Add gemini-3-1-pro-high and gemini-3-1-pro-low to models.generated for google-antigravity

[uniuuu]

Antigravity is deprecating gemini-3-pro-high / gemini-3-pro-low in favor of
gemini-3-1-pro-high / gemini-3-1-pro-low.

These new model IDs are missing from models.generated.js under the google-antigravity
provider, causing downstream tools to show them as missing.

Please add catalog entries mirroring the existing gemini-3-pro-high / gemini-3-pro-low
entries with the updated 3-1 IDs.

[mehmetcanbudak]

Additional Fix Required: Antigravity Version

I confirmed this issue locally with pi v0.55.0. Adding the model IDs alone is not sufficient.

Root Cause

The DEFAULT_ANTIGRAVITY_VERSION in google-gemini-cli.ts is set to 1.15.8, but current Antigravity installs are at 1.107.0.

With the old version header, the API returns:

Gemini 3.1 Pro is not available on this version. Please upgrade to the latest version.

Fix Required

In packages/ai/src/providers/google-gemini-cli.ts, update:

// From:
const DEFAULT_ANTIGRAVITY_VERSION = "1.15.8";

// To:
const DEFAULT_ANTIGRAVITY_VERSION = "1.107.0";

Or better, make it dynamically read from antigravity --version if available.

Workaround (for users)

Set the environment variable:

PI_AI_ANTIGRAVITY_VERSION=1.107.0 pi --provider google-antigravity --model gemini-3.1-pro-high

Verified Working Models

After applying both fixes (model IDs + version):

• gemini-3.1-pro-high ✅
• gemini-3.1-pro-low ✅
• claude-sonnet-4-6 ✅

Deprecated (API returns error):

• gemini-3-pro-high ❌
• gemini-3-pro-low ❌

[yorha59]

I independently ran into the same issue and have a working fix ready.

PR: #1691 (auto-closed due to first-time contributor gate — happy to reopen once approved)

Branch: yorha59:fix/antigravity-gemini-31-support

Changes (3 files, +59 lines)

1. packages/ai/scripts/generate-models.ts — added gemini-3.1-pro-high and gemini-3.1-pro-low to antigravityModels
2. packages/ai/src/models.generated.ts — regenerated with the new model entries
3. packages/ai/src/providers/google-gemini-cli.ts — bumped DEFAULT_ANTIGRAVITY_VERSION from 1.15.8 to 1.18.0

Testing

Verified both models return 200 OK from the sandbox API. Tested in production (OpenClaw) for several days — reasoning, tool use, and streaming all work correctly. Existing models (gemini-3-flash, etc.) remain unaffected.

Note on version: I used 1.18.0 as the minimum UA version that unlocks 3.1 models. The actual latest Antigravity version is 1.107.0 as noted above. Either works — the sandbox accepts any UA ≥ 1.18.0 for Gemini 3.1. Using the latest might be more future-proof.