fix(opencode-go): add GPT-6 Luna support for Opencode Go provider

[AntzCode]

Related GitHub Issue

Closes: #1979

Description

Opencode Go only provides GPT models 5.6 and above via the Responses API. It does not support legacy Chat Completions API. This was fixed by #1431, however that issue only targeted gpt-5.6-luna.

The latest version gpt-6-luna is not configured to use the Responses API, so falls back to Chat Completions. This causes a 400 error response from Opencode Go.

This PR adds configuration for gpt-6-luna so that it is routed via Responses api instead of chat/completions.

Test Procedure

In the Zoo Code Providers tab, configure Opencode Go with an API key and create a new model using gpt-6-luna. Observe the following configuration:

• Context Window: 1,050,000 tokens
• Max output: 128,000 tokens
• (y) Supports Images
• (y) Supports prompt caching
• Input price: $0.10 / 1M tokens
• Output price: $0.50 / 1M tokens
• Cache reads price: $0.01 / 1M tokens
• Cache writes price: $0.13 / 1M tokens
• Max Tokens is a slider up to 128000

Use this model and submit a prompt. You should see a successful response.

Pre-Submission Checklist

• [ * ] Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• [ * ] Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• [ * ] Self-Review: I have performed a thorough self-review of my code.
• [ * ] Testing: New and/or updated tests have been added to cover my changes (if applicable).
• [ n/a ] Visual Snapshot (UI changes only): If a user would notice this change at a glance (layout, theme tokens, brand elements, empty/error states), I've added or updated a *.visual.tsx snapshot in webview-ui/. See webview-ui/AGENTS.md → "When a UI change needs a snapshot".
• [ n/a ] Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• [ * ] Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

N/A - inline comments only

Get in Touch

Discord: anthony_25019

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• src/api/providers/__tests__/opencode-go.spec.ts

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🔇 Additional comments (1)

src/api/providers/__tests__/opencode-go.spec.ts (1)

995-995: LGTM!

Also applies to: 997-997

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📝 Summary

Summary by CodeRabbit

• New Features
  • Added support for the gpt-6-luna model, with a 1,050,000-token context window and 128,000-token output limit.
  • The model supports image input, prompt caching, and configurable reasoning effort, with medium as the default.
  • Added model pricing, including adjusted rates for usage beyond 272,000 context tokens.
  • Requests to gpt-6-luna now use the Responses API.

📝 Summary

📝 Summary

Walkthrough

The OpenCode Go registry now includes gpt-6-luna metadata and classifies the model for the Responses API. Provider tests cover its metadata, live limit overrides, and request routing.

Changes

OpenCode Go gpt-6-luna support

Layer / File(s)	Summary
Register model metadata packages/types/src/providers/opencode-go.ts, packages/types/src/__tests__/opencode-go.test.ts, src/api/providers/fetchers/__tests__/opencode-go.spec.ts	The curated registry adds gpt-6-luna limits, capabilities, reasoning settings, and pricing. Tests cover the metadata and verify that live limits override curated limits while curated capabilities and pricing remain.
Route requests through Responses API packages/types/src/providers/opencode-go.ts, src/api/providers/opencode-go.ts, src/api/providers/__tests__/opencode-go.spec.ts	The Responses-format model set includes gpt-6-luna. Tests cover streaming and completePrompt requests through responses.create. Provider documentation identifies both Luna models as using the Responses endpoint.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

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Merge Risk: ⚪ Minimal · up to 4a5e2

The curated defaults are present, and both request flows use the Responses API. Live provider limits may take precedence as designed; no actionable merge risk is evident.

Pre-merge checks | 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Linked Issues check		Issue [#1979] requires gpt-6-luna to use Opencode Go successfully with correct model defaults. The PR adds gpt-6-luna metadata with a 1,050,000-token context window, 128,000 max tokens, image and …
Out of Scope Changes check		The changes stay within issue [#1979]. The registry entry, Responses-format classification, handler documentation, fetcher behavior, and automated tests directly support gpt-6-luna on Opencode Go. N…
Regression Evidence		Focused coverage exists for all changed behavior. Registry tests assert gpt-6-luna metadata, pricing, and Responses classification. Fetcher tests cover both absent live metadata and live limit overr…
Security Boundaries		PASS. The changed source adds static metadata for gpt-6-luna and adds its exact ID to the Responses-format allowlist. Routing uses set membership, and the fetcher validates model entries with Zod be…
Persistence Integrity		PASS: The pull request changes only the in-memory opencodeGoModels registry, the Responses-format model set, handler documentation, and tests. It does not add or modify a persistence read/write path…
Lifecycle Resource Cleanup		No lifecycle cleanup failure is introduced. The production diff adds gpt-6-luna to the model registry and Responses routing set; it does not add listeners, timers, watchers, or tasks. The activated …
Title check		The title clearly identifies the provider and the primary change: adding GPT-6 Luna support for OpenCode Go.
Description check		The description includes the linked issue, implementation rationale, test procedure, checklist, documentation impact, and reviewer contact. It directly matches the changes and objectives. It does not …

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/api/providers/__tests__/opencode-go.spec.ts:
- Line 995: In the gpt-6-luna test, store the result of
collectStream(handler.createMessage("sys", messages)) and assert that it
contains the expected text chunk with type "text" and text "Hello".

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