Which Model for Which Use Case?
Code Generation
Sonnet 4.6 delivers fast, accurate code generation at 80% lower cost. It handles complex codebases, refactoring, and multi-file generation with ease — making it the clear winner for development workloads.
Complex Analysis
Opus excels at nuanced reasoning, deep multi-step analysis, and handling ambiguity in complex documents. For legal analysis, research synthesis, or strategic reasoning, Opus-class quality still matters.
Chatbots & RAG
Sonnet 4.6 provides excellent conversational quality and retrieval-augmented generation at a fraction of Opus's cost. For production chatbots and RAG pipelines, the quality-to-cost ratio is unbeatable.
Creative Writing
Depends on quality needs. Opus produces more nuanced, literary prose for premium creative work. Sonnet 4.6 handles high-volume content creation, marketing copy, and routine writing at scale.
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Frequently Asked Questions
Is Sonnet 4.6 significantly cheaper than Claude 4 Opus?
Yes, Sonnet 4.6 is 80% cheaper on both input and output. Claude 4 Opus costs $15.00/M input and $75.00/M output. Sonnet 4.6 costs $3.00/M input and $15.00/M output. Both models have the same 200K token context window. For a typical workload of 1M input + 500K output tokens/month, Sonnet 4.6 costs $10.50 vs Claude 4 Opus's $52.50 — an 80% savings.
Is the quality difference between Opus and Sonnet 4.6 noticeable?
Opus excels at complex reasoning, nuanced analysis, and long-form generation. Sonnet 4.6 is excellent for most tasks including code generation, chatbots, RAG pipelines, and content creation. The quality gap between the two has narrowed significantly with Sonnet 4.6 — it handles the vast majority of production workloads at a fraction of the cost. Opus-class models are only necessary for the most demanding reasoning and creative tasks.
What happened when Claude 4 Opus was retired on June 15?
Since June 15, 2026, Claude 4 Opus API calls return 410 Gone errors. Migration options: (1) Sonnet 4.6 ($3/$15) — 80% cheaper, same context, stays in the Anthropic ecosystem. (2) Claude Opus 4.8 ($5/$25) — premium quality, 1M context, 67% cheaper than old Opus. (3) GPT-5 ($1.25/$10) — 92% cheaper, 272K context.
When should I stick with Opus-class models vs downgrading to Sonnet?
Opus-class models are worth it for: legal analysis, complex multi-step reasoning, nuanced creative writing, and research synthesis where quality is paramount. Sonnet 4.6 is the better choice for: code generation, chatbots, RAG pipelines, content creation, and most production workloads where excellent quality at 80% lower cost is the priority.
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