[diegosouzapw]

Summary

Antigravity's public catalog (ANTIGRAVITY_PUBLIC_MODELS in open-sse/config/antigravityModelAliases.ts) ships these as user-callable client ids:

• gemini-3-flash-agent → "Gemini 3.5 Flash (High)"
• gemini-3.5-flash-low → "Gemini 3.5 Flash (Medium)"
• gemini-pro-agent → "Gemini 3.1 Pro (High)" (v1.23+ Agent mode)

But the ag block in the default pricing table (src/shared/constants/pricing.ts) only carried rows for gemini-3-flash and gemini-3.1-pro-high, so getPricingForModel("ag", id) returned null and downstream cost / quota accounting silently fell back to $0 for those three models.

Seed the missing rows with the per-MTok rates the upstream quota tier bills at:

• Flash High / Medium share the legacy gemini-3-flash rate ($0.50 / $3.00 / $0.03 / $4.50 / $0.50).
• gemini-pro-agent shares the gemini-3.1-pro-high rate ($4.00 / $18.00 / $0.50 / $27.00 / $4.00).

Why surgical, not the full upstream change

Upstream PR (CommonJS fork) also rewrites the Antigravity model registry to swap legacy ids (gemini-3.1-pro-high, gemini-2.5-flash, claude-sonnet-4-5*) for the new ids. OmniRoute already has that work — and far more comprehensively:

• ANTIGRAVITY_PUBLIC_MODELS already lists all three of these ids (open-sse/config/antigravityModelAliases.ts:33,128).
• ANTIGRAVITY_MODEL_ALIASES already maps the legacy → upstream id transitions OmniRoute exposes (gemini-3.5-flash-high → gemini-3-flash-agent, etc.).
• ANTIGRAVITY_PRO_FALLBACK_CHAINS ([agy] gemini-3.1-pro-high returns 400 in v3.8.23 -- upstream ID format changed #3786) already does the per-request gemini-3.1-pro-high → gemini-pro-agent → gemini-3-pro-high fallback the upstream PR was working around statically.
• The mitm MODEL_SYNONYMS / MODEL_PATTERNS that upstream edits do not exist in OmniRoute — its mitm subsystem is structured differently.

The only genuine OmniRoute gap was pricing, so this PR ports just that.

Test plan

• TDD: tests/unit/pricing-ag-flash-tiers.test.ts failed before the seed (TypeError: Cannot read properties of undefined (reading 'input')), passes after — 3/3.
• Full pricing suite: node --import tsx/esm --test tests/unit/pricing-sync.test.ts tests/unit/pricing-route-sources.test.ts tests/unit/pricing-sync-extended.test.ts tests/unit/pricing-cc-anthropic-rates.test.ts tests/unit/t12-pricing-updates.test.ts → 31/31 pass.
• npm run typecheck:core → clean (exit 0).
• npx eslint src/shared/constants/pricing.ts tests/unit/pricing-ag-flash-tiers.test.ts → clean.

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[gemini-code-assist]

Code Review

This pull request adds pricing configurations and corresponding unit tests for the Antigravity Gemini 3.5 Flash and Gemini 3.1 Pro model aliases (gemini-3-flash-agent, gemini-3.5-flash-low, and gemini-pro-agent). The reviewer feedback correctly points out that gemini-3.5-flash-low maps to the upstream ID gemini-3.5-flash-extra-low for downstream calculations, meaning a pricing entry and unit test for gemini-3.5-flash-extra-low are also required to prevent fallback to $0.

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[gemini-code-assist]

The pricing row for the Gemini 3.5 Flash (Low) tier is missing. According to open-sse/config/antigravityModelAliases.ts, the client ID gemini-3.5-flash-low maps to the upstream ID gemini-3.5-flash-extra-low. Since downstream cost and quota accounting are keyed by upstream model IDs, looking up pricing for the Low tier will query gemini-3.5-flash-extra-low, which will return null and silently fall back to $0. Please add a pricing row for gemini-3.5-flash-extra-low as well.

    "gemini-3.5-flash-low": {
      input: 0.5,
      output: 3.0,
      cached: 0.03,
      reasoning: 4.5,
      cache_creation: 0.5,
    },
    "gemini-3.5-flash-extra-low": {
      input: 0.5,
      output: 3.0,
      cached: 0.03,
      reasoning: 4.5,
      cache_creation: 0.5,
    },

[gemini-code-assist]

Add a unit test to verify the pricing for the Gemini 3.5 Flash (Low) tier (gemini-3.5-flash-extra-low).

Suggested change

	test("ag/gemini-3.5-flash-low matches the Gemini 3.5 Flash (Medium) tier", () => {
	const p = getDefaultPricing().ag["gemini-3.5-flash-low"];
	assert.equal(p.input, 0.5);
	assert.equal(p.output, 3.0);
	assert.equal(p.cached, 0.03);
	assert.equal(p.reasoning, 4.5);
	assert.equal(p.cache_creation, 0.5);
	});
	test("ag/gemini-3.5-flash-low matches the Gemini 3.5 Flash (Medium) tier", () => {
	const p = getDefaultPricing().ag["gemini-3.5-flash-low"];
	assert.equal(p.input, 0.5);
	assert.equal(p.output, 3.0);
	assert.equal(p.cached, 0.03);
	assert.equal(p.reasoning, 4.5);
	assert.equal(p.cache_creation, 0.5);
	});
	test("ag/gemini-3.5-flash-extra-low matches the Gemini 3.5 Flash (Low) tier", () => {
	const p = getDefaultPricing().ag["gemini-3.5-flash-extra-low"];
	assert.equal(p.input, 0.5);
	assert.equal(p.output, 3.0);
	assert.equal(p.cached, 0.03);
	assert.equal(p.reasoning, 4.5);
	assert.equal(p.cache_creation, 0.5);
	});