v3.9.9 — Refresh Antigravity models: Gemini 3.5 Flash, Claude 4.6, GPT-OSS 120B

CHANGELOG.md

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 # Changelog
 
+## v3.9.9 (2026-05-25)
+
+**Antigravity Model Refresh**
+
+### Updated Models
+- **Gemini 3.5 Flash** (High / Medium) — new flagship flash model
+- **Gemini 3.1 Pro** (High / Low) — tiered reasoning control
+- **Claude Sonnet 4.6 Thinking** — Anthropic partner model via Antigravity
+- **Claude Opus 4.6 Thinking** — Anthropic partner model via Antigravity
+- **GPT-OSS 120B Medium** — open-weight GPT model via Antigravity
+- Removed stale `antigravity-*` prefixed IDs and old preview models
+
+### Proxy Updates
+- Alias map updated for tiered model IDs (high/medium/low/thinking)
+- Context sizes added for all new Antigravity models
+
 ## v3.9.8 (2026-05-25)
 
 **Codex Desktop Model Fix & Global BrokenPipeError Protection**