fix(cli): support GPT-5.6 Responses Lite for ChatGPT OAuth

[mcartmel]

Summary

Port OpenCode's Responses Lite support for GPT-5.6 Sol, Terra, and Luna to Kilo's OpenAI ChatGPT OAuth provider.

This adapts the request payload, session identity, HTTP headers, and WebSocket metadata required by the Responses Lite contract while preserving the existing Kilo model filtering and refresh behavior.

Testing

• Luna plain text: passed
• Luna tool call: passed
• Luna multi-turn conversation: passed
• Luna fresh conversation: passed
• Luna with experimental WebSockets enabled: passed
• Sol regression: passed
• Terra regression: passed
• GPT-5.4 regression: passed
• Focused tests: 44 passed
• CLI typecheck: passed
• Shared-file annotation guard: passed
• Windows x64 build and smoke tests: passed
• Repository pre-push typechecks: passed

Tested on Windows x64 with OpenAI/ChatGPT OAuth using a local VS Code snapshot extension.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• packages/opencode/src/plugin/openai/codex.ts
• packages/opencode/src/plugin/openai/ws-pool.ts

Previous Review Summary (commit 0ae044d)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 0ae044d)

Status: 3 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	3
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/opencode/src/plugin/openai/codex.ts	724	Synthetic helper session mappings are never released
packages/opencode/src/plugin/openai/codex.ts	742	Required tool-choice semantics are overwritten
packages/opencode/src/plugin/openai/ws-pool.ts	217	Removing a connecting pool entry can leak its socket

Fix these issues in Kilo Cloud

Files Reviewed (5 files)

• .changeset/gpt-56-responses-lite.md - 0 issues
• packages/opencode/src/plugin/openai/codex.ts - 2 issues
• packages/opencode/src/plugin/openai/ws-pool.ts - 1 issue
• packages/opencode/test/plugin/codex.test.ts - 0 issues
• packages/opencode/test/plugin/openai-ws.test.ts - 0 issues

---

_{Reviewed by gpt-5.6-sol-20260709 · Input: 65.6K · Output: 11.5K · Cached: 533.4K}

_{Review guidance: REVIEW.md from base branch main}

[sublimode]

Works! But at least in some cases the stop button doesn't do anything, such as when a multi choice window is dismissed and the stream appears to hang. I then have to reload the window in order to send a new message which would otherwise remain stuck in the queue. I don't know if this is an upstream issue.

[chrarnoldus]

related: anomalyco/opencode#36685

[lambertjosh]

Closing - this works as OpenAI now supports standard responses API for Luna: