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Opencode Go/Deepseek V4 flash #33473

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Opencode Go/Deepseek V4 flash#33473
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MrMushrooooom

Description

@tthoele89
tthoele89
opened on Jun 23, 2026

Description

I upgraded to 1.17.8 and was developing all day. when I checked my usage, I am at 25%!! it seems that there were no cache hits, and apparently some kind of bug. I just had my opencode go subcription renew today, only to watch 25 percent disappear.

What do I do next? Is this fixed in 1.17.9?

Plugins

No response

OpenCode version

1.17.8

Steps to reproduce

The bug has been tested in this Reddit thread:

https://www.reddit.com/r/opencodeCLI/comments/1u9grix/opencode_not_using_prompt_caching_with_deepseek/

Every prompt I send costs 160–170K input tokens because the full conversation history gets re-sent each turn with no caching. Tested in a brand new empty folder — even "hello" costs ~8K tokens (that's OpenCode's fixed system prompt + tool definitions overhead, apparently normal). The real problem: after a long session there's zero cache reduction. No "cache read" field in the UI, no cost savings between turns.

DeepSeek V3/V4 supports native prompt caching so the model can do it. The issue seems to be OpenCode not sending cache_control in its API requests.

Screenshot and/or share link

Image Image

Operating System

Debian Trixie

Terminal

Tabby Terminal

Activity

  1. github-actions
    assigned
    MrMushrooooom
    on Jun 23, 2026

  2. github-actions commented on Jun 23, 2026

    @github-actions
    github-actionsBot
    on Jun 23, 2026 – with GitHub Actions
    Contributor

    This issue doesn't fully meet our contributing guidelines.

    What needs to be fixed:

    • Steps to reproduce is empty — please describe what you were doing when you noticed the cache miss behavior (e.g., which model/provider configuration, session length, etc.)
    • OpenCode version is missing — please include the exact version (you mentioned 1.17.8 in the description, add it to the field)
    • Operating System and Terminal fields are empty — system info helps diagnose environment-specific issues

    Please edit this issue to address the above within 2 hours, or it will be automatically closed.

    This issue might be a duplicate of existing issues. Please check:

    If you believe this was flagged incorrectly, please let a maintainer know.

  3. github-actions
    added
    needs:complianceThis means the issue will auto-close after 2 hours.
    and removed
    needs:complianceThis means the issue will auto-close after 2 hours.
    on Jun 23, 2026

  4. github-actions commented on Jun 23, 2026

    @github-actions
    github-actionsBot
    on Jun 23, 2026 – with GitHub Actions
    Contributor

    Thanks for updating the issue! It now includes a clear description, reproduction steps, version info, OS, terminal, and screenshots. Everything looks good — the compliance flag has been removed.

  5. axetroy commented on Jun 30, 2026

    @axetroy
    axetroy
    on Jun 30, 2026
    Image

    A simple self-introduction consumed 9K tokens.

  6. github-actions commented on Aug 30, 2026

    @github-actions
    github-actionsBot
    on Aug 30, 2026 – with GitHub Actions
    Contributor

    To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.

  7. github-actions
    closed this as not plannedon Aug 30, 2026
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