[Bug] OpenCode Go MiniMax M2.5/M2.7 return empty content or Missing API Key error

[elsatheassist-crypto]

Description

When using OpenCode Go provider with MiniMax M2.5 or M2.7 models, API requests fail with either empty content or "Missing API Key" error, depending on the endpoint used. The same API key works fine with Kimi K2.5 and GLM-5 on OpenCode Go.

Environment

• OpenCode Go API key (verified working with Kimi K2.5)
• Provider: OpenCode Go
• Models tested: MiniMax M2.5, MiniMax M2.7

Endpoints Tested

1. /v1/chat/completions (OpenAI-compatible)

MiniMax M2.5 & M2.7: HTTP 200, but message.content is empty/null. finish_reason is "length" (indicating tokens were generated but content was not captured). Model returned: MiniMax-M2.5-highspeed for M2.5, MiniMax-M2.7 for M2.7.

Working reference - Kimi K2.5: Same request format, returns visible content correctly.

2. /v1/messages (Anthropic-compatible)

MiniMax M2.5 & M2.7: Returns {"error": {"type": "AuthError", "message": "Missing API key."}}

Same API key with Kimi K2.5 on /v1/chat/completions: Works fine.

Related Issues

• [Bug]: Missing API Key error with OpenCode Go provider (Kimi K2.5) while same API key works with OpenCode Zen #17541: Similar "Missing API Key" with Kimi K2.5 on OpenCode Go
• [OpenCode Go/Zen] MiniMax 2.5 cache caps at ~15k tokens #16743: MiniMax cache cap ~15k on OpenCode Go
• Minimax M2.5 experience is weird #15092: Minimax M2.5 experience is weird
• MiniMax-M2 reasoning content not properly handled in OpenAI-compatible mode, should we support this ? #3555: MiniMax reasoning content format issue in OpenAI-compatible mode

Hypothesis

1. OpenAI endpoint: MiniMax puts reasoning content in </think> tags within content instead of reasoning_content field (MiniMax-M2 reasoning content not properly handled in OpenAI-compatible mode, should we support this ? #3555). OpenCode doesn't parse this, causing empty visible output.

2. Anthropic endpoint: MiniMax expects ANTHROPIC_AUTH_TOKEN header (not Authorization: Bearer) for auth. OpenCode Go doesn't translate the API key correctly for this endpoint.

Expected Behavior

MiniMax M2.5 and M2.7 should return visible content through OpenCode Go, like Kimi K2.5 and GLM-5 do.

[github-actions]

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

• Opencode Go Kimi and Minimax doesn't work #17626: Also reports MiniMax and Kimi not working on OpenCode Go (open)
• Minimax M2.5 experience is weird #15092: Reports strange behavior with MiniMax M2.5 (open)

If your issue covers different root causes or adds new technical detail beyond these, please clarify how it differs.

[elsatheassist-crypto]

Verified this on OpenCode v1.3.7. \n\n- with and now returns correct responses without empty content.\n- The 'Missing API key' error on the /v1/messages endpoint is no longer reproducible.\n\nSince the issue is no longer reproducible in the current environment, I'm closing this.