DeepSeek V4 Pro (Workers AI) vs GLM-5.3 (Workers AI)
DeepSeek V4 Pro (Workers AI) reads a 26.2K-token pull request for $0.0346, 6% less than GLM-5.3 (Workers AI) ($0.0367). Both sit in the mid-range price tier, so the choice between them is about review quality more than budget. The benchmark cannot separate their recall: DeepSeek V4 Pro (Workers AI) minus GLM-5.3 (Workers AI) is −7 pts (95% interval −18 pts to +4 pts).
Side by side
| Figure | DeepSeek V4 Pro (Workers AI) | GLM-5.3 (Workers AI) |
|---|---|---|
| Price tier | Mid-range | Mid-range |
| Bugs caughtshare of known bugs | 54% | 61% (better) |
| False alarmsper clean PR | 2.9 | 1.9 (better) |
| Cost per reviewmeasured | $0.0643 | $0.0311 (better) |
| Cost per bug caught | $0.0872 | $0.0559 (better) |
| Exact linecatches on the expected lines | 89% (better) | 85% |
| Review timemean | 390s | 65s (better) |
| Typical review calllist price | $0.0442 (better) | $0.0473 |
| Input / 1M tokens | $1.32 (better) | $1.40 |
| Output / 1M tokens | $3.96 (better) | $4.40 |
| Context window | 1M | 1M |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DeepSeek V4 Pro (Workers AI) | 54% | 79% | 25% | 49% | 54% | 59% | 17% | 30% | 69% | 72% | 67% | 75% | 38% | 33% |
| GLM-5.3 (Workers AI) | 61% | 78% | 19% | 46% | 73% | 48% | 33% | 72% | 44% | 58% | 67% | 100% | 100% | 67% |
Of the 42 known bugs both were scored on, both caught 32 and neither caught 4. DeepSeek V4 Pro (Workers AI) caught 2 bugs that GLM-5.3 (Workers AI) missed: 1 in PHP and 1 in Ruby. GLM-5.3 (Workers AI) caught 4 bugs that DeepSeek V4 Pro (Workers AI) missed: 1 in Go, 1 in JavaScript, 1 in Rust and 1 in TypeScript.
On pull requests with no known bug, DeepSeek V4 Pro (Workers AI) raised 2.9 false alarms per review and GLM-5.3 (Workers AI) 1.9. A measured review cost $0.0643 on DeepSeek V4 Pro (Workers AI), 2.1× the cost of $0.0311 on GLM-5.3 (Workers AI).
| Pull request | Language · kind | DeepSeek V4 Pro (Workers AI) | GLM-5.3 (Workers AI) |
|---|---|---|---|
| rails/railsReimplement Action Cable redis adapter with redis-client | Ruby · Logic | 2/4 | 0/3 |
| symfony/symfony[Security] Allow multiple OIDC discovery endpoints | PHP · Security | 1/3 | 0/3 |
| colinhacks/zodfeat(v4): parse input containing reference cycles | TypeScript · Resource handling | 0/4 | 1/4 |
| denoland/denoperf(libs/core): poll only ready handles and yield between I/O batches | Rust · Concurrency | 0/4 | 2/3 |
| golang/gocrypto/tls: add LocalCertificate to ConnectionState | Go · Logic | 0/4 | 1/4 |
| pinojs/thread-streamrefactor: replace setTimeout with Atomics.waitAsync | JavaScript · Concurrency | 0/4 | 1/3 |
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: DeepSeek V4 Pro (Workers AI) and GLM-5.3 (Workers AI).