Gemini 3.5 Flash-Lite vs Gemma 4 26B A4B (Workers AI)
Reading a 26.2K-token pull request costs $0.0079 on Gemini 3.5 Flash-Lite, 3.0× the $0.0026 it costs on Gemma 4 26B A4B (Workers AI). Both sit in the economy price tier, so the choice between them is about review quality more than budget. The benchmark cannot separate their recall: Gemini 3.5 Flash-Lite minus Gemma 4 26B A4B (Workers AI) is −15 pts (95% interval −27 pts to −3 pts).
Side by side
| Figure | Gemini 3.5 Flash-Lite | Gemma 4 26B A4B (Workers AI) |
|---|---|---|
| Price tier | Economy | Economy |
| Bugs caughtshare of known bugs | 11% | 26% (better) |
| False alarmsper clean PR | 0.4 | 0.4 (better) |
| Cost per reviewmeasured | $0.0059 | $0.0048 (better) |
| Cost per bug caught | $0.0528 | $0.0209 (better) |
| Exact linecatches on the expected lines | 83% | 91% (better) |
| Review timemean | 103s (better) | 308s |
| Typical review calllist price | $0.0139 | $0.0033 (better) |
| Input / 1M tokens | $0.30 | $0.10 (better) |
| Output / 1M tokens | $2.50 | $0.30 (better) |
| Context window | 1M | 256K |
Head to head
The known bugs both were scored on, by who caught each in at least one run.
By language
| Model | All | TypeScript6 bugs | Go4 bugs | Java4 bugs | Rust4 bugs | C#3 bugs | JavaScript3 bugs | Kotlin3 bugs | PHP3 bugs | Python3 bugs | Ruby3 bugs | Swift3 bugs | C++2 bugs | C1 bug |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gemini 3.5 Flash-Lite | 11% | 33% | 0% | 5% | 0% | 0% | 0% | 33% | 0% | 17% | 0% | 0% | 50% | 0% |
| Gemma 4 26B A4B (Workers AI) | 26% | 33% | 0% | 30% | 38% | 7% | 0% | 56% | 33% | 44% | 67% | 0% | 0% | 0% |
Of the 42 known bugs both were scored on, both caught 5 and neither caught 25. Gemini 3.5 Flash-Lite caught one bug that Gemma 4 26B A4B (Workers AI) missed: 1 in C++. Gemma 4 26B A4B (Workers AI) caught 11 bugs that Gemini 3.5 Flash-Lite missed: 2 in Kotlin, 2 in Ruby, 2 in Rust, 1 in C#, 1 in Java, 1 in PHP, 1 in Python and 1 in TypeScript.
On pull requests with no known bug, Gemini 3.5 Flash-Lite raised 0.4 false alarms per review and Gemma 4 26B A4B (Workers AI) 0.4. A measured review cost $0.0059 on Gemini 3.5 Flash-Lite, 23% more than $0.0048 on Gemma 4 26B A4B (Workers AI).
| Pull request | Language · kind | Gemini 3.5 Flash-Lite | Gemma 4 26B A4B (Workers AI) |
|---|---|---|---|
| duckdb/duckdbFix vsize = 2 issue in JSON create | C++ · Concurrency | 1/1 | 0/3 |
| MudBlazor/MudBlazorRefactor: MudDebouncedInput, ThrottleDispatcher and DebounceDispatcher | C# · Concurrency | 0/3 | 2/9 |
| denoland/denoperf(libs/core): poll only ready handles and yield between I/O batches | Rust · Concurrency | 0/1 | 2/2 |
| django/djangoFixed #36226 -- Accepted str or bytes for password and salt in password hashers. | Python · Error handling | 0/1 | 2/3 |
| iBotPeaches/Apktoolrefactor: Improve renaming/injection of resources in stripped APKs | Java · Security | 0/1 | 3/3 |
| kotest/kotestFix DataClassEq comparator | Kotlin · Logic | 0/1 | 1/3 |
| ktorio/ktorKTOR-9171 Redesign ByteReadChannel.readUTF8Line API | Kotlin · Logic | 0/1 | 1/3 |
| laravel/framework[12.x] Colocate Container build functions with the `Buildable` interface | PHP · Error handling | 0/1 | 3/3 |
| rack/rackApply bytesize and number of param limits in QueryParser | Ruby · Security | 0/1 | 2/2 |
| rails/railsReimplement Action Cable redis adapter with redis-client | Ruby · Logic | 0/1 | 2/2 |
| rustls/rustlsAffix `Protocol` at top of client handshake | Rust · Logic | 0/1 | 1/2 |
| trpc/trpcfix(server): pass maxDurationMs timeout signal to subscription handlers | TypeScript · Concurrency | 0/1 | 1/2 |
Defects caught over all runs: a PR reviewed three times with one known bug shows 3/3 when it was caught every time.
Every bug each was scored on: Gemini 3.5 Flash-Lite and Gemma 4 26B A4B (Workers AI).