpenCode version

1.3.0

Steps to reproduce

  1. Configure deepseek-v4-pro as the provider
  2. Ask the model about its context window
  3. It responds with "262K tokens"

Screenshot and/or share link

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Operating System

Windows

Terminal

No response

Activity

  1. LordPadas
    added
    bugSomething isn't working
    on Apr 24, 2026
  2. github-actions
    assigned
    rekram1-node
    on Apr 24, 2026
  3. github-actions
    added
    coreAnything pertaining to core functionality of the application (opencode server stuff)
    on Apr 24, 2026
  4. thdxr
    removed
    bugSomething isn't working
    coreAnything pertaining to core functionality of the application (opencode server stuff)
    on May 3, 2026
  5. thdxr
    assigned
    kitlangton
    and unassigned
    rekram1-node
    on May 3, 2026

  6. rekram1-node commented on Jun 11, 2026

    @rekram1-node
    rekram1-node
    on Jun 11, 2026
    Contributor

    this is not accurate, the system prompt says nothing about context size.

  7. rekram1-node
    closed this as not plannedon Jun 11, 2026
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