Anthropic's reasoning powerhouse vs Google's speed champion. We compare Claude Sonnet 4.5 and Gemini 3 Flash across five coding dimensions to help you pick the right model.
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Task-specific scoring for coding workloads across 5 dimensions.
| Dimension | Claude Sonnet 4.5 | Gemini 3 Flash | Edge |
|---|---|---|---|
| Code Quality | Produces highly idiomatic, well-tested code. Excels at catching edge cases and writing defensive code. | Generates functional code quickly but with less attention to edge cases and error handling. | |
| Debug Accuracy | Traces root causes methodically, even in complex multi-file bugs. Explains reasoning step by step. | Fast at spotting surface-level issues. Less reliable on bugs that require deep reasoning across modules. | |
| Multi-file Refactoring | 200K context handles large refactors well. Maintains type safety and import consistency across files. | 1M-token context lets it see entire large codebases, but refactoring suggestions can be less precise. | |
| API & Tool Integration | Competent tool use. Strong at generating API client code and middleware. | Good with Google Cloud integrations. Fast at generating boilerplate integration code. | tie |
| Test Generation | Comprehensive test suites with edge cases, property-based tests, and thorough mocking strategies. | Generates basic test suites quickly. Less attention to boundary conditions and negative test cases. |
Pick Claude Sonnet 4.5 for code reviews, complex debugging, refactoring, and any coding task where correctness and robustness matter.
Pick Gemini 3 Flash for rapid prototyping, generating boilerplate, quick one-off scripts, and tasks where iteration speed matters more than first-pass quality.
Claude Sonnet 4.5 is the significantly stronger coding model, winning four of five dimensions. Its careful reasoning and edge-case awareness produce more reliable code. Gemini 3 Flash's speed makes it useful for rapid prototyping and boilerplate generation.
Use LLMWise Compare mode to test Claude Sonnet 4.5 vs Gemini 3 Flash on your own coding prompts.
You only pay credits per request. No monthly subscription. Paid credits never expire.
Replace multiple AI subscriptions with one wallet that includes routing, failover, and optimization.