GPT-5.4 Leads Coding Reliability, Kimi K2.5.6 Wins Value
GPT-5.4 is the top default for backend, debugging, and multi-step coding due to its completeness and reliability. Kimi K2.5.6 code offers the best overall value with strong frontend output at lower cost and speed. Opus 4.7 improves but lags on backend; use it in Verdent for better workflows.
GPT-5.4 as Reliable Default for Serious Coding
Pick GPT-5.4 for backend work, debugging, planning, instruction following, tool use, and longer multi-step tasks because it finishes jobs without getting lost, delivering consistent reliability across coding, reasoning, agentic work, computer use, and long context. It outperforms others as the most complete model, making it the safest choice for general and production coding where supervision is minimal.
Avoid it only for frontend if visual taste and UI feel matter more, as competitors edge it out there while remaining solid overall.
Kimi K2.5.6 Code Excels in Frontend and Cost Efficiency
Choose Kimi K2.5.6 code when balancing quality, speed, and cost, especially for frontend tasks like UI generation, landing pages, and components where it produces nicer visual direction than GPT-5.4. Its backend performance is excellent enough to compete, but the real edge comes from being faster, cheaper, and still highly capable—ideal for developers prioritizing value over absolute top performance.
Use it in the native Kimmy CLI for optimal pacing, tool calling, and workflow integration, as third-party wrappers dilute its strengths.
Opus 4.7's Backend Shortcomings and Verdent Fix
Skip Opus 4.7 for messy backend tasks like weird bugs, APIs, refactors, infra, database logic, or multi-file debugging—it overthinks irrelevant details, slows down, and demands excessive supervision despite premium pricing and minor improvements. Frontend output like polished screens is fine but doesn't justify the gaps.
Route Opus 4.7 through Verdent instead of Claude code to unlock parallel tasks, isolated workspaces, better planning, cleaner reviews, and sustained flow without chaos. Verdent mitigates Claude's atrocious 5-hour limits and poor environment, making Opus more usable—but it doesn't elevate the model to top recommendation status.