Gemini 4 Argon vs GPT-5.6 Sol
Reading a 26.2K-token pull request costs $0.1048 on GPT-5.6 Sol, 2.0× the $0.0524 it costs on Gemini 4 Argon. Gemini 4 Argon is a mid-range model and GPT-5.6 Sol a frontier one. The benchmark cannot separate their recall: Gemini 4 Argon minus GPT-5.6 Sol is +10 pts (95% interval −5 pts to +25 pts).
Side by side
| Figure | Gemini 4 Argon | GPT-5.6 Sol |
|---|---|---|
| Price tier | Mid-range | Frontier |
| Bugs caughtshare of known bugs | 82% (better) | 72% |
| False alarmsper clean PR | 1.1 (better) | 1.2 |
| Cost per reviewmeasured | $0.0527 (better) | $0.1127 |
| Cost per bug caught | $0.0706 (better) | $0.1732 |
| Exact linecatches on the expected lines | 78% | 92% (better) |
| Review timemean | 99s | 50s (better) |
| Typical review calllist price | $0.0766 (better) | $0.1532 |
| Input / 1M tokens | $2.00 (better) | $4.00 |
| Output / 1M tokens | $10.00 (better) | $20.00 |
| Context window | 1M | 1.1M |
- From 2026-12-01, after a scheduled reprice, the two cost the same.
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 4 Argon | 82% | 83% | 50% | 83% | 75% | 89% | 67% | 100% | 100% | 83% | 100% | 100% | 100% | 0% |
| GPT-5.6 Sol | 72% | 67% | 50% | 69% | 75% | 56% | 100% | 67% | 100% | 100% | 67% | 100% | 50% | 0% |
Of the 42 known bugs both were scored on, both caught 29 and neither caught 3. Gemini 4 Argon caught 7 bugs that GPT-5.6 Sol missed: 2 in TypeScript, 1 in C++, 1 in C#, 1 in Go, 1 in Kotlin and 1 in Ruby, most of them logic bugs. GPT-5.6 Sol caught 3 bugs that Gemini 4 Argon missed: 1 in Go, 1 in JavaScript and 1 in TypeScript.
On pull requests with no known bug, Gemini 4 Argon raised 1.1 false alarms per review and GPT-5.6 Sol 1.2. A measured review cost $0.0527 on Gemini 4 Argon, 53% less than $0.1127 on GPT-5.6 Sol.
| Pull request | Language · kind | Gemini 4 Argon | GPT-5.6 Sol |
|---|---|---|---|
| dotnet/orleansfix(serialization): cap codec allocations | C# · Logic | 1/1 | 0/1 |
| ggml-org/llama.cpprpc : cache and reuse compute graphs | C++ · Security | 1/1 | 0/1 |
| kotest/kotestFix DataClassEq comparator | Kotlin · Logic | 1/1 | 0/1 |
| rails/railsReimplement Action Cable redis adapter with redis-client | Ruby · Logic | 1/1 | 0/1 |
| traefik/traefikAdd the option to define custom cipher suites for backend serversTransport | Go · API misuse | 1/1 | 0/1 |
| trpc/trpcfix(server): pass maxDurationMs timeout signal to subscription handlers | TypeScript · Concurrency | 1/1 | 0/1 |
| withastro/astroPort Go's csrf protection | TypeScript · Logic | 1/1 | 0/1 |
| colinhacks/zodfeat(v4): parse input containing reference cycles | TypeScript · Resource handling | 0/1 | 1/1 |
| golang/gocrypto/tls: add LocalCertificate to ConnectionState | Go · Logic | 0/1 | 1/1 |
| nodejs/undicifeat: add configurable maxPayloadSize for WebSocket | JavaScript · Security | 0/1 | 1/1 |
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 4 Argon and GPT-5.6 Sol.