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OpenCode Go: union-alpha fails with 503 'Upstream request failed: Endpoint is unavailable' on tool calls #49413

Closed as not planned
Closed as not planned
OpenCode Go: union-alpha fails with 503 'Upstream request failed: Endpoint is unavailable' on tool calls#49413
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fwang

Description

@herbertnikolajewskidci
herbertnikolajewskidci
opened on Sep 16, 2026

Description

When using opencode-go/union-alpha, plain prompt requests (without tools) work as expected, but any turn that involves tool calling (e.g. read, write, bash) consistently triggers a 503 Service Unavailable from the provider gateway:

{"type":"error","error":{"type":"api_error","message":"Error from provider (Console Go): Upstream request failed: Endpoint is unavailable."}}

Steps to Reproduce

Tested on OpenCode 1.18.31 (and third-party agents like Pi):

  1. Run plain prompt (succeeds):
curl -s -H "x-api-key: $OPENCODE_GO_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "x-opencode-session: session-test" \
  -H "content-type: application/json" \
  https://opencode.ai/zen/go/v1/messages \
  -d '{"model": "union-alpha", "max_tokens": 50, "messages": [{"role": "user", "content": "Hi"}]}'
# Returns 200 OK
  1. Run request with tools attached or via CLI:
opencode run --model opencode-go/union-alpha "Create a test file test.txt and read it back"

Actual output:

← Write test.txt
Wrote file successfully.
Error: Error from provider (Console Go): Upstream request failed: Endpoint is unavailable.

Environment

Activity

  1. github-actions
    assigned
    fwang
    on Sep 16, 2026

  2. github-actions commented on Sep 16, 2026

    @github-actions
    github-actionsBot
    on Sep 16, 2026 – with GitHub Actions
    Contributor

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

    If your issue is distinct (e.g. specifically affects union-alpha with tool calls in a way not covered by the above), please add clarifying details.

  3. herbertnikolajewskidci commented on Sep 16, 2026

    @herbertnikolajewskidci
    herbertnikolajewskidci
    on Sep 16, 2026
    Author

    Clarification regarding the bot flags:

  4. thdxr commented on Oct 11, 2026

    @thdxr
    thdxr
    on Oct 11, 2026
    Member

    Thanks for the report! OpenCode 2.0 is now out and development is focused on V2, so we're closing issues filed against OpenCode 1. Please upgrade (opencode upgrade --major, details: https://anoma.ly/notes/opencode-2-0), and if this is still relevant on 2.0, reopen this issue or open a new one with your 2.0 version.

    — from 𝕺𝖕𝖊𝖓𝕮𝖔𝖉𝖊

  5. thdxr
    closed this as not plannedon Oct 11, 2026
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