diff --git a/scripts/ai-review/review.js b/scripts/ai-review/review.js
index cafc7dc..c0aef07 100644
--- a/scripts/ai-review/review.js
+++ b/scripts/ai-review/review.js
@@ -20,7 +20,7 @@ const { buildFileReviewPrompt, buildSummaryPrompt } = require('./prompt')
 // ─── Configuration ─────────────────────────────────────────────────
 
 const GEMINI_API_KEY = process.env.GEMINI_API_KEY
-const MODEL = 'gemini-2.0-flash'
+const MODEL = 'gemini-2.5-flash'
 const MAX_DIFF_PER_FILE = 15000        // chars per file diff
 const MAX_FILES_TO_REVIEW = 15         // max files per run
 const CONCURRENCY = 3                  // parallel Gemini calls
diff --git a/src/lib/__tests__/solana.test.ts b/src/lib/__tests__/solana.test.ts
new file mode 100644
index 0000000..84fa4c2
--- /dev/null
+++ b/src/lib/__tests__/solana.test.ts
@@ -0,0 +1,63 @@
+import { describe, it, expect } from 'vitest'
+import { isValidSolanaAddress, isSolNative, NATIVE_SOL_MINT } from '../solana'
+
+// ─── isValidSolanaAddress ─────────────────────────────────────────
+
+describe('isValidSolanaAddress', () => {
+  it('accepts valid Solana public keys', () => {
+    // System program
+    expect(isValidSolanaAddress('11111111111111111111111111111111')).toBe(true)
+    // Token program
+    expect(isValidSolanaAddress('TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA')).toBe(true)
+    // Random valid base58
+    expect(isValidSolanaAddress('So11111111111111111111111111111111111111111')).toBe(true)
+  })
+
+  it('rejects empty string', () => {
+    expect(isValidSolanaAddress('')).toBe(false)
+  })
+
+  it('rejects EVM addresses', () => {
+    expect(isValidSolanaAddress('0x1234567890abcdef1234567890abcdef12345678')).toBe(false)
+  })
+
+  it('rejects random strings', () => {
+    expect(isValidSolanaAddress('not-a-solana-address')).toBe(false)
+    expect(isValidSolanaAddress('hello world')).toBe(false)
+  })
+
+  it('rejects addresses with invalid base58 characters', () => {
+    // 0, O, I, l are not in base58
+    expect(isValidSolanaAddress('0OIl')).toBe(false)
+  })
+})
+
+// ─── isSolNative ──────────────────────────────────────────────────
+
+describe('isSolNative', () => {
+  it('identifies NATIVE_SOL_MINT', () => {
+    expect(isSolNative(NATIVE_SOL_MINT)).toBe(true)
+  })
+
+  it('identifies system program address', () => {
+    expect(isSolNative('11111111111111111111111111111111')).toBe(true)
+  })
+
+  it('identifies empty string as native', () => {
+    expect(isSolNative('')).toBe(true)
+  })
+
+  it('identifies "native" keyword', () => {
+    expect(isSolNative('native')).toBe(true)
+  })
+
+  it('rejects SPL token addresses', () => {
+    expect(isSolNative('EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v')).toBe(false) // USDC
+    expect(isSolNative('TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA')).toBe(false)
+  })
+
+  it('rejects random strings', () => {
+    expect(isSolNative('sol')).toBe(false)
+    expect(isSolNative('SOL')).toBe(false)
+  })
+})